String import/export specifier (#12091)

* feat: parse moduleExportName
* feat: add validators
* Support string specifier name in commonjs transform
* Support string specifier name in export-ns-from
* test: add loose testcases
* test: add testcases for amd and umd
* feat: support systemjs
* test: update fixtures fixed in #12110
* add plugin name typings
* test: rename test layout
* feat: implement under moduleStringNames flag
* chore: add plugin syntax module string names
* feat: support ModuleExportName as ModuleExportName
* test: update test fixtures
* fix flow errors
* docs: update AST spec
* feat: support { "some imports" as "some exports" }
* feat: support { "some imports" as "some exports" } in systemjs
* test: add test on `import { "foo" }`
* Address review comments
* add moduleStringNames to missing plugin helpers
* Apply suggestions from code review
* update test fixtures
* Update packages/babel-parser/src/parser/error-message.js
* update test fixtures

Co-Authored-By: Kai Cataldo <kai@kaicataldo.com>
Co-authored-by: Brian Ng <bng412@gmail.com>

packages/babel-core/src/parser/util/missing-plugin-helper.js

@@ -135,6 +135,12 @@ const pluginNameMap = {
       url: "https://git.io/JfK3k",
     },
   },
+  moduleStringNames: {
+    syntax: {
+      name: "@babel/plugin-syntax-module-string-names",
+      url: "https://git.io/JTL8G",
+    },
+  },
   numericSeparator: {
     syntax: {
       name: "@babel/plugin-syntax-numeric-separator",

packages/babel-helper-module-transforms/package.json

@@ -19,6 +19,7 @@
     "@babel/helper-replace-supers": "workspace:^7.10.4",
     "@babel/helper-simple-access": "workspace:^7.10.4",
     "@babel/helper-split-export-declaration": "workspace:^7.11.0",
+    "@babel/helper-validator-identifier": "workspace:^7.10.4",
     "@babel/template": "workspace:^7.10.4",
     "@babel/types": "workspace:^7.11.0",
     "lodash": "^4.17.19"

packages/babel-helper-module-transforms/src/index.js

@@ -10,6 +10,8 @@ import rewriteLiveReferences from "./rewrite-live-references";
 import normalizeAndLoadModuleMetadata, {
   hasExports,
   isSideEffectImport,
+  type ModuleMetadata,
+  type SourceModuleMetadata,
 } from "./normalize-and-load-metadata";
 
 export { default as getModuleName } from "./get-module-name";
@@ -180,33 +182,58 @@ export function buildNamespaceInitStatements(
   return statements;
 }
 
-const getTemplateForReexport = loose => {
+const ReexportTemplate = {
-  return loose
+  loose: template.statement`EXPORTS.EXPORT_NAME = NAMESPACE_IMPORT;`,
-    ? template.statement`EXPORTS.EXPORT_NAME = NAMESPACE.IMPORT_NAME;`
+  looseComputed: template.statement`EXPORTS["EXPORT_NAME"] = NAMESPACE_IMPORT;`,
-    : template`
+  spec: template`
-      Object.defineProperty(EXPORTS, "EXPORT_NAME", {
+    Object.defineProperty(EXPORTS, "EXPORT_NAME", {
-        enumerable: true,
+      enumerable: true,
-        get: function() {
+      get: function() {
-          return NAMESPACE.IMPORT_NAME;
+        return NAMESPACE_IMPORT;
-        },
+      },
-      });
+    });
-    `;
+    `,
 };
 
-const buildReexportsFromMeta = (meta, metadata, loose) => {
+const buildReexportsFromMeta = (
+  meta: ModuleMetadata,
+  metadata: SourceModuleMetadata,
+  loose,
+) => {
   const namespace = metadata.lazy
     ? t.callExpression(t.identifier(metadata.name), [])
     : t.identifier(metadata.name);
 
-  const templateForCurrentMode = getTemplateForReexport(loose);
+  const { stringSpecifiers } = meta;
-  return Array.from(metadata.reexports, ([exportName, importName]) =>
+  return Array.from(metadata.reexports, ([exportName, importName]) => {
-    templateForCurrentMode({
+    let NAMESPACE_IMPORT;
+    if (stringSpecifiers.has(importName)) {
+      NAMESPACE_IMPORT = t.memberExpression(
+        t.cloneNode(namespace),
+        t.stringLiteral(importName),
+        true,
+      );
+    } else {
+      NAMESPACE_IMPORT = NAMESPACE_IMPORT = t.memberExpression(
+        t.cloneNode(namespace),
+        t.identifier(importName),
+      );
+    }
+    const astNodes = {
       EXPORTS: meta.exportName,
       EXPORT_NAME: exportName,
-      NAMESPACE: t.cloneNode(namespace),
+      NAMESPACE_IMPORT,
-      IMPORT_NAME: importName,
+    };
-    }),
+    if (loose) {
-  );
+      if (stringSpecifiers.has(exportName)) {
+        return ReexportTemplate.looseComputed(astNodes);
+      } else {
+        return ReexportTemplate.loose(astNodes);
+      }
+    } else {
+      return ReexportTemplate.spec(astNodes);
+    }
+  });
 };
 
 /**
@@ -363,16 +390,25 @@ function buildExportInitializationStatements(
  * Given a set of export names, create a set of nested assignments to
  * initialize them all to a given expression.
  */
-function buildInitStatement(metadata, exportNames, initExpr) {
+const InitTemplate = {
+  computed: template.expression`EXPORTS["NAME"] = VALUE`,
+  default: template.expression`EXPORTS.NAME = VALUE`,
+};
+
+function buildInitStatement(metadata: ModuleMetadata, exportNames, initExpr) {
+  const { stringSpecifiers, exportName: EXPORTS } = metadata;
   return t.expressionStatement(
-    exportNames.reduce(
+    exportNames.reduce((acc, exportName) => {
-      (acc, exportName) =>
+      const params = {
-        template.expression`EXPORTS.NAME = VALUE`({
+        EXPORTS,
-          EXPORTS: metadata.exportName,
+        NAME: exportName,
-          NAME: exportName,
+        VALUE: acc,
-          VALUE: acc,
+      };
-        }),
+      if (stringSpecifiers.has(exportName)) {
-      initExpr,
+        return InitTemplate.computed(params);
-    ),
+      } else {
+        return InitTemplate.default(params);
+      }
+    }, initExpr),
   );
 }

packages/babel-helper-module-transforms/src/normalize-and-load-metadata.js

@@ -1,5 +1,6 @@
 import { basename, extname } from "path";
 
+import { isIdentifierName } from "@babel/helper-validator-identifier";
 import splitExportDeclaration from "@babel/helper-split-export-declaration";
 
 export type ModuleMetadata = {
@@ -15,6 +16,12 @@ export type ModuleMetadata = {
 
   // Lookup of source file to source file metadata.
   source: Map<string, SourceModuleMetadata>,
+
+  // List of names that should only be printed as string literals.
+  // i.e. `import { "any unicode" as foo } from "some-module"`
+  // `stringSpecifiers` is Set(1) ["any unicode"]
+  // In most cases `stringSpecifiers` is an empty Set
+  stringSpecifiers: Set<string>,
 };
 
 export type InteropType = "default" | "namespace" | "none";
@@ -87,13 +94,18 @@ export default function normalizeModuleAndLoadMetadata(
   if (!exportName) {
     exportName = programPath.scope.generateUidIdentifier("exports").name;
   }
+  const stringSpecifiers = new Set();
 
   nameAnonymousExports(programPath);
 
