react-native/setupBabel.js

59 lines
1.7 KiB
JavaScript

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