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bootstrap.js
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bootstrap.js
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'use strict';
const { execSync, spawn } = require('child_process');
const { resolve } = require('path');
const { existsSync } = require('fs');
const { platform } = require('os');
function shouldUseYarn() {
try {
execSync('yarnpkg --version', { stdio: 'ignore' });
return true;
} catch (e) {
return false;
}
}
function shouldUseNpmConcurrently() {
try {
const versionString = execSync('npm --version');
const m = /^(\d+)[.]/.exec(versionString);
// NPM >= 5 support concurrent installs
return Number(m[1]) >= 5;
} catch (e) {
return false;
}
}
const yarn = shouldUseYarn();
const windows = platform() === 'win32';
const lerna = resolve(
__dirname,
'node_modules',
'.bin',
windows ? 'lerna.cmd' : 'lerna'
);
if (!existsSync(lerna)) {
if (yarn) {
console.log('Cannot find lerna. Please run `yarn --check-files`.');
} else {
console.log(
'Cannot find lerna. Please remove `node_modules` and run `npm install`.'
);
}
process.exit(1);
}
let child;
if (yarn) {
// Yarn does not support concurrency
child = spawn(lerna, ['bootstrap', '--npm-client=yarn', '--concurrency=1'], {
stdio: 'inherit',
});
} else {
let args = ['bootstrap'];
if (
// The Windows filesystem does not handle concurrency well
windows ||
// Only newer npm versions support concurrency
!shouldUseNpmConcurrently()
) {
args.push('--concurrency=1');
}
child = spawn(lerna, args, { stdio: 'inherit' });
}
child.on('close', code => process.exit(code));