@babel/eslint-parser: fix ImportExpression node to match ESTree spec (#10828)

* @babel/eslint-parser: fix ImportExpression node to match ESTree spec

* Update caller name for @babel/core.parseSync

* Move logic into estree plugin

* Add estree plugin tests

* Fix Flow error

* Fix flow

* Remove extra properties on ImportExpression node

* Incorporate review feedback

eslint/babel-eslint-parser/src/parse.js

@@ -34,7 +34,7 @@ export default function(code, options) {
       plugins: ["estree"],
     },
     caller: {
-      name: "babel-eslint",
+      name: "@babel/eslint-parser",
     },
   };
 

eslint/babel-eslint-parser/test/babel-eslint-parser.js

@@ -524,5 +524,11 @@ describe("babylon-to-espree", () => {
         const a = 1n;
       `);
     });
+
+    it("Dynamic Import", () => {
+      parseAndAssertSame(`
+        const a = import('a');
+      `);
+    });
   });
 });

packages/babel-parser/src/parser/expression.js

@@ -758,7 +758,7 @@ export default class ExpressionParser extends LValParser {
   finishCallExpression<T: N.CallExpression | N.OptionalCallExpression>(
     node: T,
     optional: boolean,
-  ): T {
+  ): N.Expression {
     if (node.callee.type === "Import") {
       if (node.arguments.length !== 1) {
         this.raise(node.start, "import() requires exactly one argument");

packages/babel-parser/src/parser/lval.js

@@ -228,7 +228,7 @@ export default class LValParser extends NodeUtils {
   toReferencedListDeep(
     exprList: $ReadOnlyArray<?Expression>,
     isParenthesizedExpr?: boolean,
-  ): $ReadOnlyArray<?Expression> {
+  ): void {
     this.toReferencedList(exprList, isParenthesizedExpr);
 
     for (const expr of exprList) {
@@ -236,8 +236,6 @@ export default class LValParser extends NodeUtils {
         this.toReferencedListDeep(expr.elements);
       }
     }
-
-    return exprList;
   }
 
   // Parses spread element.

packages/babel-parser/src/plugins/estree.js

@@ -411,4 +411,32 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         super.toAssignableObjectExpressionProp(prop, isBinding, isLast);
       }
     }
+
+    finishCallExpression<T: N.CallExpression | N.OptionalCallExpression>(
+      node: T,
+      optional: boolean,
+    ): N.Expression {
+      super.finishCallExpression(node, optional);
+
+      if (node.callee.type === "Import") {
+        ((node: N.Node): N.EstreeImportExpression).type = "ImportExpression";
+        ((node: N.Node): N.EstreeImportExpression).source = node.arguments[0];
+        delete node.arguments;
+        delete node.callee;
+      }
+
+      return node;
+    }
+
+    toReferencedListDeep(
+      exprList: $ReadOnlyArray<?N.Expression>,
+      isParenthesizedExpr?: boolean,
+    ): void {
+      // ImportExpressions do not have an arguments array.
+      if (!exprList) {
+        return;
+      }
+
+      super.toReferencedListDeep(exprList, isParenthesizedExpr);
+    }
   };

packages/babel-parser/src/types.js

@@ -1013,7 +1013,7 @@ export type FlowInterfaceType = NodeBase & {
   body: FlowObjectTypeAnnotation,
 };
 
-// estree
+// ESTree
 
 export type EstreeProperty = NodeBase & {
   type: "Property",
@@ -1039,6 +1039,11 @@ export type EstreeMethodDefinition = NodeBase & {
   variance?: ?FlowVariance,
 };
 
+export type EstreeImportExpression = NodeBase & {
+  type: "ImportExpression",
+  source: Expression,
+};
+
 // === === === ===
 // TypeScript
 // === === === ===

packages/babel-parser/test/fixtures/core/categorized/invalid-assignment-pattern-1/options.json

@@ -1,5 +1,3 @@
 {
-  "plugins": [
+  "plugins": ["estree"]
-    "estree"
+}
-  ]
-}

packages/babel-parser/test/fixtures/core/categorized/invalid-assignment-pattern-2/options.json

@@ -1,5 +1,3 @@
 {
-  "plugins": [
+  "plugins": ["estree"]
-    "estree"
+}
-  ]
-}

packages/babel-parser/test/fixtures/core/categorized/invalid-assignment-pattern-3/options.json

@@ -1,5 +1,3 @@
 {
-  "plugins": [
+  "plugins": ["estree"]
-    "estree"
+}
-  ]
-}

packages/babel-parser/test/fixtures/core/categorized/invalid-assignment-pattern-4/options.json

@@ -1,5 +1,3 @@
 {
-  "plugins": [
+  "plugins": ["estree"]
-    "estree"
+}
-  ]
-}

packages/babel-parser/test/fixtures/core/categorized/invalid-assignment-pattern-5/options.json

@@ -1,5 +1,3 @@
 {
-  "plugins": [
+  "plugins": ["estree"]
-    "estree"
+}
-  ]
-}

packages/babel-parser/test/fixtures/estree/bigInt/options.json

@@ -1,6 +1,3 @@
 {
-  "plugins": [
+  "plugins": ["estree", "bigInt"]
-    "estree",
-    "bigInt"
-  ]
 }

packages/babel-parser/test/fixtures/estree/dynamic-import/basic/input.js

@@ -0,0 +1 @@
+const a = import("a");

packages/babel-parser/test/fixtures/estree/dynamic-import/basic/output.json

@@ -0,0 +1,116 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 22,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 22
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 22,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 22
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 22,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 22
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 6,
+            "end": 21,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 6
+              },
+              "end": {
+                "line": 1,
+                "column": 21
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 6,
+              "end": 7,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 7
+                },
+                "identifierName": "a"
+              },
+              "name": "a"
+            },
+            "init": {
+              "type": "ImportExpression",
+              "start": 10,
+              "end": 21,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 10
+                },
+                "end": {
+                  "line": 1,
+                  "column": 21
+                }
+              },
+              "source": {
+                "type": "Literal",
+                "start": 17,
+                "end": 20,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 17
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 20
+                  }
+                },
+                "value": "a",
+                "raw": "\"a\""
+              }
+            }
+          }
+        ],
+        "kind": "const"
+      }
+    ]
+  }
+}

packages/babel-parser/test/fixtures/estree/dynamic-import/options.json

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