-  const { local, source, hasExports } = getModuleMetadata(programPath, {
+  const { local, source, hasExports } = getModuleMetadata(
-    loose,
+    programPath,
-    lazy,
+    {
-  });
+      loose,
+      lazy,
+    },
+    stringSpecifiers,
+  );
 
   removeModuleDeclarations(programPath);
 
@@ -124,17 +136,48 @@ export default function normalizeModuleAndLoadMetadata(
     hasExports,
     local,
     source,
+    stringSpecifiers,
   };
 }
 
+function getExportSpecifierName(
+  path: NodePath,
+  stringSpecifiers: Set<string>,
+): string {
+  if (path.isIdentifier()) {
+    return path.node.name;
+  } else if (path.isStringLiteral()) {
+    const stringValue = path.node.value;
+    // add specifier value to `stringSpecifiers` only when it can not be converted to an identifier name
+    // i.e In `import { "foo" as bar }`
+    // we do not consider `"foo"` to be a `stringSpecifier` because we can treat it as
+    // `import { foo as bar }`
+    // This helps minimize the size of `stringSpecifiers` and reduce overhead of checking valid identifier names
+    // when building transpiled code from metadata
+    if (!isIdentifierName(stringValue)) {
+      stringSpecifiers.add(stringValue);
+    }
+    return stringValue;
+  } else {
+    throw new Error(
+      `Expected export specifier to be either Identifier or StringLiteral, got ${path.node.type}`,
+    );
+  }
+}
+
 /**
  * Get metadata about the imports and exports present in this module.
  */
 function getModuleMetadata(
   programPath: NodePath,
   { loose, lazy }: { loose: boolean, lazy: boolean },
+  stringSpecifiers: Set<string>,
 ) {
-  const localData = getLocalExportMetadata(programPath, loose);
+  const localData = getLocalExportMetadata(
+    programPath,
+    loose,
+    stringSpecifiers,
+  );
 
   const sourceData = new Map();
   const getData = sourceNode => {
@@ -199,7 +242,10 @@ function getModuleMetadata(
             });
           }
         } else if (spec.isImportSpecifier()) {
-          const importName = spec.get("imported").node.name;
+          const importName = getExportSpecifierName(
+            spec.get("imported"),
+            stringSpecifiers,
+          );
           const localName = spec.get("local").node.name;
 
           data.imports.set(localName, importName);
@@ -231,8 +277,14 @@ function getModuleMetadata(
         if (!spec.isExportSpecifier()) {
           throw spec.buildCodeFrameError("Unexpected export specifier type");
         }
-        const importName = spec.get("local").node.name;
+        const importName = getExportSpecifierName(
-        const exportName = spec.get("exported").node.name;
+          spec.get("local"),
+          stringSpecifiers,
+        );
+        const exportName = getExportSpecifierName(
+          spec.get("exported"),
+          stringSpecifiers,
+        );
 
         data.reexports.set(exportName, importName);
 
@@ -310,6 +362,7 @@ function getModuleMetadata(
 function getLocalExportMetadata(
   programPath: NodePath,
   loose: boolean,
+  stringSpecifiers: Set<string>,
 ): Map<string, LocalExportMetadata> {
   const bindingKindLookup = new Map();
 
@@ -392,11 +445,13 @@ function getLocalExportMetadata(
         child.get("specifiers").forEach(spec => {
           const local = spec.get("local");
           const exported = spec.get("exported");
+          const localMetadata = getLocalMetadata(local);
+          const exportName = getExportSpecifierName(exported, stringSpecifiers);
 
-          if (exported.node.name === "__esModule") {
+          if (exportName === "__esModule") {
             throw exported.buildCodeFrameError('Illegal export "__esModule".');
           }
-          getLocalMetadata(local).names.push(exported.node.name);
+          localMetadata.names.push(exportName);
         });
       }
     } else if (child.isExportDefaultDeclaration()) {

packages/babel-helper-module-transforms/src/rewrite-live-references.js

@@ -3,7 +3,7 @@ import * as t from "@babel/types";
 import template from "@babel/template";
 import simplifyAccess from "@babel/helper-simple-access";
 
-import type { ModuleMetadata } from "./";
+import type { ModuleMetadata } from "./normalize-and-load-metadata";
 
 export default function rewriteLiveReferences(
   programPath: NodePath,
@@ -71,7 +71,13 @@ export default function rewriteLiveReferences(
       let namespace = t.identifier(meta.name);
       if (meta.lazy) namespace = t.callExpression(namespace, []);
 
-      return t.memberExpression(namespace, t.identifier(importName));
+      const computed = metadata.stringSpecifiers.has(importName);
+
+      return t.memberExpression(
+        namespace,
+        computed ? t.stringLiteral(importName) : t.identifier(importName),
+        computed,
+      );
     },
   });
 }
@@ -135,11 +141,14 @@ const buildBindingExportAssignmentExpression = (
     // class Foo {} export { Foo, Foo as Bar };
     // as
     // class Foo {} exports.Foo = exports.Bar = Foo;
+    const { stringSpecifiers } = metadata;
+    const computed = stringSpecifiers.has(exportName);
     return t.assignmentExpression(
       "=",
       t.memberExpression(
         t.identifier(metadata.exportName),
-        t.identifier(exportName),
+        computed ? t.stringLiteral(exportName) : t.identifier(exportName),
+        /* computed */ computed,
       ),
       expr,
     );

packages/babel-parser/ast/spec.md

@@ -1291,7 +1291,7 @@ interface ImportDeclaration <: ModuleDeclaration {
   type: "ImportDeclaration";
   importKind: null | "type" | "typeof" | "value";
   specifiers: [ ImportSpecifier | ImportDefaultSpecifier | ImportNamespaceSpecifier ];
-  source: Literal;
+  source: StringLiteral;
   attributes?: [ ImportAttribute ];
 }
 ```
@@ -1305,7 +1305,7 @@ An import declaration, e.g., `import foo from "mod";`.
 ```js
 interface ImportSpecifier <: ModuleSpecifier {
   type: "ImportSpecifier";
-  imported: Identifier;
+  imported: Identifier | StringLiteral;
 }
 ```
 
@@ -1352,21 +1352,24 @@ interface ExportNamedDeclaration <: ModuleDeclaration {
   type: "ExportNamedDeclaration";
   declaration: Declaration | null;
   specifiers: [ ExportSpecifier ];
-  source: Literal | null;
+  source: StringLiteral | null;
 }
 ```
 
 An export named declaration, e.g., `export {foo, bar};`, `export {foo} from "mod";`, `export var foo = 1;` or `export * as foo from "bar";`.
 
-_Note: Having `declaration` populated with non-empty `specifiers` or non-null `source` results in an invalid state._
+Note:
+
+- Having `declaration` populated with non-empty `specifiers` or non-null `source` results in an invalid state.
+- If `source` is `null`, for each `specifier` of `specifiers`, `specifier.local` can not be a `StringLiteral`.
 
