Merge branch 'master' into 7.0

# Conflicts:
#	src/parser/index.js

README.md

@@ -27,6 +27,12 @@ Significant diversions are expected to occur in the future such as streaming, EB
 
 ### `babylon.parse(code, [options])`
 
+### `babylon.parseExpression(code, [options])`
+
+`parse()` parses the provided `code` as an entire ECMAScript program, while
+`parseExpression()` tries to parse a single Expression with performance in
+mind. When in doubt, use `.parse()`.
+
 ### Options
 
 - **allowImportExportEverywhere**: By default, `import` and `export`
@@ -37,15 +43,19 @@ Significant diversions are expected to occur in the future such as streaming, EB
   the top level raises an error. Set this to `true` to accept such
   code.
 
-- **allowSuperOutsideMethod** TODO
+- **allowSuperOutsideMethod**: TODO
 
 - **sourceType**: Indicate the mode the code should be parsed in. Can be
   either `"script"` or `"module"`.
 
 - **sourceFilename**: Correlate output AST nodes with their source filename.  Useful when generating code and source maps from the ASTs of multiple input files.
 
+- **startLine**: By default, the first line of code parsed is treated as line 1. You can provide a line number to alternatively start with. Useful for integration with other source tools.
+
 - **plugins**: Array containing the plugins that you want to enable.
 
+- **strictMode**: TODO
+
 ### Output
 
 Babylon generates AST according to [Babel AST format][].

src/index.js

@@ -11,8 +11,10 @@ import { types as tokTypes } from "./tokenizer/types";
 import "./tokenizer";
 import "./tokenizer/context";
 
+import estreePlugin from "./plugins/estree";
 import flowPlugin from "./plugins/flow";
 import jsxPlugin from "./plugins/jsx";
+plugins.estree = estreePlugin;
 plugins.flow = flowPlugin;
 plugins.jsx = jsxPlugin;
 

src/options.js

@@ -4,6 +4,7 @@
 export const defaultOptions: {
   sourceType: string,
   sourceFilename: any,
+  startLine: number,
   allowReturnOutsideFunction: boolean,
   allowImportExportEverywhere: boolean,
   allowSuperOutsideMethod: boolean,
@@ -14,6 +15,9 @@ export const defaultOptions: {
   sourceType: "script",
   // Source filename.
   sourceFilename: undefined,
+  // Line from which to start counting source. Useful for
+  // integration with other tools.
+  startLine: 1,
   // When enabled, a return at the top level is not considered an
   // error.
   allowReturnOutsideFunction: false,

src/parser/expression.js

@@ -343,7 +343,7 @@ pp.parseCallExpressionArguments = function (close, possibleAsyncArrow) {
       innerParenStart = this.state.start;
     }
 
-    elts.push(this.parseExprListItem(undefined, possibleAsyncArrow ? { start: 0 } : undefined));
+    elts.push(this.parseExprListItem(false, possibleAsyncArrow ? { start: 0 } : undefined, possibleAsyncArrow ? { start: 0 } : undefined));
   }
 
   // we found an async arrow function so let's not allow any inner parens
@@ -735,8 +735,9 @@ pp.parseObj = function (isPattern, refShorthandDefaultPos) {
     }
 
     if (this.hasPlugin("objectRestSpread") && this.match(tt.ellipsis)) {
-      prop = this.parseSpread();
+      prop = this.parseSpread(isPattern ? { start: 0 } : undefined);
       prop.type = isPattern ? "RestProperty" : "SpreadProperty";
+      if (isPattern) this.toAssignable(prop.argument, true, "object pattern");
       node.properties.push(prop);
       if (isPattern) {
         const position = this.state.start;
@@ -773,6 +774,7 @@ pp.parseObj = function (isPattern, refShorthandDefaultPos) {
       const asyncId = this.parseIdentifier();
       if (this.match(tt.colon) || this.match(tt.parenL) || this.match(tt.braceR) || this.match(tt.eq) || this.match(tt.comma)) {
         prop.key = asyncId;
+        prop.computed = false;
       } else {
         isAsync = true;
         if (this.hasPlugin("asyncGenerators")) isGenerator = this.eat(tt.star);
@@ -1019,14 +1021,14 @@ pp.parseExprList = function (close, allowEmpty, refShorthandDefaultPos) {
   return elts;
 };
 
-pp.parseExprListItem = function (allowEmpty, refShorthandDefaultPos) {
+pp.parseExprListItem = function (allowEmpty, refShorthandDefaultPos, refNeedsArrowPos) {
   let elt;
   if (allowEmpty && this.match(tt.comma)) {
     elt = null;
   } else if (this.match(tt.ellipsis)) {
     elt = this.parseSpread(refShorthandDefaultPos);
   } else {
-    elt = this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem);
+    elt = this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem, refNeedsArrowPos);
   }
   return elt;
 };
@@ -1037,14 +1039,13 @@ pp.parseExprListItem = function (allowEmpty, refShorthandDefaultPos) {
 
 pp.parseIdentifier = function (liberal) {
   const node = this.startNode();
+  if (!liberal) {
+    this.checkReservedWord(this.state.value, this.state.start, !!this.state.type.keyword, false);
+  }
 
   if (this.match(tt.name)) {
-    if (!liberal) {
-      this.checkReservedWord(this.state.value, this.state.start, false, false);
-    }
-
     node.name = this.state.value;
-  } else if (liberal && this.state.type.keyword) {
+  } else if (this.state.type.keyword) {
     node.name = this.state.type.keyword;
   } else {
     this.unexpected();

src/parser/index.js

@@ -46,6 +46,12 @@ export default class Parser extends Tokenizer {
       pluginList.push("flow");
     }
 
+    if (pluginList.indexOf("estree") >= 0) {
+      // ensure estree plugin loads first
+      pluginList = pluginList.filter((plugin) => plugin !== "estree");
+      pluginList.unshift("estree");
+    }
+
     for (const name of pluginList) {
       if (!pluginMap[name]) {
         pluginMap[name] = true;

src/parser/statement.js

@@ -1059,7 +1059,12 @@ pp.parseImportSpecifiers = function (node) {
 pp.parseImportSpecifier = function (node) {
   const specifier = this.startNode();
   specifier.imported = this.parseIdentifier(true);
-  specifier.local = this.eatContextual("as") ? this.parseIdentifier() : specifier.imported.__clone();
+  if (this.eatContextual("as")) {
+    specifier.local = this.parseIdentifier();
+  } else {
+    this.checkReservedWord(specifier.imported.name, specifier.start, true, true);
+    specifier.local = specifier.imported.__clone();
+  }
   this.checkLVal(specifier.local, true, undefined, "import specifier");
   node.specifiers.push(this.finishNode(specifier, "ImportSpecifier"));
 };

src/plugins/estree.js

@@ -0,0 +1,242 @@
+import { types as tt } from "../tokenizer/types";
+import Parser from "../parser";
+
+const pp = Parser.prototype;
+
+pp.estreeParseRegExpLiteral = function ({ pattern, flags }) {
+  let regex = null;
+  try {
+    regex = new RegExp(pattern, flags);
+  } catch (e) {
+    // In environments that don't support these flags value will
+    // be null as the regex can't be represented natively.
+  }
+  const node = this.estreeParseLiteral(regex);
+  node.regex = { pattern, flags };
+
+  return node;
+};
+
+pp.estreeParseLiteral = function (value) {
+  const node = this.parseLiteral(value, "Literal");
+  node.raw = node.extra.raw;
+  delete node.extra;
+
+  return node;
+};
+
+pp.directiveToStmt = function (directive) {
+  const directiveLiteral = directive.value;
+
+  const stmt = this.startNodeAt(directive.start, directive.loc.start);
+  const expression = this.startNodeAt(directiveLiteral.start, directiveLiteral.loc.start);
+
+  expression.value = directiveLiteral.value;
+  expression.raw = directiveLiteral.extra.raw;
+
+  stmt.expression = this.finishNodeAt(expression, "Literal", directiveLiteral.end, directiveLiteral.loc.end);
+  stmt.directive = directiveLiteral.extra.raw.slice(1, -1);
+
+  return this.finishNodeAt(stmt, "ExpressionStatement", directive.end, directive.loc.end);
+};
+
+function isSimpleProperty(node) {
+  return node &&
+    node.type === "Property" &&
+    node.kind === "init" &&
+    node.method === false;
+}
+
+export default function (instance) {
+  instance.extend("checkDeclaration", function(inner) {
+    return function (node) {
+      if (isSimpleProperty(node)) {
+        this.checkDeclaration(node.value);
+      } else {
+        inner.call(this, node);
+      }
+    };
+  });
+
+  instance.extend("checkGetterSetterParamCount", function() {
+    return function (prop) {
+      const paramCount = prop.kind === "get" ? 0 : 1;
+      if (prop.value.params.length !== paramCount) {
+        const start = prop.start;
+        if (prop.kind === "get") {
+          this.raise(start, "getter should have no params");
+        } else {
+          this.raise(start, "setter should have exactly one param");
+        }
+      }
+    };
+  });
+
+  instance.extend("checkLVal", function(inner) {
+    return function (expr, isBinding, checkClashes, ...args) {
+      switch (expr.type) {
+        case "ObjectPattern":
+          expr.properties.forEach((prop) => {
+            this.checkLVal(
+              prop.type === "Property" ? prop.value : prop,
+              isBinding,
+              checkClashes,
+              "object destructuring pattern"
+            );
+          });
+          break;
+        default:
+          inner.call(this, expr, isBinding, checkClashes, ...args);
+      }
+    };
+  });
+
+  instance.extend("checkPropClash", function () {
+    return function (prop, propHash) {
+      if (prop.computed || !isSimpleProperty(prop)) return;
+
+      const key = prop.key;
+      // It is either an Identifier or a String/NumericLiteral
+      const name = key.type === "Identifier" ? key.name : String(key.value);
+
+      if (name === "__proto__") {
+        if (propHash.proto) this.raise(key.start, "Redefinition of __proto__ property");
+        propHash.proto = true;
+      }
+    };
+  });
+
+  instance.extend("isStrictBody", function () {
+    return function (node, isExpression) {
+      if (!isExpression && node.body.body.length > 0) {
+        for (const directive of (node.body.body: Array<Object>)) {
+          if (directive.type === "ExpressionStatement" && directive.expression.type === "Literal") {
+            if (directive.expression.value === "use strict") return true;
+          } else {
+            // Break for the first non literal expression
+            break;
+          }
+        }
+      }
+
+      return false;
+    };
+  });
+
+  instance.extend("isValidDirective", function () {
+    return function (stmt) {
+      return stmt.type === "ExpressionStatement" &&
+        stmt.expression.type === "Literal" &&
+        typeof stmt.expression.value === "string" &&
+        (!stmt.expression.extra || !stmt.expression.extra.parenthesized);
+    };
+  });
+
+  instance.extend("parseBlockBody", function (inner) {
+    return function (node, ...args) {
+      inner.call(this, node, ...args);
+
+      node.directives.reverse().forEach((directive) => {
+        node.body.unshift(this.directiveToStmt(directive));
+      });
+      delete node.directives;
+    };
+  });
+
+  instance.extend("parseClassMethod", function (inner) {
+    return function (classBody, ...args) {
+      inner.call(this, classBody, ...args);
+
+      const body = classBody.body;
+      body[body.length - 1].type = "MethodDefinition";
+    };
+  });
+
+  instance.extend("parseExprAtom", function(inner) {
+    return function (...args) {
+      switch (this.state.type) {
+        case tt.regexp:
+          return this.estreeParseRegExpLiteral(this.state.value);
+
+        case tt.num:
+        case tt.string:
+          return this.estreeParseLiteral(this.state.value);
+
+        case tt._null:
+          return this.estreeParseLiteral(null);
+
+        case tt._true:
+          return this.estreeParseLiteral(true);
+
+        case tt._false:
+          return this.estreeParseLiteral(false);
+
+        default:
+          return inner.call(this, ...args);
+      }
+    };
+  });
+
+  instance.extend("parseMethod", function(inner) {
+    return function (node, ...args) {
+      let funcNode = this.startNode();
+      funcNode.kind = node.kind; // provide kind, so inner method correctly sets state
+      funcNode = inner.call(this, funcNode, ...args);
+      delete funcNode.kind;
+      node.value = this.finishNode(funcNode, "FunctionExpression");
+
+      return node;
+    };
+  });
+
+  instance.extend("parseObjectMethod", function(inner) {
+    return function (...args) {
+      const node = inner.call(this, ...args);
+
+      if (node) {
+        if (node.kind === "method") node.kind = "init";
+        node.type = "Property";
+      }
+
+      return node;
+    };
+  });
+
+  instance.extend("parseObjectProperty", function(inner) {
+    return function (...args) {
+      const node = inner.call(this, ...args);
+
+      if (node) {
+        node.kind = "init";
+        node.type = "Property";
+      }
+
+      return node;
+    };
+  });
+
+  instance.extend("toAssignable", function(inner) {
+    return function (node, isBinding, ...args) {
+      if (isSimpleProperty(node)) {
+        this.toAssignable(node.value, isBinding, ...args);
+
+        return node;
+      } else if (node.type === "ObjectExpression") {
+        node.type = "ObjectPattern";
+        for (const prop of (node.properties: Array<Object>)) {
+          if (prop.kind === "get" || prop.kind === "set") {
+            this.raise(prop.key.start, "Object pattern can't contain getter or setter");
+          } else if (prop.method) {
+            this.raise(prop.key.start, "Object pattern can't contain methods");
+          } else {
+            this.toAssignable(prop, isBinding, "object destructuring pattern");
+          }
+        }
+
+        return node;
+      }
+
+      return inner.call(this, node, isBinding, ...args);
+    };
+  });
+}

