add Statement node type

lib/6to5/modules/common.js

@@ -70,7 +70,7 @@ CommonJSFormatter.prototype.export = function (node, nodes) {
         KEY:   declar.id
       }, true);
 
-      nodes.push(declar);
+      nodes.push(t.toStatement(declar));
       nodes.push(assign);
 
       if (t.isFunctionDeclaration(declar)) {

lib/6to5/modules/ignore.js

@@ -1,5 +1,7 @@
 module.exports = IgnoreFormatter;
 
+var t = require("../types");
+
 function IgnoreFormatter() {
 
 }
@@ -13,7 +15,8 @@ IgnoreFormatter.prototype.importSpecifier = function () {
 };
 
 IgnoreFormatter.prototype.export = function (node, nodes) {
-  nodes.push(node.declaration);
+  var declar = t.toStatement(node.declaration, true);
+  if (declar) nodes.push(declar);
 };
 
 IgnoreFormatter.prototype.exportSpecifier = function () {

lib/6to5/transformers/constants.js

@@ -20,13 +20,15 @@ exports.ForStatement = function (node, parent, file) {
   _.each(node.body, function (child) {
     if (child && t.isVariableDeclaration(child) && child.kind === "const") {
       _.each(child.declarations, function (declar) {
-        _.each(t.getIds(declar.id), function (name) {
+        _.each(t.getIds(declar), function (name) {
           check(declar, [name]);
           constants.push(name);
         });
 
         declar._ignoreConstant = true;
       });
+
+      child._ignoreConstant = true;
       child.kind = "let";
     }
   });
@@ -36,7 +38,7 @@ exports.ForStatement = function (node, parent, file) {
   traverse(node, function (child) {
     if (child._ignoreConstant) return;
 
-    if (t.isVariableDeclarator(child) || t.isFunctionDeclaration(child) || t.isClassDeclaration(child) || t.isAssignmentExpression(child)) {
+    if (t.isVariableDeclarator(child) || t.isDeclaration(child) || t.isAssignmentExpression(child)) {
       check(child, t.getIds(child));
     }
   });

lib/6to5/types/alias-keys.json

@@ -1,9 +1,27 @@
 {
+  "ExpressionStatement": ["Statement"],
+  "BreakStatement":      ["Statement"],
+  "ContinueStatement":   ["Statement"],
+  "DebuggerStatement":   ["Statement"],
+  "DoWhileStatement":    ["Statement"],
+  "IfStatement":         ["Statement"],
+  "ReturnStatement":     ["Statement"],
+  "SwitchStatement":     ["Statement"],
+  "ThrowStatement":      ["Statement"],
+  "TryStatement":        ["Statement"],
+  "WhileStatement":      ["Statement"],
+  "WithStatement":       ["Statement"],
+  "EmptyStatement":      ["Statement"],
+  "LabeledStatement":    ["Statement"],
+  "VariableDeclaration": ["Statement", "Declaration"],
+  "ExportDeclaration":   ["Statement", "Declaration"],
+  "ImportDeclaration":   ["Statement", "Declaration"],
+
   "ArrowFunctionExpression": ["Scope", "Function"],
-  "FunctionDeclaration":     ["Scope", "Function"],
+  "FunctionDeclaration":     ["Statement", "Declaration", "Scope", "Function"],
   "FunctionExpression":      ["Scope", "Function"],
 
-  "BlockStatement": ["Scope"],
+  "BlockStatement": ["Statement", "Scope"],
   "Program":        ["Scope"],
 
   "LogicalExpression": ["Binary"],
@@ -13,12 +31,12 @@
   "SpreadProperty":  ["UnaryLike"],
   "SpreadElement":   ["UnaryLike"],
 
-  "ClassDeclaration": ["Class"],
+  "ClassDeclaration": ["Statement", "Declaration", "Class"],
   "ClassExpression":  ["Class"],
 
-  "ForOfStatement": ["For"],
+  "ForOfStatement": ["Statement", "For"],
-  "ForInStatement": ["For"],
+  "ForInStatement": ["Statement", "For"],
-  "ForStatement":   ["For"],
+  "ForStatement":   ["Statement", "For"],
 
   "ObjectPattern": ["Pattern"],
   "ArrayPattern":  ["Pattern"],

lib/6to5/types/index.js

@@ -74,6 +74,37 @@ t.ensureBlock = function (node) {
   node.body = t.toBlock(node.body, node);
 };
 
+t.toStatement = function (node, ignore) {
+  var mustHaveId = false;
+  var newType;
+
+  if (t.isClass(node)) {
+    mustHaveId = true;
+    newType = "ClassDeclaration";
+  } else if (t.isFunction(node)) {
+    mustHaveId = true;
+    newType = "FunctionDeclaration";
+  } else if (t.isStatement(node)) {
+    newType = node.type;
+  }
+
+  if (mustHaveId && !node.id) {
+    newType = false;
+  }
+
+  if (!newType) {
+    if (ignore) {
+      return false;
+    } else {
+      throw new Error("cannot turn " + node.type + " to a statement");
+    }
+  }
+
+  node.type = newType;
+
+  return node;
+};
+
 t.toBlock = function (node, parent) {
   if (t.isBlockStatement(node)) {
     return node;
@@ -107,8 +138,6 @@ t.getIds = function (node, map) {
       _.each(id.elements, function (elem) {
         search.push(elem);
       });
-    } else if (t.isMemberExpression(id)) {
-      search.push(id.object);
     } else if (t.isAssignmentExpression(id)) {
       search.push(id.left);
     } else if (t.isObjectPattern(id)) {
@@ -117,12 +146,14 @@ t.getIds = function (node, map) {
       });
     } else if (t.isVariableDeclaration(id)) {
       search = search.concat(id.declarations);
-    } else if (t.isVariableDeclarator(id) || t.isFunctionDeclaration(id) || t.isClassDeclaration(id)) {
+    } else if (t.isImportSpecifier(id) || t.isExportSpecifier(id) || t.isVariableDeclarator(id) || t.isFunctionDeclaration(id) || t.isClassDeclaration(id)) {
       search.push(id.id);
     } else if (t.isSpreadElement(id)) {
       search.push(id.argument);
-    } else if (id) {
+    } else if (t.isExportDeclaration(id) || t.isImportDeclaration(id)) {
-      throw new Error("unknown node " + id.type);
+      search = search.concat(id.specifiers);
+    } else if (t.isMemberExpression(id)) {
+      search.push(id.object);
     }
   }