 ### ExportSpecifier
 
 ```js
 interface ExportSpecifier <: ModuleSpecifier {
   type: "ExportSpecifier";
-  exported: Identifier;
+  exported: Identifier | StringLiteral;
-  local?: Identifier;
+  local?: Identifier | StringLiteral;
 }
 ```
 
@@ -1396,7 +1399,7 @@ An export default declaration, e.g., `export default function () {};` or `export
 ```js
 interface ExportAllDeclaration <: ModuleDeclaration {
   type: "ExportAllDeclaration";
-  source: Literal;
+  source: StringLiteral;
 }
 ```
 

packages/babel-parser/src/parser/error-message.js

@@ -43,6 +43,8 @@ export const ErrorMessages = Object.freeze({
   DuplicateRegExpFlags: "Duplicate regular expression flag",
   ElementAfterRest: "Rest element must be last element",
   EscapedCharNotAnIdentifier: "Invalid Unicode escape",
+  ExportBindingIsString:
+    "A string literal cannot be used as an exported binding without `from`.\n- Did you mean `export { %0 as '%1' } from 'some-module'`?",
   ExportDefaultFromAsIdentifier:
     "'from' is not allowed as an identifier after 'export default'",
   ForInOfLoopInitializer:
@@ -53,6 +55,8 @@ export const ErrorMessages = Object.freeze({
   IllegalLanguageModeDirective:
     "Illegal 'use strict' directive in function with non-simple parameter list",
   IllegalReturn: "'return' outside of function",
+  ImportBindingIsString:
+    'A string literal cannot be used as an imported binding.\n- Did you mean `import { "%0" as foo }`?',
   ImportCallArgumentTrailingComma:
     "Trailing comma is disallowed inside import(...) arguments",
   ImportCallArity: "import() requires exactly %0",
@@ -95,6 +99,8 @@ export const ErrorMessages = Object.freeze({
     "Only string literals are allowed as module attribute values",
   ModuleAttributesWithDuplicateKeys:
     'Duplicate key "%0" is not allowed in module attributes',
+  ModuleExportNameHasLoneSurrogate:
+    "An export name cannot include a lone surrogate, found '\\u%0'",
   ModuleExportUndefined: "Export '%0' is not defined",
   MultipleDefaultsInSwitch: "Multiple default clauses",
   NewlineAfterThrow: "Illegal newline after throw",

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

@@ -39,6 +39,8 @@ const FUNC_NO_FLAGS = 0b000,
   FUNC_HANGING_STATEMENT = 0b010,
   FUNC_NULLABLE_ID = 0b100;
 
+const loneSurrogate = /[\uD800-\uDFFF]/u;
+
 export default class StatementParser extends ExpressionParser {
   // ### Statement parsing
 
@@ -1745,7 +1747,7 @@ export default class StatementParser extends ExpressionParser {
 
       this.next();
 
-      specifier.exported = this.parseIdentifier(true);
+      specifier.exported = this.parseModuleExportName();
       node.specifiers.push(
         this.finishNode(specifier, "ExportNamespaceSpecifier"),
       );
@@ -1938,19 +1940,27 @@ export default class StatementParser extends ExpressionParser {
       } else if (node.specifiers && node.specifiers.length) {
         // Named exports
         for (const specifier of node.specifiers) {
-          this.checkDuplicateExports(specifier, specifier.exported.name);
+          const { exported } = specifier;
+          const exportedName =
+            exported.type === "Identifier" ? exported.name : exported.value;
+          this.checkDuplicateExports(specifier, exportedName);
           // $FlowIgnore
           if (!isFrom && specifier.local) {
-            // check for keywords used as local names
+            const { local } = specifier;
-            this.checkReservedWord(
+            if (local.type === "StringLiteral") {
-              specifier.local.name,
+              this.raise(
-              specifier.local.start,
+                specifier.start,
-              true,
+                Errors.ExportBindingIsString,
-              false,
+                local.extra.raw,
-            );
+                exportedName,
-            // check if export is defined
+              );
-            // $FlowIgnore
+            } else {
-            this.scope.checkLocalExport(specifier.local);
+              // check for keywords used as local names
+              this.checkReservedWord(local.name, local.start, true, false);
+              // check if export is defined
+              // $FlowIgnore
+              this.scope.checkLocalExport(local);
+            }
           }
         }
       } else if (node.declaration) {
@@ -2006,6 +2016,7 @@ export default class StatementParser extends ExpressionParser {
   checkDuplicateExports(
     node:
       | N.Identifier
+      | N.StringLiteral
       | N.ExportNamedDeclaration
       | N.ExportSpecifier
       | N.ExportDefaultSpecifier,
@@ -2041,9 +2052,9 @@ export default class StatementParser extends ExpressionParser {
       }
 
       const node = this.startNode();
-      node.local = this.parseIdentifier(true);
+      node.local = this.parseModuleExportName();
       node.exported = this.eatContextual("as")
-        ? this.parseIdentifier(true)
+        ? this.parseModuleExportName()
         : node.local.__clone();
       nodes.push(this.finishNode(node, "ExportSpecifier"));
     }
@@ -2051,6 +2062,27 @@ export default class StatementParser extends ExpressionParser {
     return nodes;
   }
 
+  // https://tc39.es/ecma262/#prod-ModuleExportName
+  parseModuleExportName(): N.StringLiteral | N.Identifier {
+    if (this.match(tt.string)) {
+      this.expectPlugin("moduleStringNames");
+      const result = this.parseLiteral<N.StringLiteral>(
+        this.state.value,
+        "StringLiteral",
+      );
+      const surrogate = result.value.match(loneSurrogate);
+      if (surrogate) {
+        this.raise(
+          result.start,
+          Errors.ModuleExportNameHasLoneSurrogate,
+          surrogate[0].charCodeAt(0).toString(16),
+        );
+      }
+      return result;
+    }
+    return this.parseIdentifier(true);
+  }
+
   // Parses import declaration.
   // https://tc39.es/ecma262/#prod-ImportDeclaration
 
@@ -2220,17 +2252,20 @@ export default class StatementParser extends ExpressionParser {
   // https://tc39.es/ecma262/#prod-ImportSpecifier
   parseImportSpecifier(node: N.ImportDeclaration): void {
     const specifier = this.startNode();
-    specifier.imported = this.parseIdentifier(true);
+    specifier.imported = this.parseModuleExportName();
     if (this.eatContextual("as")) {
       specifier.local = this.parseIdentifier();
     } else {
-      this.checkReservedWord(
+      const { imported } = specifier;
-        specifier.imported.name,
+      if (imported.type === "StringLiteral") {
-        specifier.start,
+        throw this.raise(
-        true,
+          specifier.start,
-        true,
+          Errors.ImportBindingIsString,
-      );
+          imported.value,
-      specifier.local = specifier.imported.__clone();
+        );
+      }
+      this.checkReservedWord(imported.name, specifier.start, true, true);
+      specifier.local = imported.__clone();
     }
     this.checkLVal(
       specifier.local,

packages/babel-parser/src/types.js

@@ -842,7 +842,7 @@ export type ImportDeclaration = NodeBase & {
 
 export type ImportSpecifier = ModuleSpecifier & {
   type: "ImportSpecifier",
-  imported: Identifier,
+  imported: Identifier | StringLiteral,
 };
 
 export type ImportDefaultSpecifier = ModuleSpecifier & {
@@ -866,7 +866,7 @@ export type ExportNamedDeclaration = NodeBase & {
 
 export type ExportSpecifier = NodeBase & {
   type: "ExportSpecifier",
-  exported: Identifier,
+  exported: Identifier | StringLiteral,
   local: Identifier,
 };
 

packages/babel-parser/test/fixtures/experimental/_no-plugin/module-string-names-export/input.js