src/plugins/flow.js

@@ -28,6 +28,45 @@ pp.flowParseTypeInitialiser = function (tok) {
   return type;
 };
 
+pp.flowParsePredicate = function() {
+  const node = this.startNode();
+  const moduloLoc = this.state.startLoc;
+  const moduloPos = this.state.start;
+  this.expect(tt.modulo);
+  const checksLoc = this.state.startLoc;
+  this.expectContextual("checks");
+  // Force '%' and 'checks' to be adjacent
+  if (moduloLoc.line !== checksLoc.line || moduloLoc.column !== checksLoc.column - 1) {
+    this.raise(moduloPos, "Spaces between ´%´ and ´checks´ are not allowed here.");
+  }
+  if (this.eat(tt.parenL)) {
+    node.expression = this.parseExpression();
+    this.expect(tt.parenR);
+    return this.finishNode(node, "DeclaredPredicate");
+  } else {
+    return this.finishNode(node, "InferredPredicate");
+  }
+};
+
+pp.flowParseTypeAndPredicateInitialiser = function () {
+  const oldInType = this.state.inType;
+  this.state.inType = true;
+  this.expect(tt.colon);
+  let type = null;
+  let predicate = null;
+  if (this.match(tt.modulo)) {
+    this.state.inType = oldInType;
+    predicate = this.flowParsePredicate();
+  } else {
+    type = this.flowParseType();
+    this.state.inType = oldInType;
+    if (this.match(tt.modulo)) {
+      predicate = this.flowParsePredicate();
+    }
+  }
+  return [type, predicate];
+};
+
 pp.flowParseDeclareClass = function (node) {
   this.next();
   this.flowParseInterfaceish(node, true);
@@ -53,9 +92,10 @@ pp.flowParseDeclareFunction = function (node) {
   typeNode.params = tmp.params;
   typeNode.rest = tmp.rest;
   this.expect(tt.parenR);
-  typeNode.returnType = this.flowParseTypeInitialiser();
+  let predicate = null;
-
+  [typeNode.returnType, predicate] = this.flowParseTypeAndPredicateInitialiser();
   typeContainer.typeAnnotation = this.finishNode(typeNode, "FunctionTypeAnnotation");
+  typeContainer.predicate = predicate;
   id.typeAnnotation = this.finishNode(typeContainer, "TypeAnnotation");
 
   this.finishNode(id, id.type);
@@ -531,7 +571,7 @@ pp.reinterpretTypeAsFunctionTypeParam = function (type) {
 
 pp.flowParseFunctionTypeParams = function (params = []) {
   const ret = { params, rest: null };
-  while (this.match(tt.name)) {
+  while (!this.match(tt.parenR) && !this.match(tt.ellipsis)) {
     ret.params.push(this.flowParseFunctionTypeParam());
     if (!this.match(tt.parenR)) {
       this.expect(tt.comma);
@@ -791,6 +831,12 @@ pp.flowParseTypeAnnotation = function () {
   return this.finishNode(node, "TypeAnnotation");
 };
 
+pp.flowParseTypeAndPredicateAnnotation = function () {
+  const node = this.startNode();
+  [node.typeAnnotation, node.predicate] = this.flowParseTypeAndPredicateInitialiser();
+  return this.finishNode(node, "TypeAnnotation");
+};
+
 pp.flowParseTypeAnnotatableIdentifier = function () {
   const ident = this.flowParseRestrictedIdentifier();
   if (this.match(tt.colon)) {
@@ -833,7 +879,7 @@ export default function (instance) {
       if (this.match(tt.colon) && !allowExpression) {
         // if allowExpression is true then we're parsing an arrow function and if
         // there's a return type then it's been handled elsewhere
-        node.returnType = this.flowParseTypeAnnotation();
+        node.returnType = this.flowParseTypeAndPredicateAnnotation();
       }
 
       return inner.call(this, node, allowExpression);
@@ -1045,9 +1091,9 @@ export default function (instance) {
   // parse an item inside a expression list eg. `(NODE, NODE)` where NODE represents
   // the position where this function is called
   instance.extend("parseExprListItem", function (inner) {
-    return function (allowEmpty, refShorthandDefaultPos) {
+    return function (...args) {
       const container = this.startNode();
-      const node = inner.call(this, allowEmpty, refShorthandDefaultPos);
+      const node = inner.call(this, ...args);
       if (this.match(tt.colon)) {
         container._exprListItem = true;
         container.expression = node;
@@ -1220,9 +1266,10 @@ export default function (instance) {
         specifierTypeKind = "typeof";
       }
 
+      let isBinding = false;
       if (this.isContextual("as")) {
         const as_ident = this.parseIdentifier(true);
-        if (specifierTypeKind !== null && !this.match(tt.name)) {
+        if (specifierTypeKind !== null && !this.match(tt.name) && !this.state.type.keyword) {
           // `import {type as ,` or `import {type as }`
           specifier.imported = as_ident;
           specifier.importKind = specifierTypeKind;
@@ -1231,23 +1278,20 @@ export default function (instance) {
           // `import {type as foo`
           specifier.imported = firstIdent;
           specifier.importKind = null;
-          specifier.local = this.parseIdentifier(false);
+          specifier.local = this.parseIdentifier();
         }
-      } else if (specifierTypeKind !== null && this.match(tt.name)) {
+      } else if (specifierTypeKind !== null && (this.match(tt.name) || this.state.type.keyword)) {
         // `import {type foo`
         specifier.imported = this.parseIdentifier(true);
         specifier.importKind = specifierTypeKind;
-        specifier.local =
+        if (this.eatContextual("as")) {
-          this.eatContextual("as")
+          specifier.local = this.parseIdentifier();
-          ? this.parseIdentifier(false)
+        } else {
-          : specifier.imported.__clone();
+          isBinding = true;
-      } else {
+          specifier.local = specifier.imported.__clone();
-        if (firstIdent.name === "typeof") {
-          this.unexpected(
-            firstIdentLoc,
-            "Cannot import a variable named `typeof`"
-          );
         }
+      } else {
+        isBinding = true;
         specifier.imported = firstIdent;
         specifier.importKind = null;
         specifier.local = specifier.imported.__clone();
@@ -1260,6 +1304,8 @@ export default function (instance) {
         this.raise(firstIdentLoc, "`The `type` and `typeof` keywords on named imports can only be used on regular `import` statements. It cannot be used with `import type` or `import typeof` statements`");
       }
 
