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babelParser.js
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babelParser.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
const babel = require('@babel/core');
const path = require('path');
const TYPESCRIPT_EXTS = {
'.ts': true,
'.tsx': true,
};
function getDefaultPlugins(options: BabelOptions) {
return [
'jsx',
TYPESCRIPT_EXTS[path.extname(options.filename || '')]
? 'typescript'
: 'flow',
'asyncGenerators',
'bigInt',
'classProperties',
'classPrivateProperties',
'classPrivateMethods',
['decorators', { decoratorsBeforeExport: false }],
'doExpressions',
'dynamicImport',
'exportDefaultFrom',
'exportNamespaceFrom',
'functionBind',
'functionSent',
'importMeta',
'logicalAssignment',
'nullishCoalescingOperator',
'numericSeparator',
'objectRestSpread',
'optionalCatchBinding',
'optionalChaining',
['pipelineOperator', { proposal: 'minimal' }],
'throwExpressions',
'topLevelAwait',
];
}
export type Parser = {
parse: (src: string) => ASTNode,
};
type ParserOptions = {
plugins?: Array<string | [string, {}]>,
tokens?: boolean,
};
type BabelOptions = {
cwd?: string,
filename?: string,
envName?: string,
babelrc?: boolean,
root?: string,
rootMode?: string,
configFile?: string | false,
babelrcRoots?: true | string | string[],
};
export type Options = BabelOptions & {
parserOptions?: ParserOptions,
};
function buildOptions(
parserOptions: ?ParserOptions,
babelOptions: BabelOptions,
): ParserOptions {
let parserOpts = {
plugins: [],
};
if (parserOptions) {
parserOpts = {
...parserOptions,
plugins: parserOptions.plugins ? [...parserOptions.plugins] : [],
};
}
const partialConfig = babel.loadPartialConfig(babelOptions);
if (!partialConfig.hasFilesystemConfig() && parserOpts.plugins.length === 0) {
parserOpts.plugins = getDefaultPlugins(babelOptions);
}
// Ensure we always have estree plugin enabled, if we add it a second time
// here it does not matter
parserOpts.plugins.push('estree');
return parserOpts;
}
export default function buildParse(options?: Options = {}): Parser {
const { parserOptions, ...babelOptions } = options;
const parserOpts = buildOptions(parserOptions, babelOptions);
return {
parse(src: string): ASTNode {
return babel.parseSync(src, {
parserOpts,
...babelOptions,
});
},
};
}