@@ -0,0 +1,2 @@
+export { foo as "some exports" };
+var foo;

packages/babel-parser/test/fixtures/experimental/_no-plugin/module-string-names-export/options.json

@@ -0,0 +1,5 @@
+{
+  "throws": "This experimental syntax requires enabling the parser plugin: 'moduleStringNames' (1:16)",
+  "sourceType": "module",
+  "plugins": []
+}

packages/babel-parser/test/fixtures/experimental/_no-plugin/module-string-names-import/input.js

@@ -0,0 +1 @@
+import { "foo" as bar, "default" as qux } from "module-a";

packages/babel-parser/test/fixtures/experimental/_no-plugin/module-string-names-import/options.json

@@ -0,0 +1,5 @@
+{
+  "throws": "This experimental syntax requires enabling the parser plugin: 'moduleStringNames' (1:9)",
+  "sourceType": "module",
+  "plugins": []
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/default-import/input.js

@@ -0,0 +1 @@
+import {"default" as quotation} from "Confucius";

packages/babel-parser/test/fixtures/experimental/module-string-names/default-import/output.json

@@ -0,0 +1,46 @@
+{
+  "type": "File",
+  "start":0,"end":49,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":49}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":49,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":49}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ImportDeclaration",
+        "start":0,"end":49,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":49}},
+        "specifiers": [
+          {
+            "type": "ImportSpecifier",
+            "start":8,"end":30,"loc":{"start":{"line":1,"column":8},"end":{"line":1,"column":30}},
+            "imported": {
+              "type": "StringLiteral",
+              "start":8,"end":17,"loc":{"start":{"line":1,"column":8},"end":{"line":1,"column":17}},
+              "extra": {
+                "rawValue": "default",
+                "raw": "\"default\""
+              },
+              "value": "default"
+            },
+            "local": {
+              "type": "Identifier",
+              "start":21,"end":30,"loc":{"start":{"line":1,"column":21},"end":{"line":1,"column":30},"identifierName":"quotation"},
+              "name": "quotation"
+            }
+          }
+        ],
+        "source": {
+          "type": "StringLiteral",
+          "start":37,"end":48,"loc":{"start":{"line":1,"column":37},"end":{"line":1,"column":48}},
+          "extra": {
+            "rawValue": "Confucius",
+            "raw": "\"Confucius\""
+          },
+          "value": "Confucius"
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/duplicate-exported-binding-check/input.js

@@ -0,0 +1,2 @@
+const foo = 42, bar = 42;
+export { foo, bar as "foo" }

packages/babel-parser/test/fixtures/experimental/module-string-names/duplicate-exported-binding-check/output.json

@@ -0,0 +1,99 @@
+{
+  "type": "File",
+  "start":0,"end":54,"loc":{"start":{"line":1,"column":0},"end":{"line":2,"column":28}},
+  "errors": [
+    "SyntaxError: `foo` has already been exported. Exported identifiers must be unique. (2:14)"
+  ],
+  "program": {
+    "type": "Program",
+    "start":0,"end":54,"loc":{"start":{"line":1,"column":0},"end":{"line":2,"column":28}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start":0,"end":25,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":25}},
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start":6,"end":14,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":14}},
+            "id": {
+              "type": "Identifier",
+              "start":6,"end":9,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":9},"identifierName":"foo"},
+              "name": "foo"
+            },
+            "init": {
+              "type": "NumericLiteral",
+              "start":12,"end":14,"loc":{"start":{"line":1,"column":12},"end":{"line":1,"column":14}},
+              "extra": {
+                "rawValue": 42,
+                "raw": "42"
+              },
+              "value": 42
+            }
+          },
+          {
+            "type": "VariableDeclarator",
+            "start":16,"end":24,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":24}},
+            "id": {
+              "type": "Identifier",
+              "start":16,"end":19,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":19},"identifierName":"bar"},
+              "name": "bar"
+            },
+            "init": {
+              "type": "NumericLiteral",
+              "start":22,"end":24,"loc":{"start":{"line":1,"column":22},"end":{"line":1,"column":24}},
+              "extra": {
+                "rawValue": 42,
+                "raw": "42"
+              },
+              "value": 42
+            }
+          }
+        ],
+        "kind": "const"
+      },
+      {
+        "type": "ExportNamedDeclaration",
+        "start":26,"end":54,"loc":{"start":{"line":2,"column":0},"end":{"line":2,"column":28}},
+        "specifiers": [
+          {
+            "type": "ExportSpecifier",
+            "start":35,"end":38,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":12}},
+            "local": {
+              "type": "Identifier",
+              "start":35,"end":38,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":12},"identifierName":"foo"},
+              "name": "foo"
+            },
+            "exported": {
+              "type": "Identifier",
+              "start":35,"end":38,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":12},"identifierName":"foo"},
+              "name": "foo"
+            }
+          },
+          {
+            "type": "ExportSpecifier",
+            "start":40,"end":52,"loc":{"start":{"line":2,"column":14},"end":{"line":2,"column":26}},
+            "local": {
+              "type": "Identifier",
+              "start":40,"end":43,"loc":{"start":{"line":2,"column":14},"end":{"line":2,"column":17},"identifierName":"bar"},
+              "name": "bar"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":47,"end":52,"loc":{"start":{"line":2,"column":21},"end":{"line":2,"column":26}},
+              "extra": {
+                "rawValue": "foo",
+                "raw": "\"foo\""
+              },
+              "value": "foo"
+            }
+          }
+        ],
+        "source": null,
+        "declaration": null
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/export-from/input.js

@@ -0,0 +1 @@
+export { "學而時習之，不亦說乎？", "吾道一以貫之。" as "忠恕。" } from "Confucius";

packages/babel-parser/test/fixtures/experimental/module-string-names/export-from/output.json

@@ -0,0 +1,73 @@
+{
+  "type": "File",
+  "start":0,"end":62,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":62}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":62,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":62}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExportNamedDeclaration",
+        "start":0,"end":62,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":62}},
+        "specifiers": [
+          {
+            "type": "ExportSpecifier",
+            "start":9,"end":22,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":22}},
+            "local": {
+              "type": "StringLiteral",
+              "start":9,"end":22,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":22}},
+              "extra": {
+                "rawValue": "學而時習之，不亦說乎？",
+                "raw": "\"學而時習之，不亦說乎？\""
+              },
+              "value": "學而時習之，不亦說乎？"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":9,"end":22,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":22}},
+              "extra": {
+                "rawValue": "學而時習之，不亦說乎？",
+                "raw": "\"學而時習之，不亦說乎？\""
+              },
+              "value": "學而時習之，不亦說乎？"
+            }
+          },
+          {
+            "type": "ExportSpecifier",
+            "start":24,"end":42,"loc":{"start":{"line":1,"column":24},"end":{"line":1,"column":42}},
+            "local": {
+              "type": "StringLiteral",
+              "start":24,"end":33,"loc":{"start":{"line":1,"column":24},"end":{"line":1,"column":33}},
+              "extra": {
+                "rawValue": "吾道一以貫之。",
+                "raw": "\"吾道一以貫之。\""
+              },
+              "value": "吾道一以貫之。"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":37,"end":42,"loc":{"start":{"line":1,"column":37},"end":{"line":1,"column":42}},
+              "extra": {
+                "rawValue": "忠恕。",
+                "raw": "\"忠恕。\""
+              },
+              "value": "忠恕。"
+            }
+          }
+        ],
+        "source": {
+          "type": "StringLiteral",
+          "start":50,"end":61,"loc":{"start":{"line":1,"column":50},"end":{"line":1,"column":61}},
+          "extra": {
+            "rawValue": "Confucius",
+            "raw": "\"Confucius\""
+          },
+          "value": "Confucius"
+        },
+        "declaration": null
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/export-name-has-lone-surrogate/input.js