+      if (isBinding) this.checkReservedWord(specifier.local.name, specifier.start, true, true);
+
       this.checkLVal(specifier.local, true, undefined, "import specifier");
       node.specifiers.push(this.finishNode(specifier, "ImportSpecifier"));
     };
@@ -1377,7 +1423,7 @@ export default function (instance) {
         try {
           const oldNoAnonFunctionType = this.state.noAnonFunctionType;
           this.state.noAnonFunctionType = true;
-          const returnType = this.flowParseTypeAnnotation();
+          const returnType = this.flowParseTypeAndPredicateAnnotation();
           this.state.noAnonFunctionType = oldNoAnonFunctionType;
 
           if (this.canInsertSemicolon()) this.unexpected();

src/tokenizer/state.js

@@ -34,7 +34,7 @@ export default class State {
     this.commentStack     = [];
 
     this.pos = this.lineStart = 0;
-    this.curLine = 1;
+    this.curLine = options.startLine;
 
     this.type = tt.eof;
     this.value = null;

test/estree-throws.js

@@ -0,0 +1,5 @@
+import path from "path";
+import { runThrowTestsWithEstree } from "./utils/runFixtureTests";
+import { parse } from "../lib";
+
+runThrowTestsWithEstree(path.join(__dirname, "fixtures"), parse);

test/fixtures/core/categorized/startline-specified/actual.js

@@ -0,0 +1,2 @@
+call(1);
+run(2);

test/fixtures/core/categorized/startline-specified/expected.json

@@ -0,0 +1,459 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 16,
+  "loc": {
+    "start": {
+      "line": 3,
+      "column": 0
+    },
+    "end": {
+      "line": 4,
+      "column": 7
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 16,
+    "loc": {
+      "start": {
+        "line": 3,
+        "column": 0
+      },
+      "end": {
+        "line": 4,
+        "column": 7
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 8,
+        "loc": {
+          "start": {
+            "line": 3,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 8
+          }
+        },
+        "expression": {
+          "type": "CallExpression",
+          "start": 0,
+          "end": 7,
+          "loc": {
+            "start": {
+              "line": 3,
+              "column": 0
+            },
+            "end": {
+              "line": 3,
+              "column": 7
+            }
+          },
+          "callee": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 4,
+            "loc": {
+              "start": {
+                "line": 3,
+                "column": 0
+              },
+              "end": {
+                "line": 3,
+                "column": 4
+              },
+              "identifierName": "call"
+            },
+            "name": "call"
+          },
+          "arguments": [
+            {
+              "type": "NumericLiteral",
+              "start": 5,
+              "end": 6,
+              "loc": {
+                "start": {
+                  "line": 3,
+                  "column": 5
+                },
+                "end": {
+                  "line": 3,
+                  "column": 6
+                }
+              },
+              "extra": {
+                "rawValue": 1,
+                "raw": "1"
+              },
+              "value": 1
+            }
+          ]
+        }
+      },
+      {
+        "type": "ExpressionStatement",
+        "start": 9,
+        "end": 16,
+        "loc": {
+          "start": {
+            "line": 4,
+            "column": 0
+          },
+          "end": {
+            "line": 4,
+            "column": 7
+          }
+        },
+        "expression": {
+          "type": "CallExpression",
+          "start": 9,
+          "end": 15,
+          "loc": {
+            "start": {
+              "line": 4,
+              "column": 0
+            },
+            "end": {
+              "line": 4,
+              "column": 6
+            }
+          },
+          "callee": {
+            "type": "Identifier",
+            "start": 9,
+            "end": 12,
+            "loc": {
+              "start": {
+                "line": 4,
+                "column": 0
+              },
+              "end": {
+                "line": 4,
+                "column": 3
+              },
+              "identifierName": "run"
+            },
+            "name": "run"
+          },
+          "arguments": [
+            {
+              "type": "NumericLiteral",
+              "start": 13,
+              "end": 14,
+              "loc": {
+                "start": {
+                  "line": 4,
+                  "column": 4
+                },
+                "end": {
+                  "line": 4,
+                  "column": 5
+                }
+              },
+              "extra": {
+                "rawValue": 2,
+                "raw": "2"
+              },
+              "value": 2
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  },
+  "comments": [],
+  "tokens": [
+    {
+      "type": {
+        "label": "name",
+        "beforeExpr": false,
+        "startsExpr": true,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null
+      },
+      "value": "call",
+      "start": 0,
+      "end": 4,
+      "loc": {
+        "start": {
+          "line": 3,
+          "column": 0
+        },
+        "end": {
+          "line": 3,
+          "column": 4
+        }
+      }
+    },
+    {
+      "type": {
+        "label": "(",
+        "beforeExpr": true,
+        "startsExpr": true,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null
+      },
+      "start": 4,
+      "end": 5,
+      "loc": {
+        "start": {
+          "line": 3,
+          "column": 4
+        },
+        "end": {
+          "line": 3,
+          "column": 5
+        }
+      }
+    },
+    {
+      "type": {
+        "label": "num",
+        "beforeExpr": false,
+        "startsExpr": true,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null,
+        "updateContext": null
+      },
+      "value": 1,
+      "start": 5,
+      "end": 6,
+      "loc": {
+        "start": {
+          "line": 3,
+          "column": 5
+        },
+        "end": {
+          "line": 3,
+          "column": 6
+        }
+      }
+    },
+    {
+      "type": {
+        "label": ")",
+        "beforeExpr": false,
+        "startsExpr": false,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null
+      },
+      "start": 6,
+      "end": 7,
+      "loc": {
+        "start": {
+          "line": 3,
+          "column": 6
+        },
+        "end": {
+          "line": 3,
+          "column": 7
+        }
+      }
+    },
+    {
+      "type": {
+        "label": ";",
+        "beforeExpr": true,
+        "startsExpr": false,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null,
+        "updateContext": null
+      },
+      "start": 7,
+      "end": 8,
+      "loc": {
+        "start": {
+          "line": 3,
+          "column": 7
+        },
+        "end": {
+          "line": 3,
+          "column": 8
+        }
+      }
+    },
+    {
+      "type": {
+        "label": "name",
+        "beforeExpr": false,
+        "startsExpr": true,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null
+      },
+      "value": "run",
+      "start": 9,
+      "end": 12,
+      "loc": {
+        "start": {
+          "line": 4,
+          "column": 0
+        },
+        "end": {
+          "line": 4,
+          "column": 3
+        }
+      }
+    },
+    {
+      "type": {
+        "label": "(",
+        "beforeExpr": true,
+        "startsExpr": true,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null
+      },
+      "start": 12,
+      "end": 13,
+      "loc": {
+        "start": {
+          "line": 4,
+          "column": 3
+        },
+        "end": {
+          "line": 4,
+          "column": 4
+        }
+      }
+    },
+    {
+      "type": {
+        "label": "num",
+        "beforeExpr": false,
+        "startsExpr": true,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null,
+        "updateContext": null
+      },
+      "value": 2,
+      "start": 13,
+      "end": 14,
+      "loc": {
+        "start": {
+          "line": 4,
+          "column": 4
+        },
+        "end": {
+          "line": 4,
+          "column": 5
+        }
+      }
+    },
+    {
+      "type": {
+        "label": ")",
+        "beforeExpr": false,
+        "startsExpr": false,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null
+      },
+      "start": 14,
+      "end": 15,
+      "loc": {
+        "start": {
+          "line": 4,
+          "column": 5
+        },
+        "end": {
+          "line": 4,
+          "column": 6
+        }
+      }
+    },
+    {
+      "type": {
+        "label": ";",
+        "beforeExpr": true,
+        "startsExpr": false,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null,
+        "updateContext": null
+      },
+      "start": 15,
+      "end": 16,
+      "loc": {
+        "start": {
+          "line": 4,
+          "column": 6
+        },
+        "end": {
+          "line": 4,
+          "column": 7
+        }
+      }
+    },
+    {
+      "type": {
+        "label": "eof",
+        "beforeExpr": false,
+        "startsExpr": false,
+        "rightAssociative": false,
+        "isLoop": false,
+        "isAssign": false,
+        "prefix": false,
+        "postfix": false,
+        "binop": null,
+        "updateContext": null
+      },
+      "start": 16,
+      "end": 16,
+      "loc": {
+        "start": {
+          "line": 4,
+          "column": 7
+        },
+        "end": {
+          "line": 4,
+          "column": 7
+        }
+      }
+    }
+  ]
+}

test/fixtures/core/categorized/startline-specified/options.json

@@ -0,0 +1,3 @@
+{
+  "startLine": 3
+}

test/fixtures/es2015/modules/import-invalid-keyword-flow/actual.js

@@ -0,0 +1 @@
+import { default } from "foo";

test/fixtures/es2015/modules/import-invalid-keyword-flow/options.json

@@ -0,0 +1,4 @@
+{
+  "plugins": ["flow"],
+  "throws": "default is a reserved word (1:9)"
+}

test/fixtures/es2015/modules/import-invalid-keyword-typeof-flow/actual.js

@@ -0,0 +1 @@
+import { typeof } from "foo";

test/fixtures/es2015/modules/import-invalid-keyword-typeof-flow/options.json

@@ -0,0 +1,4 @@
+{
+  "plugins": ["flow"],
+  "throws": "typeof is a reserved word (1:9)"
+}

test/fixtures/es2015/modules/import-invalid-keyword-typeof/actual.js

@@ -0,0 +1 @@
+import { typeof } from "foo";

test/fixtures/es2015/modules/import-invalid-keyword-typeof/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "typeof is a reserved word (1:9)"
+}

test/fixtures/es2015/modules/import-invalid-keyword/actual.js

@@ -0,0 +1 @@
+import { debugger } from "foo";

test/fixtures/es2015/modules/import-invalid-keyword/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "debugger is a reserved word (1:9)"
+}

test/fixtures/esprima/es2015-yield/invalid-yield-generator-declaration/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:26)"
+  "throws": "yield is a reserved word (1:26)"
 }

test/fixtures/esprima/es2015-yield/invalid-yield-generator-function-declaration/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:25)"
+  "throws": "yield is a reserved word (1:25)"
 }

test/fixtures/esprima/es2015-yield/invalid-yield-generator-strict-function-expression/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:46)"
+  "throws": "yield is a reserved word (1:46)"
 }

test/fixtures/esprima/es2015-yield/invalid-yield-strict-identifier/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:29)"
+  "throws": "yield is a reserved word (1:29)"
 }

test/fixtures/esprima/es2015-yield/invalid-yield-strict-rest-parameter/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token (1:28)"
+  "throws": "yield is a reserved word (1:28)"
 }

test/fixtures/estree/class-method/basic/actual.js

@@ -0,0 +1,3 @@
+class A {
+  foo() {}
+}

test/fixtures/estree/class-method/basic/expected.json

@@ -0,0 +1,154 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 22,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 22,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "ClassDeclaration",
+        "start": 0,
+        "end": 22,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 6,
+          "end": 7,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 6
+            },
+            "end": {
+              "line": 1,
+              "column": 7
+            },
+            "identifierName": "A"
+          },
+          "name": "A"
+        },
+        "superClass": null,
+        "body": {
+          "type": "ClassBody",
+          "start": 8,
+          "end": 22,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 8
+            },
+            "end": {
+              "line": 3,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "MethodDefinition",
+              "start": 12,
+              "end": 20,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 10
+                }
+              },
+              "computed": false,
+              "key": {
+                "type": "Identifier",
+                "start": 12,
+                "end": 15,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 5
+                  },
+                  "identifierName": "foo"
+                },
+                "name": "foo"
+              },
+              "static": false,
+              "kind": "method",
+              "value": {
+                "type": "FunctionExpression",
+                "start": 15,
+                "end": 20,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 5
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 10
+                  }
+                },
+                "id": null,
+                "generator": false,
+                "async": false,
+                "params": [],
+                "body": {
+                  "type": "BlockStatement",
+                  "start": 18,
+                  "end": 20,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 8
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 10
+                    }
+                  },
+                  "body": []
+                },
+                "expression": false
+              }
+            }
+          ]
+        }
+      }
+    ]
+  }
+}

