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[@babel/parser] Add "allowUndeclaredExports" option (#9864)

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Ref: https://github.com/babel/notes/blob/master/2019/04/09.md#export-changes-in-scope-pr-break-meteor-issue
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Nicolò Ribaudo 2019-06-30 11:16:05 +02:00 committed by GitHub
parent 77fd7cd4c4
commit ca67637da4
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 116 additions and 1 deletions
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3
packages/babel-parser/src/options.js
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@ -15,6 +15,7 @@ export type Options = {
allowReturnOutsideFunction: boolean,
allowImportExportEverywhere: boolean,
allowSuperOutsideMethod: boolean,
allowUndeclaredExports: boolean,
plugins: PluginList,
strictMode: ?boolean,
ranges: boolean,
@ -41,6 +42,8 @@ export const defaultOptions: Options = {
allowImportExportEverywhere: false,
// TODO
allowSuperOutsideMethod: false,
// When enabled, export statements can reference undeclared variables.
allowUndeclaredExports: false,
// An array of plugins to enable
plugins: [],
// TODO

6
packages/babel-parser/src/parser/statement.js
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@ -45,7 +45,11 @@ export default class StatementParser extends ExpressionParser {
this.parseBlockBody(program, true, true, tt.eof);
if (this.inModule && this.scope.undefinedExports.size > 0) {
if (
this.inModule &&
!this.options.allowUndeclaredExports &&
this.scope.undefinedExports.size > 0
) {
for (const [name] of Array.from(this.scope.undefinedExports)) {
const pos = this.scope.undefinedExports.get(name);
// $FlowIssue

1
packages/babel-parser/test/fixtures/core/opts/allowUndeclaredExports/input.js vendored Normal file
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@ -0,0 +1 @@
export { foo };

4
packages/babel-parser/test/fixtures/core/opts/allowUndeclaredExports/options.json vendored Normal file
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@ -0,0 +1,4 @@
{
"sourceType": "module",
"allowUndeclaredExports": true
}

103
packages/babel-parser/test/fixtures/core/opts/allowUndeclaredExports/output.json vendored Normal file
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@ -0,0 +1,103 @@
{
"type": "File",
"start": 0,
"end": 15,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 15
}
},
"program": {
"type": "Program",
"start": 0,
"end": 15,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 15
}
},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "ExportNamedDeclaration",
"start": 0,
"end": 15,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 15
}
},
"specifiers": [
{
"type": "ExportSpecifier",
"start": 9,
"end": 12,
"loc": {
"start": {
"line": 1,
"column": 9
},
"end": {
"line": 1,
"column": 12
}
},
"local": {
"type": "Identifier",
"start": 9,
"end": 12,
"loc": {
"start": {
"line": 1,
"column": 9
},
"end": {
"line": 1,
"column": 12
},
"identifierName": "foo"
},
"name": "foo"
},
"exported": {
"type": "Identifier",
"start": 9,
"end": 12,
"loc": {
"start": {
"line": 1,
"column": 9
},
"end": {
"line": 1,
"column": 12
},
"identifierName": "foo"
},
"name": "foo"
}
}
],
"source": null,
"declaration": null
}
],
"directives": []
}
}