@@ -0,0 +1,3 @@
+const foo = 42, bar = 42;
+export { foo as "\ud800\udbff" } // should throw
+export { bar as "\udbff\udfff" } // should not throw

packages/babel-parser/test/fixtures/experimental/module-string-names/export-name-has-lone-surrogate/output.json

@@ -0,0 +1,144 @@
+{
+  "type": "File",
+  "start":0,"end":127,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":52}},
+  "errors": [
+    "SyntaxError: An export name cannot include a lone surrogate, found '\\ud800' (2:16)"
+  ],
+  "program": {
+    "type": "Program",
+    "start":0,"end":127,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":52}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start":0,"end":25,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":25}},
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start":6,"end":14,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":14}},
+            "id": {
+              "type": "Identifier",
+              "start":6,"end":9,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":9},"identifierName":"foo"},
+              "name": "foo"
+            },
+            "init": {
+              "type": "NumericLiteral",
+              "start":12,"end":14,"loc":{"start":{"line":1,"column":12},"end":{"line":1,"column":14}},
+              "extra": {
+                "rawValue": 42,
+                "raw": "42"
+              },
+              "value": 42
+            }
+          },
+          {
+            "type": "VariableDeclarator",
+            "start":16,"end":24,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":24}},
+            "id": {
+              "type": "Identifier",
+              "start":16,"end":19,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":19},"identifierName":"bar"},
+              "name": "bar"
+            },
+            "init": {
+              "type": "NumericLiteral",
+              "start":22,"end":24,"loc":{"start":{"line":1,"column":22},"end":{"line":1,"column":24}},
+              "extra": {
+                "rawValue": 42,
+                "raw": "42"
+              },
+              "value": 42
+            }
+          }
+        ],
+        "kind": "const"
+      },
+      {
+        "type": "ExportNamedDeclaration",
+        "start":26,"end":58,"loc":{"start":{"line":2,"column":0},"end":{"line":2,"column":32}},
+        "trailingComments": [
+          {
+            "type": "CommentLine",
+            "value": " should throw",
+            "start":59,"end":74,"loc":{"start":{"line":2,"column":33},"end":{"line":2,"column":48}}
+          }
+        ],
+        "specifiers": [
+          {
+            "type": "ExportSpecifier",
+            "start":35,"end":56,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":30}},
+            "local": {
+              "type": "Identifier",
+              "start":35,"end":38,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":12},"identifierName":"foo"},
+              "name": "foo"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":42,"end":56,"loc":{"start":{"line":2,"column":16},"end":{"line":2,"column":30}},
+              "extra": {
+                "rawValue": "\ud800\udbff",
+                "raw": "\"\\ud800\\udbff\""
+              },
+              "value": "\ud800\udbff"
+            }
+          }
+        ],
+        "source": null,
+        "declaration": null
+      },
+      {
+        "type": "ExportNamedDeclaration",
+        "start":75,"end":107,"loc":{"start":{"line":3,"column":0},"end":{"line":3,"column":32}},
+        "leadingComments": [
+          {
+            "type": "CommentLine",
+            "value": " should throw",
+            "start":59,"end":74,"loc":{"start":{"line":2,"column":33},"end":{"line":2,"column":48}}
+          }
+        ],
+        "trailingComments": [
+          {
+            "type": "CommentLine",
+            "value": " should not throw",
+            "start":108,"end":127,"loc":{"start":{"line":3,"column":33},"end":{"line":3,"column":52}}
+          }
+        ],
+        "specifiers": [
+          {
+            "type": "ExportSpecifier",
+            "start":84,"end":105,"loc":{"start":{"line":3,"column":9},"end":{"line":3,"column":30}},
+            "local": {
+              "type": "Identifier",
+              "start":84,"end":87,"loc":{"start":{"line":3,"column":9},"end":{"line":3,"column":12},"identifierName":"bar"},
+              "name": "bar"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":91,"end":105,"loc":{"start":{"line":3,"column":16},"end":{"line":3,"column":30}},
+              "extra": {
+                "rawValue": "􏿿",
+                "raw": "\"\\udbff\\udfff\""
+              },
+              "value": "􏿿"
+            }
+          }
+        ],
+        "source": null,
+        "declaration": null
+      }
+    ],
+    "directives": []
+  },
+  "comments": [
+    {
+      "type": "CommentLine",
+      "value": " should throw",
+      "start":59,"end":74,"loc":{"start":{"line":2,"column":33},"end":{"line":2,"column":48}}
+    },
+    {
+      "type": "CommentLine",
+      "value": " should not throw",
+      "start":108,"end":127,"loc":{"start":{"line":3,"column":33},"end":{"line":3,"column":52}}
+    }
+  ]
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/import-local-is-string/input.js

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

packages/babel-parser/test/fixtures/experimental/module-string-names/import-local-is-string/options.json

@@ -0,0 +1,7 @@
+{
+  "sourceType": "module",
+  "plugins": [
+    "moduleStringNames"
+  ],
+  "throws": "A string literal cannot be used as an imported binding.\n- Did you mean `import { \"foo\" as foo }`? (1:9)"
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/mixed/input.js

@@ -0,0 +1,2 @@
+import { "foo" as bar, "default" as qux } from "module-a";
+export * as "foo", { default as "quux" } from "module-b";

packages/babel-parser/test/fixtures/experimental/module-string-names/mixed/output.json