test/fixtures/estree/directives/block/actual.js

@@ -0,0 +1,5 @@
+function foo() {
+  "use strict";
+  var a = 1;
+  "use strict";
+}

test/fixtures/estree/directives/block/expected.json

@@ -0,0 +1,218 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 63,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 5,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 63,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 5,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 63,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 5,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 9,
+          "end": 12,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 9
+            },
+            "end": {
+              "line": 1,
+              "column": 12
+            },
+            "identifierName": "foo"
+          },
+          "name": "foo"
+        },
+        "generator": false,
+        "expression": false,
+        "async": false,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 15,
+          "end": 63,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 15
+            },
+            "end": {
+              "line": 5,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "ExpressionStatement",
+              "start": 19,
+              "end": 32,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 15
+                }
+              },
+              "expression": {
+                "type": "Literal",
+                "start": 19,
+                "end": 31,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 14
+                  }
+                },
+                "value": "use strict",
+                "raw": "\"use strict\""
+              },
+              "directive": "use strict"
+            },
+            {
+              "type": "VariableDeclaration",
+              "start": 35,
+              "end": 45,
+              "loc": {
+                "start": {
+                  "line": 3,
+                  "column": 2
+                },
+                "end": {
+                  "line": 3,
+                  "column": 12
+                }
+              },
+              "declarations": [
+                {
+                  "type": "VariableDeclarator",
+                  "start": 39,
+                  "end": 44,
+                  "loc": {
+                    "start": {
+                      "line": 3,
+                      "column": 6
+                    },
+                    "end": {
+                      "line": 3,
+                      "column": 11
+                    }
+                  },
+                  "id": {
+                    "type": "Identifier",
+                    "start": 39,
+                    "end": 40,
+                    "loc": {
+                      "start": {
+                        "line": 3,
+                        "column": 6
+                      },
+                      "end": {
+                        "line": 3,
+                        "column": 7
+                      },
+                      "identifierName": "a"
+                    },
+                    "name": "a"
+                  },
+                  "init": {
+                    "type": "Literal",
+                    "start": 43,
+                    "end": 44,
+                    "loc": {
+                      "start": {
+                        "line": 3,
+                        "column": 10
+                      },
+                      "end": {
+                        "line": 3,
+                        "column": 11
+                      }
+                    },
+                    "value": 1,
+                    "raw": "1"
+                  }
+                }
+              ],
+              "kind": "var"
+            },
+            {
+              "type": "ExpressionStatement",
+              "start": 48,
+              "end": 61,
+              "loc": {
+                "start": {
+                  "line": 4,
+                  "column": 2
+                },
+                "end": {
+                  "line": 4,
+                  "column": 15
+                }
+              },
+              "expression": {
+                "type": "Literal",
+                "start": 48,
+                "end": 60,
+                "loc": {
+                  "start": {
+                    "line": 4,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 4,
+                    "column": 14
+                  }
+                },
+                "value": "use strict",
+                "raw": "\"use strict\""
+              }
+            }
+          ]
+        }
+      }
+    ]
+  }
+}

test/fixtures/estree/directives/function-non-strict/actual.js

@@ -0,0 +1,4 @@
+function foo () {
+  "use smth"
+  1+1;
+}

test/fixtures/estree/directives/function-non-strict/expected.json

@@ -0,0 +1,184 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 39,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 4,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 39,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 4,
+        "column": 1
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 39,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 4,
+            "column": 1
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 9,
+          "end": 12,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 9
+            },
+            "end": {
+              "line": 1,
+              "column": 12
+            },
+            "identifierName": "foo"
+          },
+          "name": "foo"
+        },
+        "generator": false,
+        "expression": false,
+        "async": false,
+        "params": [],
+        "body": {
+          "type": "BlockStatement",
+          "start": 16,
+          "end": 39,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 16
+            },
+            "end": {
+              "line": 4,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "ExpressionStatement",
+              "start": 20,
+              "end": 30,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 12
+                }
+              },
+              "expression": {
+                "type": "Literal",
+                "start": 20,
+                "end": 30,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 12
+                  }
+                },
+                "value": "use smth",
+                "raw": "\"use smth\""
+              },
+              "directive": "use smth"
+            },
+            {
+              "type": "ExpressionStatement",
+              "start": 33,
+              "end": 37,
+              "loc": {
+                "start": {
+                  "line": 3,
+                  "column": 2
+                },
+                "end": {
+                  "line": 3,
+                  "column": 6
+                }
+              },
+              "expression": {
+                "type": "BinaryExpression",
+                "start": 33,
+                "end": 36,
+                "loc": {
+                  "start": {
+                    "line": 3,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 3,
+                    "column": 5
+                  }
+                },
+                "left": {
+                  "type": "Literal",
+                  "start": 33,
+                  "end": 34,
+                  "loc": {
+                    "start": {
+                      "line": 3,
+                      "column": 2
+                    },
+                    "end": {
+                      "line": 3,
+                      "column": 3
+                    }
+                  },
+                  "value": 1,
+                  "raw": "1"
+                },
+                "operator": "+",
+                "right": {
+                  "type": "Literal",
+                  "start": 35,
+                  "end": 36,
+                  "loc": {
+                    "start": {
+                      "line": 3,
+                      "column": 4
+                    },
+                    "end": {
+                      "line": 3,
+                      "column": 5
+                    }
+                  },
+                  "value": 1,
+                  "raw": "1"
+                }
+              }
+            }
+          ]
+        }
+      }
+    ]
+  }
+}

test/fixtures/estree/directives/program/actual.js

@@ -0,0 +1,3 @@
+"use strict";
+var a = 1;
+"use strict";

test/fixtures/estree/directives/program/expected.json

@@ -0,0 +1,165 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 38,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 13
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 38,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 13
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "expression": {
+          "type": "Literal",
+          "start": 0,
+          "end": 12,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 12
+            }
+          },
+          "value": "use strict",
+          "raw": "\"use strict\""
+        },
+        "directive": "use strict"
+      },
+      {
+        "type": "VariableDeclaration",
+        "start": 14,
+        "end": 24,
+        "loc": {
+          "start": {
+            "line": 2,
+            "column": 0
+          },
+          "end": {
+            "line": 2,
+            "column": 10
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 18,
+            "end": 23,
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 4
+              },
+              "end": {
+                "line": 2,
+                "column": 9
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 18,
+              "end": 19,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 4
+                },
+                "end": {
+                  "line": 2,
+                  "column": 5
+                },
+                "identifierName": "a"
+              },
+              "name": "a"
+            },
+            "init": {
+              "type": "Literal",
+              "start": 22,
+              "end": 23,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 8
+                },
+                "end": {
+                  "line": 2,
+                  "column": 9
+                }
+              },
+              "value": 1,
+              "raw": "1"
+            }
+          }
+        ],
+        "kind": "var"
+      },
+      {
+        "type": "ExpressionStatement",
+        "start": 25,
+        "end": 38,
+        "loc": {
+          "start": {
+            "line": 3,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 13
+          }
+        },
+        "expression": {
+          "type": "Literal",
+          "start": 25,
+          "end": 37,
+          "loc": {
+            "start": {
+              "line": 3,
+              "column": 0
+            },
+            "end": {
+              "line": 3,
+              "column": 12
+            }
+          },
+          "value": "use strict",
+          "raw": "\"use strict\""
+        }
+      }
+    ]
+  }
+}

test/fixtures/estree/directives/raw/actual.js

@@ -0,0 +1 @@
+"use\x20strict";

test/fixtures/estree/directives/raw/expected.json

@@ -0,0 +1,66 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 16,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 16
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 16,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 16
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 16,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 16
+          }
+        },
+        "expression": {
+          "type": "Literal",
+          "start": 0,
+          "end": 15,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 15
+            }
+          },
+          "value": "use\\x20strict",
+          "raw": "\"use\\x20strict\""
+        },
+        "directive": "use\\x20strict"
+      }
+    ]
+  }
+}

test/fixtures/estree/literal/boolean/actual.js

@@ -0,0 +1,2 @@
+var a = true;
+var b = false;

test/fixtures/estree/literal/boolean/expected.json

@@ -0,0 +1,167 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 28,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 2,
+      "column": 14
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 28,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 2,
+        "column": 14
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 12,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 12
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 5,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 5
+                },
+                "identifierName": "a"
+              },
+              "name": "a"
+            },
+            "init": {
+              "type": "Literal",
+              "start": 8,
+              "end": 12,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 8
+                },
+                "end": {
+                  "line": 1,
+                  "column": 12
+                }
+              },
+              "value": true,
+              "raw": "true"
+            }
+          }
+        ],
+        "kind": "var"
+      },
+      {
+        "type": "VariableDeclaration",
+        "start": 14,
+        "end": 28,
+        "loc": {
+          "start": {
+            "line": 2,
+            "column": 0
+          },
+          "end": {
+            "line": 2,
+            "column": 14
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 18,
+            "end": 27,
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 4
+              },
+              "end": {
+                "line": 2,
+                "column": 13
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 18,
+              "end": 19,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 4
+                },
+                "end": {
+                  "line": 2,
+                  "column": 5
+                },
+                "identifierName": "b"
+              },
+              "name": "b"
+            },
+            "init": {
+              "type": "Literal",
+              "start": 22,
+              "end": 27,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 8
+                },
+                "end": {
+                  "line": 2,
+                  "column": 13
+                }
+              },
+              "value": false,
+              "raw": "false"
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ]
+  }
+}

test/fixtures/estree/literal/null/actual.js

@@ -0,0 +1 @@
+var a = null;

test/fixtures/estree/literal/null/expected.json

@@ -0,0 +1,100 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 13,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 13
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 13,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 13
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 12,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 12
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 5,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 5
+                },
+                "identifierName": "a"
+              },
+              "name": "a"
+            },
+            "init": {
+              "type": "Literal",
+              "start": 8,
+              "end": 12,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 8
+                },
+                "end": {
+                  "line": 1,
+                  "column": 12
+                }
+              },
+              "value": null,
+              "raw": "null"
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ]
+  }
+}

