@angular/cli/utilities/check-package-manager.js

"use strict";
const chalk = require('chalk');
const child_process_1 = require('child_process');
const config_1 = require('../models/config');
const Promise = require('../ember-cli/lib/ext/promise');
const execPromise = Promise.denodeify(child_process_1.exec);
const packageManager = config_1.CliConfig.fromGlobal().get('packageManager');
function checkYarnOrCNPM() {
    if (packageManager !== 'default') {
        return Promise.resolve();
    }
    return Promise
        .all([checkYarn(), checkCNPM()])
        .then((data) => {
        const [isYarnInstalled, isCNPMInstalled] = data;
        if (isYarnInstalled && isCNPMInstalled) {
            console.log(chalk.yellow('You can `ng set --global packageManager=yarn` '
                + 'or `ng set --global packageManager=cnpm`.'));
        }
        else if (isYarnInstalled) {
            console.log(chalk.yellow('You can `ng set --global packageManager=yarn`.'));
        }
        else if (isCNPMInstalled) {
            console.log(chalk.yellow('You can `ng set --global packageManager=cnpm`.'));
        }
    });
}
exports.checkYarnOrCNPM = checkYarnOrCNPM;
function checkYarn() {
    return execPromise('yarn --version')
        .then(() => true, () => false);
}
function checkCNPM() {
    return execPromise('cnpm --version')
        .then(() => true, () => false);
}
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