@@ -0,0 +1,111 @@
+{
+  "type": "File",
+  "start":0,"end":116,"loc":{"start":{"line":1,"column":0},"end":{"line":2,"column":57}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":116,"loc":{"start":{"line":1,"column":0},"end":{"line":2,"column":57}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ImportDeclaration",
+        "start":0,"end":58,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":58}},
+        "specifiers": [
+          {
+            "type": "ImportSpecifier",
+            "start":9,"end":21,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":21}},
+            "imported": {
+              "type": "StringLiteral",
+              "start":9,"end":14,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":14}},
+              "extra": {
+                "rawValue": "foo",
+                "raw": "\"foo\""
+              },
+              "value": "foo"
+            },
+            "local": {
+              "type": "Identifier",
+              "start":18,"end":21,"loc":{"start":{"line":1,"column":18},"end":{"line":1,"column":21},"identifierName":"bar"},
+              "name": "bar"
+            }
+          },
+          {
+            "type": "ImportSpecifier",
+            "start":23,"end":39,"loc":{"start":{"line":1,"column":23},"end":{"line":1,"column":39}},
+            "imported": {
+              "type": "StringLiteral",
+              "start":23,"end":32,"loc":{"start":{"line":1,"column":23},"end":{"line":1,"column":32}},
+              "extra": {
+                "rawValue": "default",
+                "raw": "\"default\""
+              },
+              "value": "default"
+            },
+            "local": {
+              "type": "Identifier",
+              "start":36,"end":39,"loc":{"start":{"line":1,"column":36},"end":{"line":1,"column":39},"identifierName":"qux"},
+              "name": "qux"
+            }
+          }
+        ],
+        "source": {
+          "type": "StringLiteral",
+          "start":47,"end":57,"loc":{"start":{"line":1,"column":47},"end":{"line":1,"column":57}},
+          "extra": {
+            "rawValue": "module-a",
+            "raw": "\"module-a\""
+          },
+          "value": "module-a"
+        }
+      },
+      {
+        "type": "ExportNamedDeclaration",
+        "start":59,"end":116,"loc":{"start":{"line":2,"column":0},"end":{"line":2,"column":57}},
+        "specifiers": [
+          {
+            "type": "ExportNamespaceSpecifier",
+            "start":66,"end":76,"loc":{"start":{"line":2,"column":7},"end":{"line":2,"column":17}},
+            "exported": {
+              "type": "StringLiteral",
+              "start":71,"end":76,"loc":{"start":{"line":2,"column":12},"end":{"line":2,"column":17}},
+              "extra": {
+                "rawValue": "foo",
+                "raw": "\"foo\""
+              },
+              "value": "foo"
+            }
+          },
+          {
+            "type": "ExportSpecifier",
+            "start":80,"end":97,"loc":{"start":{"line":2,"column":21},"end":{"line":2,"column":38}},
+            "local": {
+              "type": "Identifier",
+              "start":80,"end":87,"loc":{"start":{"line":2,"column":21},"end":{"line":2,"column":28},"identifierName":"default"},
+              "name": "default"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":91,"end":97,"loc":{"start":{"line":2,"column":32},"end":{"line":2,"column":38}},
+              "extra": {
+                "rawValue": "quux",
+                "raw": "\"quux\""
+              },
+              "value": "quux"
+            }
+          }
+        ],
+        "source": {
+          "type": "StringLiteral",
+          "start":105,"end":115,"loc":{"start":{"line":2,"column":46},"end":{"line":2,"column":56}},
+          "extra": {
+            "rawValue": "module-b",
+            "raw": "\"module-b\""
+          },
+          "value": "module-b"
+        },
+        "declaration": null
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/named-export/input.js

@@ -0,0 +1,2 @@
+const quotation = "";
+export { quotation as "學而時習之，不亦說乎？" };

packages/babel-parser/test/fixtures/experimental/module-string-names/named-export/output.json

@@ -0,0 +1,64 @@
+{
+  "type": "File",
+  "start":0,"end":60,"loc":{"start":{"line":1,"column":0},"end":{"line":2,"column":38}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":60,"loc":{"start":{"line":1,"column":0},"end":{"line":2,"column":38}},
+    "sourceType": "module",
+    "interpreter": null,
+    "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":15,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":15},"identifierName":"quotation"},
+              "name": "quotation"
+            },
+            "init": {
+              "type": "StringLiteral",
+              "start":18,"end":20,"loc":{"start":{"line":1,"column":18},"end":{"line":1,"column":20}},
+              "extra": {
+                "rawValue": "",
+                "raw": "\"\""
+              },
+              "value": ""
+            }
+          }
+        ],
+        "kind": "const"
+      },
+      {
+        "type": "ExportNamedDeclaration",
+        "start":22,"end":60,"loc":{"start":{"line":2,"column":0},"end":{"line":2,"column":38}},
+        "specifiers": [
+          {
+            "type": "ExportSpecifier",
+            "start":31,"end":57,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":35}},
+            "local": {
+              "type": "Identifier",
+              "start":31,"end":40,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":18},"identifierName":"quotation"},
+              "name": "quotation"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":44,"end":57,"loc":{"start":{"line":2,"column":22},"end":{"line":2,"column":35}},
+              "extra": {
+                "rawValue": "學而時習之，不亦說乎？",
+                "raw": "\"學而時習之，不亦說乎？\""
+              },
+              "value": "學而時習之，不亦說乎？"
+            }
+          }
+        ],
+        "source": null,
+        "declaration": null
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/named-import/input.js

@@ -0,0 +1 @@
+import {"學而時習之，不亦說乎？" as quotation} from "Confucius";

packages/babel-parser/test/fixtures/experimental/module-string-names/named-import/output.json

@@ -0,0 +1,46 @@
+{
+  "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",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ImportDeclaration",
+        "start":0,"end":53,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":53}},
+        "specifiers": [
+          {
+            "type": "ImportSpecifier",
+            "start":8,"end":34,"loc":{"start":{"line":1,"column":8},"end":{"line":1,"column":34}},
+            "imported": {
+              "type": "StringLiteral",
+              "start":8,"end":21,"loc":{"start":{"line":1,"column":8},"end":{"line":1,"column":21}},
+              "extra": {
+                "rawValue": "學而時習之，不亦說乎？",
+                "raw": "\"學而時習之，不亦說乎？\""
+              },
+              "value": "學而時習之，不亦說乎？"
+            },
+            "local": {
+              "type": "Identifier",
+              "start":25,"end":34,"loc":{"start":{"line":1,"column":25},"end":{"line":1,"column":34},"identifierName":"quotation"},
+              "name": "quotation"
+            }
+          }
+        ],
+        "source": {
+          "type": "StringLiteral",
+          "start":41,"end":52,"loc":{"start":{"line":1,"column":41},"end":{"line":1,"column":52}},
+          "extra": {
+            "rawValue": "Confucius",
+            "raw": "\"Confucius\""
+          },
+          "value": "Confucius"
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/namespace-export/input.js

@@ -0,0 +1 @@
+export * as "忠恕。" from "Confucius";

packages/babel-parser/test/fixtures/experimental/module-string-names/namespace-export/output.json

@@ -0,0 +1,41 @@
+{
+  "type": "File",
+  "start":0,"end":35,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":35}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":35,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":35}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExportNamedDeclaration",
+        "start":0,"end":35,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":35}},
+        "specifiers": [
+          {
+            "type": "ExportNamespaceSpecifier",
+            "start":7,"end":17,"loc":{"start":{"line":1,"column":7},"end":{"line":1,"column":17}},
+            "exported": {
+              "type": "StringLiteral",
+              "start":12,"end":17,"loc":{"start":{"line":1,"column":12},"end":{"line":1,"column":17}},
+              "extra": {
+                "rawValue": "忠恕。",
+                "raw": "\"忠恕。\""
+              },
+              "value": "忠恕。"
+            }
+          }
+        ],
+        "source": {
+          "type": "StringLiteral",
+          "start":23,"end":34,"loc":{"start":{"line":1,"column":23},"end":{"line":1,"column":34}},
+          "extra": {
+            "rawValue": "Confucius",
+            "raw": "\"Confucius\""
+          },
+          "value": "Confucius"
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/options.json

@@ -0,0 +1,4 @@
+{
+  "sourceType": "module",
+  "plugins": ["moduleStringNames"]
+}

packages/babel-parser/test/fixtures/experimental/module-string-names/string-exported-binding-without-from/input.js

@@ -0,0 +1 @@
+export { "學而時習之，不亦說乎？", "吾道一以貫之。" as "忠恕。" };

packages/babel-parser/test/fixtures/experimental/module-string-names/string-exported-binding-without-from/output.json

