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Clean up Yarn detection and install code #1223

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merged 1 commit into from
Dec 10, 2016
Merged

Clean up Yarn detection and install code #1223

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63 changes: 24 additions & 39 deletions packages/create-react-app/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@

var fs = require('fs');
var path = require('path');
var execSync = require('child_process').execSync;
var spawn = require('cross-spawn');
var chalk = require('chalk');
var semver = require('semver');
Expand Down Expand Up @@ -107,49 +108,33 @@ function createApp(name, verbose, version) {
run(root, appName, version, verbose, originalDirectory);
}

function shouldUseYarn() {
try {
execSync('yarn --version', {stdio: 'ignore'});
return true;
} catch (e) {
return false;
}
}

function install(packageToInstall, verbose, callback) {
function fallbackToNpm() {
var npmArgs = [
'install',
verbose && '--verbose',
'--save-dev',
'--save-exact',
packageToInstall,
].filter(function(e) { return e; });
var npmProc = spawn('npm', npmArgs, {stdio: 'inherit'});
npmProc.on('close', function (code) {
callback(code, 'npm', npmArgs);
});
var command;
var args;
if (shouldUseYarn()) {
command = 'yarn';
args = [ 'add', '--dev', '--exact', packageToInstall];
} else {
command = 'npm';
args = ['install', '--save-dev', '--save-exact', packageToInstall];
}

var yarnArgs = [
'add',
'--dev',
'--exact',
packageToInstall,
];
var yarnProc;
var yarnExists = true;
try {
yarnProc = spawn('yarn', yarnArgs, {stdio: 'inherit'});
} catch (err) {
// It's not clear why we end up here in some cases but we need this.
// https://github.com/facebookincubator/create-react-app/issues/1200
yarnExists = false;
fallbackToNpm();
return;
if (verbose) {
args.push('--verbose');
}
yarnProc.on('error', function (err) {
if (err.code === 'ENOENT') {
yarnExists = false;
}
});
yarnProc.on('close', function (code) {
if (yarnExists) {
callback(code, 'yarn', yarnArgs);
} else {
fallbackToNpm();
}

var child = spawn(command, args, {stdio: 'inherit'});
child.on('close', function(code) {
callback(code, command, args);
});
}

Expand Down