test/fixtures/estree/literal/number/actual.js

@@ -0,0 +1 @@
+var a = 1;

test/fixtures/estree/literal/number/expected.json

@@ -0,0 +1,100 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 10,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 10
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 10,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 10
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 10,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 10
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 9,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 9
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 5,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 5
+                },
+                "identifierName": "a"
+              },
+              "name": "a"
+            },
+            "init": {
+              "type": "Literal",
+              "start": 8,
+              "end": 9,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 8
+                },
+                "end": {
+                  "line": 1,
+                  "column": 9
+                }
+              },
+              "value": 1,
+              "raw": "1"
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ]
+  }
+}

test/fixtures/estree/literal/regexp/actual.js

@@ -0,0 +1 @@
+var a = /.*/i;

test/fixtures/estree/literal/regexp/expected.json

@@ -0,0 +1,104 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 14,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 14
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 14,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 14
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 14,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 14
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 13,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 13
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 5,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 5
+                },
+                "identifierName": "a"
+              },
+              "name": "a"
+            },
+            "init": {
+              "type": "Literal",
+              "start": 8,
+              "end": 13,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 8
+                },
+                "end": {
+                  "line": 1,
+                  "column": 13
+                }
+              },
+              "value": "/.*/i",
+              "raw": "/.*/i",
+              "regex": {
+                "pattern": ".*",
+                "flags": "i"
+              }
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ]
+  }
+}

test/fixtures/estree/literal/string/actual.js

@@ -0,0 +1 @@
+var a = "string";

test/fixtures/estree/literal/string/expected.json

@@ -0,0 +1,100 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 17,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 17
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 17,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 17
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 17,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 17
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 16,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 16
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 5,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 5
+                },
+                "identifierName": "a"
+              },
+              "name": "a"
+            },
+            "init": {
+              "type": "Literal",
+              "start": 8,
+              "end": 16,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 8
+                },
+                "end": {
+                  "line": 1,
+                  "column": 16
+                }
+              },
+              "value": "string",
+              "raw": "\"string\""
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ]
+  }
+}

test/fixtures/estree/object-method/basic/actual.js

@@ -0,0 +1,3 @@
+var bar = {
+  foo() {}
+};

test/fixtures/estree/object-method/basic/expected.json

@@ -0,0 +1,172 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 25,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 2
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 25,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 2
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 25,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 2
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 24,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 3,
+                "column": 1
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 7,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 7
+                },
+                "identifierName": "bar"
+              },
+              "name": "bar"
+            },
+            "init": {
+              "type": "ObjectExpression",
+              "start": 10,
+              "end": 24,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 10
+                },
+                "end": {
+                  "line": 3,
+                  "column": 1
+                }
+              },
+              "properties": [
+                {
+                  "type": "Property",
+                  "start": 14,
+                  "end": 22,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 2
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 10
+                    }
+                  },
+                  "method": true,
+                  "shorthand": false,
+                  "computed": false,
+                  "key": {
+                    "type": "Identifier",
+                    "start": 14,
+                    "end": 17,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 2
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 5
+                      },
+                      "identifierName": "foo"
+                    },
+                    "name": "foo"
+                  },
+                  "kind": "init",
+                  "value": {
+                    "type": "FunctionExpression",
+                    "start": 17,
+                    "end": 22,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 5
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 10
+                      }
+                    },
+                    "id": null,
+                    "generator": false,
+                    "expression": false,
+                    "async": false,
+                    "params": [],
+                    "body": {
+                      "type": "BlockStatement",
+                      "start": 20,
+                      "end": 22,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 8
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 10
+                        }
+                      },
+                      "body": []
+                    }
+                  }
+                }
+              ]
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ]
+  }
+}

test/fixtures/estree/object-property/basic/actual.js

@@ -0,0 +1 @@
+const a = { foo: 1 };

test/fixtures/estree/object-property/basic/expected.json

@@ -0,0 +1,153 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 21,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 21
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 21,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 21
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 21,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 21
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 6,
+            "end": 20,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 6
+              },
+              "end": {
+                "line": 1,
+                "column": 20
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 6,
+              "end": 7,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 7
+                },
+                "identifierName": "a"
+              },
+              "name": "a"
+            },
+            "init": {
+              "type": "ObjectExpression",
+              "start": 10,
+              "end": 20,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 10
+                },
+                "end": {
+                  "line": 1,
+                  "column": 20
+                }
+              },
+              "properties": [
+                {
+                  "type": "Property",
+                  "start": 12,
+                  "end": 18,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 12
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 18
+                    }
+                  },
+                  "method": false,
+                  "shorthand": false,
+                  "computed": false,
+                  "key": {
+                    "type": "Identifier",
+                    "start": 12,
+                    "end": 15,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 12
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 15
+                      },
+                      "identifierName": "foo"
+                    },
+                    "name": "foo"
+                  },
+                  "value": {
+                    "type": "Literal",
+                    "start": 17,
+                    "end": 18,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 17
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 18
+                      }
+                    },
+                    "value": 1,
+                    "raw": "1"
+                  },
+                  "kind": "init"
+                }
+              ]
+            }
+          }
+        ],
+        "kind": "const"
+      }
+    ]
+  }
+}

test/fixtures/estree/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["flow", "jsx", "estree"]
+}

test/fixtures/experimental/object-rest-spread/16/actual.js

@@ -0,0 +1 @@
+var {...{z}} = { z: 1};

test/fixtures/experimental/object-rest-spread/16/expected.json

@@ -0,0 +1,243 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 23,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 23
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 23,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 23
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 23,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 23
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 22,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 22
+              }
+            },
+            "id": {
+              "type": "ObjectPattern",
+              "start": 4,
+              "end": 12,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 12
+                }
+              },
+              "properties": [
+                {
+                  "type": "RestProperty",
+                  "start": 5,
+                  "end": 11,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 5
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 11
+                    }
+                  },
+                  "argument": {
+                    "type": "ObjectPattern",
+                    "start": 8,
+                    "end": 11,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 8
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 11
+                      }
+                    },
+                    "properties": [
+                      {
+                        "type": "ObjectProperty",
+                        "start": 9,
+                        "end": 10,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 9
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 10
+                          }
+                        },
+                        "method": false,
+                        "shorthand": true,
+                        "computed": false,
+                        "key": {
+                          "type": "Identifier",
+                          "start": 9,
+                          "end": 10,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 9
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 10
+                            },
+                            "identifierName": "z"
+                          },
+                          "name": "z"
+                        },
+                        "value": {
+                          "type": "Identifier",
+                          "start": 9,
+                          "end": 10,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 9
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 10
+                            },
+                            "identifierName": "z"
+                          },
+                          "name": "z"
+                        },
+                        "extra": {
+                          "shorthand": true
+                        }
+                      }
+                    ]
+                  }
+                }
+              ]
+            },
+            "init": {
+              "type": "ObjectExpression",
+              "start": 15,
+              "end": 22,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 15
+                },
+                "end": {
+                  "line": 1,
+                  "column": 22
+                }
+              },
+              "properties": [
+                {
+                  "type": "ObjectProperty",
+                  "start": 17,
+                  "end": 21,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 17
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 21
+                    }
+                  },
+                  "method": false,
+                  "shorthand": false,
+                  "computed": false,
+                  "key": {
+                    "type": "Identifier",
+                    "start": 17,
+                    "end": 18,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 17
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 18
+                      },
+                      "identifierName": "z"
+                    },
+                    "name": "z"
+                  },
+                  "value": {
+                    "type": "NumericLiteral",
+                    "start": 20,
+                    "end": 21,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 20
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 21
+                      }
+                    },
+                    "extra": {
+                      "rawValue": 1,
+                      "raw": "1"
+                    },
+                    "value": 1
+                  }
+                }
+              ]
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ],
+    "directives": []
+  }
+}

test/fixtures/experimental/object-rest-spread/17/actual.js

@@ -0,0 +1 @@
+var { ...{ x = 5 } } = {x : 1};

test/fixtures/experimental/object-rest-spread/17/expected.json

@@ -0,0 +1,278 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 31,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 31
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 31,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 31
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 31,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 31
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 30,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 30
+              }
+            },
+            "id": {
+              "type": "ObjectPattern",
+              "start": 4,
+              "end": 20,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 20
+                }
+              },
+              "properties": [
+                {
+                  "type": "RestProperty",
+                  "start": 6,
+                  "end": 18,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 6
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 18
+                    }
+                  },
+                  "argument": {
+                    "type": "ObjectPattern",
+                    "start": 9,
+                    "end": 18,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 9
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 18
+                      }
+                    },
+                    "properties": [
+                      {
+                        "type": "ObjectProperty",
+                        "start": 11,
+                        "end": 16,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 11
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 16
+                          }
+                        },
+                        "method": false,
+                        "shorthand": true,
+                        "computed": false,
+                        "key": {
+                          "type": "Identifier",
+                          "start": 11,
+                          "end": 12,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 11
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 12
+                            },
+                            "identifierName": "x"
+                          },
+                          "name": "x"
+                        },
+                        "value": {
+                          "type": "AssignmentPattern",
+                          "start": 11,
+                          "end": 16,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 11
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 16
+                            }
+                          },
+                          "left": {
+                            "type": "Identifier",
+                            "start": 11,
+                            "end": 12,
+                            "loc": {
+                              "start": {
+                                "line": 1,
+                                "column": 11
+                              },
+                              "end": {
+                                "line": 1,
+                                "column": 12
+                              },
+                              "identifierName": "x"
+                            },
+                            "name": "x"
+                          },
+                          "right": {
+                            "type": "NumericLiteral",
+                            "start": 15,
+                            "end": 16,
+                            "loc": {
+                              "start": {
+                                "line": 1,
+                                "column": 15
+                              },
+                              "end": {
+                                "line": 1,
+                                "column": 16
+                              }
+                            },
+                            "extra": {
+                              "rawValue": 5,
+                              "raw": "5"
+                            },
+                            "value": 5
+                          }
+                        },
+                        "extra": {
+                          "shorthand": true
+                        }
+                      }
+                    ]
+                  }
+                }
+              ]
+            },
+            "init": {
+              "type": "ObjectExpression",
+              "start": 23,
+              "end": 30,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 23
+                },
+                "end": {
+                  "line": 1,
+                  "column": 30
+                }
+              },
+              "properties": [
+                {
+                  "type": "ObjectProperty",
+                  "start": 24,
+                  "end": 29,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 24
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 29
+                    }
+                  },
+                  "method": false,
+                  "shorthand": false,
+                  "computed": false,
+                  "key": {
+                    "type": "Identifier",
+                    "start": 24,
+                    "end": 25,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 24
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 25
+                      },
+                      "identifierName": "x"
+                    },
+                    "name": "x"
+                  },
+                  "value": {
+                    "type": "NumericLiteral",
+                    "start": 28,
+                    "end": 29,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 28
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 29
+                      }
+                    },
+                    "extra": {
+                      "rawValue": 1,
+                      "raw": "1"
+                    },
+                    "value": 1
+                  }
+                }
+              ]
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ],
+    "directives": []
+  }
+}