@@ -0,0 +1,69 @@
+{
+  "type": "File",
+  "start":0,"end":45,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":45}},
+  "errors": [
+    "SyntaxError: A string literal cannot be used as an exported binding without `from`.\n- Did you mean `export { \"學而時習之，不亦說乎？\" as '學而時習之，不亦說乎？' } from 'some-module'`? (1:9)",
+    "SyntaxError: A string literal cannot be used as an exported binding without `from`.\n- Did you mean `export { \"吾道一以貫之。\" as '忠恕。' } from 'some-module'`? (1:24)"
+  ],
+  "program": {
+    "type": "Program",
+    "start":0,"end":45,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":45}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExportNamedDeclaration",
+        "start":0,"end":45,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":45}},
+        "specifiers": [
+          {
+            "type": "ExportSpecifier",
+            "start":9,"end":22,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":22}},
+            "local": {
+              "type": "StringLiteral",
+              "start":9,"end":22,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":22}},
+              "extra": {
+                "rawValue": "學而時習之，不亦說乎？",
+                "raw": "\"學而時習之，不亦說乎？\""
+              },
+              "value": "學而時習之，不亦說乎？"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":9,"end":22,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":22}},
+              "extra": {
+                "rawValue": "學而時習之，不亦說乎？",
+                "raw": "\"學而時習之，不亦說乎？\""
+              },
+              "value": "學而時習之，不亦說乎？"
+            }
+          },
+          {
+            "type": "ExportSpecifier",
+            "start":24,"end":42,"loc":{"start":{"line":1,"column":24},"end":{"line":1,"column":42}},
+            "local": {
+              "type": "StringLiteral",
+              "start":24,"end":33,"loc":{"start":{"line":1,"column":24},"end":{"line":1,"column":33}},
+              "extra": {
+                "rawValue": "吾道一以貫之。",
+                "raw": "\"吾道一以貫之。\""
+              },
+              "value": "吾道一以貫之。"
+            },
+            "exported": {
+              "type": "StringLiteral",
+              "start":37,"end":42,"loc":{"start":{"line":1,"column":37},"end":{"line":1,"column":42}},
+              "extra": {
+                "rawValue": "忠恕。",
+                "raw": "\"忠恕。\""
+              },
+              "value": "忠恕。"
+            }
+          }
+        ],
+        "source": null,
+        "declaration": null
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/typings/babel-parser.d.ts

@@ -116,6 +116,7 @@ export type ParserPlugin =
     'jsx' |
     'logicalAssignment' |
     'moduleAttributes' |
+    'moduleStringNames' |
     'nullishCoalescingOperator' |
     'numericSeparator' |
     'objectRestSpread' |

packages/babel-plugin-proposal-export-namespace-from/src/index.js

@@ -27,7 +27,9 @@ export default declare(api => {
 
         const specifier = specifiers.shift();
         const { exported } = specifier;
-        const uid = scope.generateUidIdentifier(exported.name);
+        const uid = scope.generateUidIdentifier(
+          exported.name ?? exported.value,
+        );
 
         nodes.push(
           t.importDeclaration(

packages/babel-plugin-proposal-export-namespace-from/test/fixtures/export-namespace/namespace-string/input.mjs

@@ -0,0 +1 @@
+export * as "some exports" from "foo";

packages/babel-plugin-proposal-export-namespace-from/test/fixtures/export-namespace/namespace-string/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "external-helpers",
+    "proposal-export-namespace-from",
+    "syntax-module-string-names"
+  ]
+}

packages/babel-plugin-proposal-export-namespace-from/test/fixtures/export-namespace/namespace-string/output.mjs

@@ -0,0 +1,2 @@
+import * as _someExports from "foo";
+export { _someExports as "some exports" };

packages/babel-plugin-syntax-module-string-names/.npmignore

@@ -0,0 +1,3 @@
+*.log
+src
+test

packages/babel-plugin-syntax-module-string-names/README.md

@@ -0,0 +1,19 @@
+# @babel/plugin-syntax-module-string-names
+
+> Allow parsing `import { 'any unicode' as bar }` and `export { foo as 'any unicode' }`"
+
+See our website [@babel/plugin-syntax-module-string-names](https://babeljs.io/docs/en/next/babel-plugin-syntax-module-string-names.html) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-syntax-module-string-names
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-syntax-module-string-names --dev
+```

packages/babel-plugin-syntax-module-string-names/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "@babel/plugin-syntax-module-string-names",
+  "version": "0.0.0",
+  "description": "Allow parsing `import { 'any unicode' as bar }` and `export { foo as 'any unicode' }`",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-plugin-syntax-module-string-names"
+  },
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./lib/index.js",
+  "exports": "./lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "workspace:^7.10.4"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "workspace:^7.10.4"
+  }
+}

packages/babel-plugin-syntax-module-string-names/src/index.js

@@ -0,0 +1,13 @@
+import { declare } from "@babel/helper-plugin-utils";
+
+export default declare(api => {
+  api.assertVersion(7);
+
+  return {
+    name: "syntax-module-string-names",
+
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("moduleStringNames");
+    },
+  };
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-from-string-as-string/input.mjs

@@ -0,0 +1 @@
+export { "some imports" as "some exports" } from "foo";

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-from-string-as-string/output.js

@@ -0,0 +1,7 @@
+define(["exports", "foo"], function (_exports, _foo) {
+  "use strict";
+
+  _exports.__esModule = true;
+  _exports["some exports"] = void 0;
+  _exports["some exports"] = _foo["some imports"];
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-from-string/input.mjs

@@ -0,0 +1 @@
+export { "some exports" } from "foo";

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-from-string/output.js

@@ -0,0 +1,7 @@
+define(["exports", "foo"], function (_exports, _foo) {
+  "use strict";
+
+  _exports.__esModule = true;
+  _exports["some exports"] = void 0;
+  _exports["some exports"] = _foo["some exports"];
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-from/input.mjs

@@ -0,0 +1 @@
+export { foo as "some exports" } from "foo";

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-from/output.js

@@ -0,0 +1,7 @@
+define(["exports", "foo"], function (_exports, _foo) {
+  "use strict";
+
+  _exports.__esModule = true;
+  _exports["some exports"] = void 0;
+  _exports["some exports"] = _foo.foo;
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "defaultExports", bar};

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-named-string-can-be-identifier/output.js

@@ -0,0 +1,9 @@
+define(["exports"], function (_exports) {
+  "use strict";
+
+  _exports.__esModule = true;
+  _exports.bar = _exports.defaultExports = void 0;
+  var foo, bar;
+  _exports.bar = bar;
+  _exports.defaultExports = foo;
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-named/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "default exports", bar};

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/export-named/output.js

@@ -0,0 +1,9 @@
+define(["exports"], function (_exports) {
+  "use strict";
+
+  _exports.__esModule = true;
+  _exports.bar = _exports["default exports"] = void 0;
+  var foo, bar;
+  _exports.bar = bar;
+  _exports["default exports"] = foo;
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/import-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,3 @@
+import { "defaultImports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/import-named-string-can-be-identifier/output.js

@@ -0,0 +1,5 @@
+define(["foo"], function (_foo) {
+  "use strict";
+
+  _foo.defaultImports;
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/import-named/input.mjs

@@ -0,0 +1,3 @@
+import {"default imports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/import-named/output.js

