59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
/**
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* Copyright (c) 2015-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 fs = require('fs');
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const path = require('path');
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const semver = require('semver');
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/**
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* Use Yarn if available, it's much faster than the npm client.
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* Return the version of yarn installed on the system, null if yarn is not available.
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*/
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function getYarnVersionIfAvailable() {
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let yarnVersion;
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try {
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// execSync returns a Buffer -> convert to string
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if (process.platform.startsWith('win')) {
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yarnVersion = (execSync('yarn --version').toString() || '').trim();
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} else {
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yarnVersion = (execSync('yarn --version 2>/dev/null').toString() || '').trim();
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}
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} catch (error) {
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return null;
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}
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// yarn < 0.16 has a 'missing manifest' bug
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try {
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if (semver.gte(yarnVersion, '0.16.0')) {
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return yarnVersion;
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} else {
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return null;
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}
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} catch (error) {
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console.error('Cannot parse yarn version: ' + yarnVersion);
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return null;
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}
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}
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/**
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* Check that 'react-native init' itself used yarn to install React Native.
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* When using an old global react-native-cli@1.0.0 (or older), we don't want
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* to install React Native with npm, and React + Jest with yarn.
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* Let's be safe and not mix yarn and npm in a single project.
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* @param projectDir e.g. /Users/martin/AwesomeApp
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*/
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function isProjectUsingYarn(projectDir) {
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return fs.existsSync(path.join(projectDir, 'yarn.lock'));
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}
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module.exports = {
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getYarnVersionIfAvailable: getYarnVersionIfAvailable,
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isProjectUsingYarn: isProjectUsingYarn,
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};
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