test/fixtures/flow/predicates/1/actual.js

@@ -0,0 +1 @@
+declare function foo(x: mixed): boolean %checks(x !== null);

test/fixtures/flow/predicates/1/expected.json

@@ -0,0 +1,226 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 60,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 60
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 60,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 60
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "DeclareFunction",
+        "start": 0,
+        "end": 60,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 60
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 17,
+          "end": 59,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 17
+            },
+            "end": {
+              "line": 1,
+              "column": 59
+            },
+            "identifierName": "foo"
+          },
+          "name": "foo",
+          "typeAnnotation": {
+            "type": "TypeAnnotation",
+            "start": 20,
+            "end": 59,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 20
+              },
+              "end": {
+                "line": 1,
+                "column": 59
+              }
+            },
+            "typeAnnotation": {
+              "type": "FunctionTypeAnnotation",
+              "start": 20,
+              "end": 59,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 20
+                },
+                "end": {
+                  "line": 1,
+                  "column": 59
+                }
+              },
+              "typeParameters": null,
+              "params": [
+                {
+                  "type": "FunctionTypeParam",
+                  "start": 21,
+                  "end": 29,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 21
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 29
+                    }
+                  },
+                  "name": {
+                    "type": "Identifier",
+                    "start": 21,
+                    "end": 22,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 21
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 22
+                      },
+                      "identifierName": "x"
+                    },
+                    "name": "x"
+                  },
+                  "optional": false,
+                  "typeAnnotation": {
+                    "type": "MixedTypeAnnotation",
+                    "start": 24,
+                    "end": 29,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 24
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 29
+                      }
+                    }
+                  }
+                }
+              ],
+              "rest": null,
+              "returnType": {
+                "type": "BooleanTypeAnnotation",
+                "start": 32,
+                "end": 39,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 32
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 39
+                  }
+                }
+              }
+            },
+            "predicate": {
+              "type": "DeclaredPredicate",
+              "start": 40,
+              "end": 59,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 40
+                },
+                "end": {
+                  "line": 1,
+                  "column": 59
+                }
+              },
+              "expression": {
+                "type": "BinaryExpression",
+                "start": 48,
+                "end": 58,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 48
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 58
+                  }
+                },
+                "left": {
+                  "type": "Identifier",
+                  "start": 48,
+                  "end": 49,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 48
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 49
+                    },
+                    "identifierName": "x"
+                  },
+                  "name": "x"
+                },
+                "operator": "!==",
+                "right": {
+                  "type": "NullLiteral",
+                  "start": 54,
+                  "end": 58,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 54
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 58
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}

test/fixtures/flow/predicates/2/actual.js

@@ -0,0 +1 @@
+var f = (x: mixed): %checks => typeof x === "string";

test/fixtures/flow/predicates/2/expected.json

@@ -0,0 +1,256 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 53,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 53
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 53,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 53
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 53,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 53
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 52,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 52
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 5,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 5
+                },
+                "identifierName": "f"
+              },
+              "name": "f"
+            },
+            "init": {
+              "type": "ArrowFunctionExpression",
+              "start": 8,
+              "end": 52,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 8
+                },
+                "end": {
+                  "line": 1,
+                  "column": 52
+                }
+              },
+              "returnType": {
+                "type": "TypeAnnotation",
+                "start": 18,
+                "end": 27,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 18
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 27
+                  }
+                },
+                "typeAnnotation": null,
+                "predicate": {
+                  "type": "InferredPredicate",
+                  "start": 20,
+                  "end": 27,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 20
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 27
+                    }
+                  }
+                }
+              },
+              "id": null,
+              "generator": false,
+              "expression": true,
+              "async": false,
+              "params": [
+                {
+                  "type": "Identifier",
+                  "start": 9,
+                  "end": 17,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 9
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 17
+                    },
+                    "identifierName": "x"
+                  },
+                  "name": "x",
+                  "typeAnnotation": {
+                    "type": "TypeAnnotation",
+                    "start": 10,
+                    "end": 17,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 10
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 17
+                      }
+                    },
+                    "typeAnnotation": {
+                      "type": "MixedTypeAnnotation",
+                      "start": 12,
+                      "end": 17,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 12
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 17
+                        }
+                      }
+                    }
+                  }
+                }
+              ],
+              "body": {
+                "type": "BinaryExpression",
+                "start": 31,
+                "end": 52,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 31
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 52
+                  }
+                },
+                "left": {
+                  "type": "UnaryExpression",
+                  "start": 31,
+                  "end": 39,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 31
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 39
+                    }
+                  },
+                  "operator": "typeof",
+                  "prefix": true,
+                  "argument": {
+                    "type": "Identifier",
+                    "start": 38,
+                    "end": 39,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 38
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 39
+                      },
+                      "identifierName": "x"
+                    },
+                    "name": "x"
+                  },
+                  "extra": {
+                    "parenthesizedArgument": false
+                  }
+                },
+                "operator": "===",
+                "right": {
+                  "type": "StringLiteral",
+                  "start": 44,
+                  "end": 52,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 44
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 52
+                    }
+                  },
+                  "extra": {
+                    "rawValue": "string",
+                    "raw": "\"string\""
+                  },
+                  "value": "string"
+                }
+              }
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ],
+    "directives": []
+  }
+}

test/fixtures/flow/predicates/3/actual.js

@@ -0,0 +1 @@
+function foo(x: mixed): %checks { return typeof x === "string"; };

test/fixtures/flow/predicates/3/expected.json

@@ -0,0 +1,270 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 66,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 66
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 66,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 66
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "FunctionDeclaration",
+        "start": 0,
+        "end": 65,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 65
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 9,
+          "end": 12,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 9
+            },
+            "end": {
+              "line": 1,
+              "column": 12
+            },
+            "identifierName": "foo"
+          },
+          "name": "foo"
+        },
+        "generator": false,
+        "expression": false,
+        "async": false,
+        "params": [
+          {
+            "type": "Identifier",
+            "start": 13,
+            "end": 21,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 13
+              },
+              "end": {
+                "line": 1,
+                "column": 21
+              },
+              "identifierName": "x"
+            },
+            "name": "x",
+            "typeAnnotation": {
+              "type": "TypeAnnotation",
+              "start": 14,
+              "end": 21,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 14
+                },
+                "end": {
+                  "line": 1,
+                  "column": 21
+                }
+              },
+              "typeAnnotation": {
+                "type": "MixedTypeAnnotation",
+                "start": 16,
+                "end": 21,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 16
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 21
+                  }
+                }
+              }
+            }
+          }
+        ],
+        "returnType": {
+          "type": "TypeAnnotation",
+          "start": 22,
+          "end": 31,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 22
+            },
+            "end": {
+              "line": 1,
+              "column": 31
+            }
+          },
+          "typeAnnotation": null,
+          "predicate": {
+            "type": "InferredPredicate",
+            "start": 24,
+            "end": 31,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 24
+              },
+              "end": {
+                "line": 1,
+                "column": 31
+              }
+            }
+          }
+        },
+        "body": {
+          "type": "BlockStatement",
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+          "end": 65,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 32
+            },
+            "end": {
+              "line": 1,
+              "column": 65
+            }
+          },
+          "body": [
+            {
+              "type": "ReturnStatement",
+              "start": 34,
+              "end": 63,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 34
+                },
+                "end": {
+                  "line": 1,
+                  "column": 63
+                }
+              },
+              "argument": {
+                "type": "BinaryExpression",
+                "start": 41,
+                "end": 62,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 41
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 62
+                  }
+                },
+                "left": {
+                  "type": "UnaryExpression",
+                  "start": 41,
+                  "end": 49,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 41
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 49
+                    }
+                  },
+                  "operator": "typeof",
+                  "prefix": true,
+                  "argument": {
+                    "type": "Identifier",
+                    "start": 48,
+                    "end": 49,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 48
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 49
+                      },
+                      "identifierName": "x"
+                    },
+                    "name": "x"
+                  },
+                  "extra": {
+                    "parenthesizedArgument": false
+                  }
+                },
+                "operator": "===",
+                "right": {
+                  "type": "StringLiteral",
+                  "start": 54,
+                  "end": 62,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 54
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 62
+                    }
+                  },
+                  "extra": {
+                    "rawValue": "string",
+                    "raw": "\"string\""
+                  },
+                  "value": "string"
+                }
+              }
+            }
+          ],
+          "directives": []
+        }
+      },
+      {
+        "type": "EmptyStatement",
+        "start": 65,
+        "end": 66,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 65
+          },
+          "end": {
+            "line": 1,
+            "column": 66
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}

test/fixtures/flow/predicates/4/actual.js

@@ -0,0 +1 @@
+var f = (x: mixed): % checks => typeof x === "string";

test/fixtures/flow/predicates/4/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected ; (1:18)"
+}

test/fixtures/flow/predicates/5/actual.js

@@ -0,0 +1,3 @@
+function foo(x): % checks {
+  return typeof x === "string";
+}

test/fixtures/flow/predicates/5/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Spaces between ´%´ and ´checks´ are not allowed here. (1:17)"
+}

test/fixtures/flow/predicates/6/actual.js

@@ -0,0 +1 @@
+declare function my_filter<T, P: $Pred<1>>(v: Array<T>, cb: P): Array<$Refine<T,P,1>>;