@@ -0,0 +1,5 @@
+define(["foo"], function (_foo) {
+  "use strict";
+
+  _foo["default imports"];
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names-loose/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "external-helpers",
+    ["transform-modules-amd", { "loose": true }],
+    "syntax-module-string-names"
+  ]
+}

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-from-string-as-string/input.mjs

@@ -0,0 +1 @@
+export { "some imports" as "some exports" } from "foo";

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-from-string-as-string/output.js

@@ -0,0 +1,13 @@
+define(["exports", "foo"], function (_exports, _foo) {
+  "use strict";
+
+  Object.defineProperty(_exports, "__esModule", {
+    value: true
+  });
+  Object.defineProperty(_exports, "some exports", {
+    enumerable: true,
+    get: function () {
+      return _foo["some imports"];
+    }
+  });
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-from-string/input.mjs

@@ -0,0 +1 @@
+export { "some exports" } from "foo";

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-from-string/output.js

@@ -0,0 +1,13 @@
+define(["exports", "foo"], function (_exports, _foo) {
+  "use strict";
+
+  Object.defineProperty(_exports, "__esModule", {
+    value: true
+  });
+  Object.defineProperty(_exports, "some exports", {
+    enumerable: true,
+    get: function () {
+      return _foo["some exports"];
+    }
+  });
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-from/input.mjs

@@ -0,0 +1 @@
+export { foo as "some exports" } from "foo";

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-from/output.js

@@ -0,0 +1,13 @@
+define(["exports", "foo"], function (_exports, _foo) {
+  "use strict";
+
+  Object.defineProperty(_exports, "__esModule", {
+    value: true
+  });
+  Object.defineProperty(_exports, "some exports", {
+    enumerable: true,
+    get: function () {
+      return _foo.foo;
+    }
+  });
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "defaultExports", bar};

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-named-string-can-be-identifier/output.js

@@ -0,0 +1,11 @@
+define(["exports"], function (_exports) {
+  "use strict";
+
+  Object.defineProperty(_exports, "__esModule", {
+    value: true
+  });
+  _exports.bar = _exports.defaultExports = void 0;
+  var foo, bar;
+  _exports.bar = bar;
+  _exports.defaultExports = foo;
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-named/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "default exports", bar};

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/export-named/output.js

@@ -0,0 +1,11 @@
+define(["exports"], function (_exports) {
+  "use strict";
+
+  Object.defineProperty(_exports, "__esModule", {
+    value: true
+  });
+  _exports.bar = _exports["default exports"] = void 0;
+  var foo, bar;
+  _exports.bar = bar;
+  _exports["default exports"] = foo;
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/import-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,3 @@
+import { "defaultImports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/import-named-string-can-be-identifier/output.js

@@ -0,0 +1,5 @@
+define(["foo"], function (_foo) {
+  "use strict";
+
+  _foo.defaultImports;
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/import-named/input.mjs

@@ -0,0 +1,3 @@
+import {"default imports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/import-named/output.js

@@ -0,0 +1,5 @@
+define(["foo"], function (_foo) {
+  "use strict";
+
+  _foo["default imports"];
+});

packages/babel-plugin-transform-modules-amd/test/fixtures/interop-module-string-names/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "external-helpers",
+    "transform-modules-amd",
+    "syntax-module-string-names"
+  ]
+}

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-from-string-as-string/input.mjs

@@ -0,0 +1 @@
+export { "some imports" as "some exports" } from "foo";

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-from-string-as-string/output.js

@@ -0,0 +1,8 @@
+"use strict";
+
+exports.__esModule = true;
+exports["some exports"] = void 0;
+
+var _foo = require("foo");
+
+exports["some exports"] = _foo["some imports"];

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-from-string/input.mjs

@@ -0,0 +1 @@
+export { "some exports" } from "foo";

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-from-string/output.js

@@ -0,0 +1,8 @@
+"use strict";
+
+exports.__esModule = true;
+exports["some exports"] = void 0;
+
+var _foo = require("foo");
+
+exports["some exports"] = _foo["some exports"];

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-from/input.mjs

@@ -0,0 +1 @@
+export { foo as "some exports" } from "foo";

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-from/output.js

@@ -0,0 +1,8 @@
+"use strict";
+
+exports.__esModule = true;
+exports["some exports"] = void 0;
+
+var _foo = require("foo");
+
+exports["some exports"] = _foo.foo;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "defaultExports", bar};

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-named-string-can-be-identifier/output.js

@@ -0,0 +1,7 @@
+"use strict";
+
+exports.__esModule = true;
+exports.bar = exports.defaultExports = void 0;
+var foo, bar;
+exports.bar = bar;
+exports.defaultExports = foo;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-named/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "default exports", bar};

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/export-named/output.js

@@ -0,0 +1,7 @@
+"use strict";
+
+exports.__esModule = true;
+exports.bar = exports["default exports"] = void 0;
+var foo, bar;
+exports.bar = bar;
+exports["default exports"] = foo;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/import-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,3 @@
+import { "defaultImports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/import-named-string-can-be-identifier/output.js

@@ -0,0 +1,5 @@
+"use strict";
+
+var _foo = require("foo");
+
+_foo.defaultImports;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/import-named/input.mjs

@@ -0,0 +1,3 @@
+import {"default imports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/import-named/output.js

@@ -0,0 +1,5 @@
+"use strict";
+
+var _foo = require("foo");
+
+_foo["default imports"];

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names-loose/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "external-helpers",
+    ["transform-modules-commonjs", { "loose": true }],
+    "syntax-module-string-names"
+  ]
+}

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-from-string-as-string/input.mjs

@@ -0,0 +1 @@
+export { "some imports" as "some exports" } from "foo";

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-from-string-as-string/output.js

@@ -0,0 +1,13 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "some exports", {
+  enumerable: true,
+  get: function () {
+    return _foo["some imports"];
+  }
+});
+
+var _foo = require("foo");

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-from-string/input.mjs

@@ -0,0 +1 @@
+export { "some exports" } from "foo";

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-from-string/output.js

@@ -0,0 +1,13 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "some exports", {
+  enumerable: true,
+  get: function () {
+    return _foo["some exports"];
+  }
+});
+
+var _foo = require("foo");

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-from/input.mjs

@@ -0,0 +1 @@
+export { foo as "some exports" } from "foo";

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-from/output.js

@@ -0,0 +1,13 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "some exports", {
+  enumerable: true,
+  get: function () {
+    return _foo.foo;
+  }
+});
+
+var _foo = require("foo");

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "defaultExports", bar};

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-named-string-can-be-identifier/output.js

@@ -0,0 +1,9 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.bar = exports.defaultExports = void 0;
+var foo, bar;
+exports.bar = bar;
+exports.defaultExports = foo;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-named/input.mjs

@@ -0,0 +1,2 @@
+var foo, bar;
+export {foo as "default exports", bar};

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/export-named/output.js

@@ -0,0 +1,9 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.bar = exports["default exports"] = void 0;
+var foo, bar;
+exports.bar = bar;
+exports["default exports"] = foo;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/import-named-string-can-be-identifier/input.mjs

@@ -0,0 +1,3 @@
+import { "defaultImports" as bar} from "foo";
+
+bar;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop-module-string-names/import-named-string-can-be-identifier/output.js

@@ -0,0 +1,5 @@
+"use strict";
+
+var _foo = require("foo");
+
+_foo.defaultImports;