82 lines
2.1 KiB
Plaintext
82 lines
2.1 KiB
Plaintext
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/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict-local
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* @format
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*/
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'use strict';
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import type {ParserOptions} from 'hermes-parser';
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import * as HermesParser from 'hermes-parser';
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type Options = {
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/**
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* When set to 'flow', will check files for a `@flow` annotation to apply
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* this plugin, otherwise falling back to Babel's parser.
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*
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* This is independent of `parserOpts.flow`, which may customise 'detect'
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* behaviour within hermes-parser (downstream from this plugin).
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*
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* Defaults to 'all'.
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*/
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parseLangTypes?: 'flow' | 'all',
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};
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export default function BabelPluginSyntaxHermesParser(
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// $FlowExpectedError[unclear-type] We don't have types for this.
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api: any,
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options: Options,
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): $ReadOnly<{...}> {
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api.assertVersion('^7.0.0 || ^8.0.0-alpha.6');
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const {parseLangTypes = 'all'} = options;
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let curParserOpts: ParserOptions = {};
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let curFilename: ?string = null;
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return {
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name: 'syntax-hermes-parser',
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manipulateOptions(
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opts: $ReadOnly<{parserOpts: ParserOptions, filename?: ?string}>,
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) {
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curParserOpts = opts.parserOpts;
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curFilename = opts.filename;
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},
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// API suggested via https://babeljs.io/docs/babel-parser#will-the-babel-parser-support-a-plugin-system
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parserOverride(code: string) {
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const filename = curFilename;
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if (
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filename != null &&
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(filename.endsWith('.ts') || filename.endsWith('.tsx'))
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) {
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return;
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}
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const parserOpts: ParserOptions = {};
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for (const [key, value] of Object.entries(curParserOpts)) {
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if (HermesParser.ParserOptionsKeys.has(key)) {
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// $FlowExpectedError[incompatible-type]
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parserOpts[key] = value;
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}
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}
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if (parseLangTypes === 'flow' && !/@flow/.test(code)) {
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return;
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}
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return HermesParser.parse(code, {...parserOpts, babel: true});
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},
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pre() {
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curParserOpts = {};
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},
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};
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}
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