test/fixtures/flow/predicates/6/expected.json

@@ -0,0 +1,599 @@
+{
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+  "start": 0,
+  "end": 86,
+  "loc": {
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+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 86
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 86,
+    "loc": {
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+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 86
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "DeclareFunction",
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+        "end": 86,
+        "loc": {
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+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 86
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+          "end": 85,
+          "loc": {
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+              "line": 1,
+              "column": 17
+            },
+            "end": {
+              "line": 1,
+              "column": 85
+            },
+            "identifierName": "my_filter"
+          },
+          "name": "my_filter",
+          "typeAnnotation": {
+            "type": "TypeAnnotation",
+            "start": 26,
+            "end": 85,
+            "loc": {
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+                "column": 26
+              },
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+                "line": 1,
+                "column": 85
+              }
+            },
+            "typeAnnotation": {
+              "type": "FunctionTypeAnnotation",
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+              "end": 85,
+              "loc": {
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+                },
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+                  "column": 85
+                }
+              },
+              "typeParameters": {
+                "type": "TypeParameterDeclaration",
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+                "end": 42,
+                "loc": {
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+                    "column": 26
+                  },
+                  "end": {
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+                    "column": 42
+                  }
+                },
+                "params": [
+                  {
+                    "type": "TypeParameter",
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+                    "end": 28,
+                    "loc": {
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+                        "line": 1,
+                        "column": 27
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 28
+                      }
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+                    "name": "T",
+                    "variance": null
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+                  {
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+                    "bound": {
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+                      "end": 41,
+                      "loc": {
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+                        },
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+                        }
+                      },
+                      "typeAnnotation": {
+                        "type": "GenericTypeAnnotation",
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+                        "end": 41,
+                        "loc": {
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+                            "column": 33
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 41
+                          }
+                        },
+                        "typeParameters": {
+                          "type": "TypeParameterInstantiation",
+                          "start": 38,
+                          "end": 41,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 38
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 41
+                            }
+                          },
+                          "params": [
+                            {
+                              "type": "NumericLiteralTypeAnnotation",
+                              "start": 39,
+                              "end": 40,
+                              "loc": {
+                                "start": {
+                                  "line": 1,
+                                  "column": 39
+                                },
+                                "end": {
+                                  "line": 1,
+                                  "column": 40
+                                }
+                              },
+                              "value": 1,
+                              "extra": {
+                                "rawValue": 1,
+                                "raw": "1"
+                              }
+                            }
+                          ]
+                        },
+                        "id": {
+                          "type": "Identifier",
+                          "start": 33,
+                          "end": 38,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 33
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 38
+                            },
+                            "identifierName": "$Pred"
+                          },
+                          "name": "$Pred"
+                        }
+                      }
+                    }
+                  }
+                ]
+              },
+              "params": [
+                {
+                  "type": "FunctionTypeParam",
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+                  "end": 54,
+                  "loc": {
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+                    },
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+                    }
+                  },
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+                    "end": 44,
+                    "loc": {
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+                      },
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+                      },
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+                      }
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+                        },
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+                        }
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+                          "end": 53,
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+                            },
+                            "end": {
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+                            }
+                          },
+                          "typeParameters": null,
+                          "id": {
+                            "type": "Identifier",
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+                            "end": 53,
+                            "loc": {
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+                              },
+                              "end": {
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+                              },
+                              "identifierName": "T"
+                            },
+                            "name": "T"
+                          }
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+                      ]
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+                      "end": 51,
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+                          "line": 1,
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+                        },
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+                          "line": 1,
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+                        },
+                        "identifierName": "Array"
+                      },
+                      "name": "Array"
+                    }
+                  }
+                },
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+                      },
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+                    },
+                    "name": "cb"
+                  },
+                  "optional": false,
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+                    "type": "GenericTypeAnnotation",
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+                    "end": 61,
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+                        },
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+                        },
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+                      },
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+                                },
+                                "end": {
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+                                },
+                                "identifierName": "T"
+                              },
+                              "name": "T"
+                            }
+                          },
+                          {
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+                            "end": 81,
+                            "loc": {
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+                              },
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+                            }
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+                            "extra": {
+                              "rawValue": 1,
+                              "raw": "1"
+                            }
+                          }
+                        ]
+                      },
+                      "id": {
+                        "type": "Identifier",
+                        "start": 70,
+                        "end": 77,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 70
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 77
+                          },
+                          "identifierName": "$Refine"
+                        },
+                        "name": "$Refine"
+                      }
+                    }
+                  ]
+                },
+                "id": {
+                  "type": "Identifier",
+                  "start": 64,
+                  "end": 69,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 64
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 69
+                    },
+                    "identifierName": "Array"
+                  },
+                  "name": "Array"
+                }
+              }
+            }
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}

test/fixtures/flow/regression/issue-321-failing/actual.js

@@ -0,0 +1 @@
+const fn: ( Object, Object Object ) => void = ( o1, o2, ) => o1;

test/fixtures/flow/regression/issue-321-failing/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected , (1:27)"
+}

test/fixtures/flow/regression/issue-321/actual.js

@@ -0,0 +1,2 @@
+const fn: ( Object, ?Object ) => void = ( o1, o2 ) => o1;
+const fn: ( Object, ?Object, ) => void = ( o1, o2, ) => o1;

test/fixtures/flow/regression/issue-321/expected.json

@@ -0,0 +1,618 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 117,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 2,
+      "column": 59
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 117,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 2,
+        "column": 59
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 57,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 57
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 6,
+            "end": 56,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 6
+              },
+              "end": {
+                "line": 1,
+                "column": 56
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 6,
+              "end": 37,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 37
+                },
+                "identifierName": "fn"
+              },
+              "name": "fn",
+              "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "start": 8,
+                "end": 37,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 8
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 37
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "FunctionTypeAnnotation",
+                  "start": 10,
+                  "end": 37,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 10
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 37
+                    }
+                  },
+                  "params": [
+                    {
+                      "type": "FunctionTypeParam",
+                      "start": 12,
+                      "end": 19,
+                      "loc": {
+                        "start": {
+                          "start": {
+                            "line": 1,
+                            "column": 12
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 18
+                          }
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 19
+                        }
+                      },
+                      "name": null,
+                      "optional": false,
+                      "typeAnnotation": {
+                        "type": "GenericTypeAnnotation",
+                        "start": 12,
+                        "end": 18,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 12
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 18
+                          }
+                        },
+                        "typeParameters": null,
+                        "id": {
+                          "type": "Identifier",
+                          "start": 12,
+                          "end": 18,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 12
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 18
+                            },
+                            "identifierName": "Object"
+                          },
+                          "name": "Object"
+                        }
+                      }
+                    },
+                    {
+                      "type": "FunctionTypeParam",
+                      "start": 20,
+                      "end": 27,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 20
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 27
+                        }
+                      },
+                      "name": null,
+                      "optional": false,
+                      "typeAnnotation": {
+                        "type": "NullableTypeAnnotation",
+                        "start": 20,
+                        "end": 27,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 20
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 27
+                          }
+                        },
+                        "typeAnnotation": {
+                          "type": "GenericTypeAnnotation",
+                          "start": 21,
+                          "end": 27,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 21
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 27
+                            }
+                          },
+                          "typeParameters": null,
+                          "id": {
+                            "type": "Identifier",
+                            "start": 21,
+                            "end": 27,
+                            "loc": {
+                              "start": {
+                                "line": 1,
+                                "column": 21
+                              },
+                              "end": {
+                                "line": 1,
+                                "column": 27
+                              },
+                              "identifierName": "Object"
+                            },
+                            "name": "Object"
+                          }
+                        }
+                      }
+                    }
+                  ],
+                  "rest": null,
+                  "returnType": {
+                    "type": "VoidTypeAnnotation",
+                    "start": 33,
+                    "end": 37,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 33
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 37
+                      }
+                    }
+                  },
+                  "typeParameters": null
+                }
+              }
+            },
+            "init": {
+              "type": "ArrowFunctionExpression",
+              "start": 40,
+              "end": 56,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 40
+                },
+                "end": {
+                  "line": 1,
+                  "column": 56
+                }
+              },
+              "id": null,
+              "generator": false,
+              "expression": true,
+              "async": false,
+              "params": [
+                {
+                  "type": "Identifier",
+                  "start": 42,
+                  "end": 44,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 42
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 44
+                    },
+                    "identifierName": "o1"
+                  },
+                  "name": "o1"
+                },
+                {
+                  "type": "Identifier",
+                  "start": 46,
+                  "end": 48,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 46
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 48
+                    },
+                    "identifierName": "o2"
+                  },
+                  "name": "o2"
+                }
+              ],
+              "body": {
+                "type": "Identifier",
+                "start": 54,
+                "end": 56,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 54
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 56
+                  },
+                  "identifierName": "o1"
+                },
+                "name": "o1"
+              }
+            }
+          }
+        ],
+        "kind": "const"
+      },
+      {
+        "type": "VariableDeclaration",
+        "start": 58,
+        "end": 117,
+        "loc": {
+          "start": {
+            "line": 2,
+            "column": 0
+          },
+          "end": {
+            "line": 2,
+            "column": 59
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 64,
+            "end": 116,
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 6
+              },
+              "end": {
+                "line": 2,
+                "column": 58
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 64,
+              "end": 96,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 6
+                },
+                "end": {
+                  "line": 2,
+                  "column": 38
+                },
+                "identifierName": "fn"
+              },
+              "name": "fn",
+              "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "start": 66,
+                "end": 96,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 8
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 38
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "FunctionTypeAnnotation",
+                  "start": 68,
+                  "end": 96,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 10
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 38
+                    }
+                  },
+                  "params": [
+                    {
+                      "type": "FunctionTypeParam",
+                      "start": 70,
+                      "end": 77,
+                      "loc": {
+                        "start": {
+                          "start": {
+                            "line": 2,
+                            "column": 12
+                          },
+                          "end": {
+                            "line": 2,
+                            "column": 18
+                          }
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 19
+                        }
+                      },
+                      "name": null,
+                      "optional": false,
+                      "typeAnnotation": {
+                        "type": "GenericTypeAnnotation",
+                        "start": 70,
+                        "end": 76,
+                        "loc": {
+                          "start": {
+                            "line": 2,
+                            "column": 12
+                          },
+                          "end": {
+                            "line": 2,
+                            "column": 18
+                          }
+                        },
+                        "typeParameters": null,
+                        "id": {
+                          "type": "Identifier",
+                          "start": 70,
+                          "end": 76,
+                          "loc": {
+                            "start": {
+                              "line": 2,
+                              "column": 12
+                            },
+                            "end": {
+                              "line": 2,
+                              "column": 18
+                            },
+                            "identifierName": "Object"
+                          },
+                          "name": "Object"
+                        }
+                      }
+                    },
+                    {
+                      "type": "FunctionTypeParam",
+                      "start": 78,
+                      "end": 85,
+                      "loc": {
+                        "start": {
+                          "line": 2,
+                          "column": 20
+                        },
+                        "end": {
+                          "line": 2,
+                          "column": 27
+                        }
+                      },
+                      "name": null,
+                      "optional": false,
+                      "typeAnnotation": {
+                        "type": "NullableTypeAnnotation",
+                        "start": 78,
+                        "end": 85,
+                        "loc": {
+                          "start": {
+                            "line": 2,
+                            "column": 20
+                          },
+                          "end": {
+                            "line": 2,
+                            "column": 27
+                          }
+                        },
+                        "typeAnnotation": {
+                          "type": "GenericTypeAnnotation",
+                          "start": 79,
+                          "end": 85,
+                          "loc": {
+                            "start": {
+                              "line": 2,
+                              "column": 21
+                            },
+                            "end": {
+                              "line": 2,
+                              "column": 27
+                            }
+                          },
+                          "typeParameters": null,
+                          "id": {
+                            "type": "Identifier",
+                            "start": 79,
+                            "end": 85,
+                            "loc": {
+                              "start": {
+                                "line": 2,
+                                "column": 21
+                              },
+                              "end": {
+                                "line": 2,
+                                "column": 27
+                              },
+                              "identifierName": "Object"
+                            },
+                            "name": "Object"
+                          }
+                        }
+                      }
+                    }
+                  ],
+                  "rest": null,
+                  "returnType": {
+                    "type": "VoidTypeAnnotation",
+                    "start": 92,
+                    "end": 96,
+                    "loc": {
+                      "start": {
+                        "line": 2,
+                        "column": 34
+                      },
+                      "end": {
+                        "line": 2,
+                        "column": 38
+                      }
+                    }
+                  },
+                  "typeParameters": null
+                }
+              }
+            },
+            "init": {
+              "type": "ArrowFunctionExpression",
+              "start": 99,
+              "end": 116,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 41
+                },
+                "end": {
+                  "line": 2,
+                  "column": 58
+                }
+              },
+              "id": null,
+              "generator": false,
+              "expression": true,
+              "async": false,
+              "params": [
+                {
+                  "type": "Identifier",
+                  "start": 101,
+                  "end": 103,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 43
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 45
+                    },
+                    "identifierName": "o1"
+                  },
+                  "name": "o1"
+                },
+                {
+                  "type": "Identifier",
+                  "start": 105,
+                  "end": 107,
+                  "loc": {
+                    "start": {
+                      "line": 2,
+                      "column": 47
+                    },
+                    "end": {
+                      "line": 2,
+                      "column": 49
+                    },
+                    "identifierName": "o2"
+                  },
+                  "name": "o2"
+                }
+              ],
+              "body": {
+                "type": "Identifier",
+                "start": 114,
+                "end": 116,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 56
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 58
+                  },
+                  "identifierName": "o1"
+                },
+                "name": "o1"
+              }
+            }
+          }
+        ],
+        "kind": "const"
+      }
+    ],
+    "directives": []
+  }
+}

