59 lines
1.7 KiB
JavaScript
59 lines
1.7 KiB
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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'use strict';
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const babelRegisterOnly = require('metro-bundler/src/babelRegisterOnly');
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const escapeRegExp = require('lodash/escapeRegExp');
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const path = require('path');
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const BABEL_ENABLED_PATHS = ['local-cli'];
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/**
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* We use absolute paths for matching only the top-level folders reliably. For
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* example, we would not want to match some deeply nested forder that happens to
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* have the same name as one of `BABEL_ENABLED_PATHS`.
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*/
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function buildRegExps(basePath, dirPaths) {
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return dirPaths.map(
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folderPath =>
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// Babel `only` option works with forward slashes in the RegExp so replace
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// backslashes for Windows.
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folderPath instanceof RegExp
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? new RegExp(
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`^${escapeRegExp(
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path.resolve(basePath, '.').replace(/\\/g, '/'),
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)}/${folderPath.source}`,
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folderPath.flags,
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)
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: new RegExp(
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`^${escapeRegExp(
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path.resolve(basePath, folderPath).replace(/\\/g, '/'),
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)}`,
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),
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);
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}
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function getOnlyList() {
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return buildRegExps(__dirname, BABEL_ENABLED_PATHS);
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}
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/**
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* Centralized place to register all the directories that need a Babel
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* transformation before being fed to Node.js. Notably, this is necessary to
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* support Flow type annotations.
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*/
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function setupBabel() {
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babelRegisterOnly(getOnlyList());
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}
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setupBabel.buildRegExps = buildRegExps;
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setupBabel.getOnlyList = getOnlyList;
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module.exports = setupBabel;
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