test/fixtures/flow/regression/issue-336/actual.js

@@ -0,0 +1 @@
+const fn = async (a?: any): Promise<void> => {};

test/fixtures/flow/regression/issue-336/expected.json

@@ -0,0 +1,249 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 48,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 48
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 48,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 48
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 48,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 48
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 6,
+            "end": 47,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 6
+              },
+              "end": {
+                "line": 1,
+                "column": 47
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 6,
+              "end": 8,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 8
+                },
+                "identifierName": "fn"
+              },
+              "name": "fn"
+            },
+            "init": {
+              "type": "ArrowFunctionExpression",
+              "start": 11,
+              "end": 47,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 11
+                },
+                "end": {
+                  "line": 1,
+                  "column": 47
+                }
+              },
+              "returnType": {
+                "type": "TypeAnnotation",
+                "start": 26,
+                "end": 41,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 26
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 41
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "GenericTypeAnnotation",
+                  "start": 28,
+                  "end": 41,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 28
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 41
+                    }
+                  },
+                  "typeParameters": {
+                    "type": "TypeParameterInstantiation",
+                    "start": 35,
+                    "end": 41,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 35
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 41
+                      }
+                    },
+                    "params": [
+                      {
+                        "type": "VoidTypeAnnotation",
+                        "start": 36,
+                        "end": 40,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 36
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 40
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "id": {
+                    "type": "Identifier",
+                    "start": 28,
+                    "end": 35,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 28
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 35
+                      },
+                      "identifierName": "Promise"
+                    },
+                    "name": "Promise"
+                  }
+                }
+              },
+              "id": null,
+              "generator": false,
+              "expression": false,
+              "async": true,
+              "params": [
+                {
+                  "type": "Identifier",
+                  "start": 18,
+                  "end": 25,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 18
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 25
+                    },
+                    "identifierName": "a"
+                  },
+                  "name": "a",
+                  "optional": true,
+                  "typeAnnotation": {
+                    "type": "TypeAnnotation",
+                    "start": 20,
+                    "end": 25,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 20
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 25
+                      }
+                    },
+                    "typeAnnotation": {
+                      "type": "AnyTypeAnnotation",
+                      "start": 22,
+                      "end": 25,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 22
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 25
+                        }
+                      }
+                    }
+                  }
+                }
+              ],
+              "body": {
+                "type": "BlockStatement",
+                "start": 45,
+                "end": 47,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 45
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 47
+                  }
+                },
+                "body": [],
+                "directives": []
+              }
+            }
+          }
+        ],
+        "kind": "const"
+      }
+    ],
+    "directives": []
+  }
+}

test/fixtures/flow/type-imports/invalid-import-type-as/actual.js

@@ -0,0 +1 @@
+import { type as debugger } from "foo";

test/fixtures/flow/type-imports/invalid-import-type-as/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "debugger is a reserved word (1:17)"
+}

test/fixtures/flow/type-imports/invalid-import-type/actual.js

@@ -0,0 +1 @@
+import { type debugger } from "foo";

test/fixtures/flow/type-imports/invalid-import-type/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "debugger is a reserved word (1:9)"
+}

test/fixtures/flow/type-parameter-declaration/reserved-word-class-name-failure/options.json

@@ -1,4 +1,4 @@
 {
-  "throws": "Unexpected token (1:14)",
+  "throws": "delete is a reserved word (1:14)",
   "plugins": ["flow", "jsx"]
 }

test/index.js

@@ -1,5 +1,5 @@
 import path from "path";
-import runFixtureTests from "./utils/runFixtureTests";
+import { runFixtureTests } from "./utils/runFixtureTests";
 import { parse, parseExpression } from "../lib";
 
 runFixtureTests(path.join(__dirname, "fixtures"), parse);

test/utils/runFixtureTests.js

@@ -1,13 +1,13 @@
 var test = require("ava");
 var getFixtures = require("babel-helper-fixtures").multiple;
 
-module.exports = function runFixtureTests(fixturesPath, parseFunction) {
+exports.runFixtureTests = function runFixtureTests(fixturesPath, parseFunction) {
   var fixtures = getFixtures(fixturesPath);
 
   Object.keys(fixtures).forEach(function (name) {
     fixtures[name].forEach(function (testSuite) {
       testSuite.tests.forEach(function (task) {
-        var testFn = task.disabled ? test.skip : test;
+        var testFn = task.disabled ? test.skip : task.options.only ? test.only : test;
 
         testFn(name + "/" + testSuite.title + "/" + task.title, function () {
             try {
@@ -22,10 +22,41 @@ module.exports = function runFixtureTests(fixturesPath, parseFunction) {
   });
 };
 
+exports.runThrowTestsWithEstree = function runThrowTestsWithEstree(fixturesPath, parseFunction) {
+  var fixtures = getFixtures(fixturesPath);
+
+  Object.keys(fixtures).forEach(function (name) {
+    fixtures[name].forEach(function (testSuite) {
+      testSuite.tests.forEach(function (task) {
+        if (!task.options.throws) return;
+
+        task.options.plugins = task.options.plugins || [];
+        task.options.plugins.push("estree");
+
+        var testFn = task.disabled ? test.skip : task.options.only ? test.only : test;
+
+        testFn(name + "/" + testSuite.title + "/" + task.title, function () {
+          try {
+            return runTest(task, parseFunction);
+          } catch (err) {
+            err.message = task.actual.loc + ": " + err.message;
+            throw err;
+          }
+        });
+      });
+    });
+  });
+};
+
 function save(test, ast) {
   delete ast.tokens;
   if (ast.comments && !ast.comments.length) delete ast.comments;
+
+  // Ensure that RegExp are serialized as strings
+  const toJSON = RegExp.prototype.toJSON;
+  RegExp.prototype.toJSON = RegExp.prototype.toString;
   require("fs").writeFileSync(test.expect.loc, JSON.stringify(ast, null, "  "));
+  RegExp.prototype.toJSON = toJSON;
 }
 
 function runTest(test, parseFunction) {
@@ -69,7 +100,8 @@ function runTest(test, parseFunction) {
 }
 
 function ppJSON(v) {
-  return v instanceof RegExp ? v.toString() : JSON.stringify(v, null, 2);
+  v = v instanceof RegExp ? v.toString() : v;
+  return JSON.stringify(v, null, 2);
 }
 
 function addPath(str, pt) {
@@ -81,20 +113,20 @@ function addPath(str, pt) {
 }
 
 function misMatch(exp, act) {
-  if (!exp || !act || (typeof exp != "object") || (typeof act != "object")) {
+  if (exp instanceof RegExp || act instanceof RegExp) {
-    if (exp !== act && typeof exp != "function")
-      return ppJSON(exp) + " !== " + ppJSON(act);
-  } else if (exp instanceof RegExp || act instanceof RegExp) {
     var left = ppJSON(exp), right = ppJSON(act);
     if (left !== right) return left + " !== " + right;
-  } else if (exp.splice) {
+  } else if (Array.isArray(exp)) {
-    if (!act.slice) return ppJSON(exp) + " != " + ppJSON(act);
+    if (!Array.isArray(act)) return ppJSON(exp) + " != " + ppJSON(act);
     if (act.length != exp.length) return "array length mismatch " + exp.length + " != " + act.length;
     for (var i = 0; i < act.length; ++i) {
       var mis = misMatch(exp[i], act[i]);
       if (mis) return addPath(mis, i);
     }
-  } else {
+  } else if (!exp || !act || (typeof exp != "object") || (typeof act != "object")) {
+    if (exp !== act && typeof exp != "function")
+      return ppJSON(exp) + " !== " + ppJSON(act);
+  } else  {
     for (var prop in exp) {
       var mis = misMatch(exp[prop], act[prop]);
       if (mis) return addPath(mis, prop);