npm-install.js #1

'use strict';

// Runs `npm install` in cwd
const path = require('path');
const existsSync = require('exists-sync');
const NpmTask = require('./npm-task');
const formatPackageList = require('../utilities/format-package-list');
const Promise = require('rsvp').Promise;

class NpmInstallTask extends NpmTask {

  constructor(options) {
    super(options);
    this.command = 'install';
  }

  run(options) {
    let ui = this.ui;
    let packageJson = path.join(this.project.root, 'package.json');

    if (!existsSync(packageJson)) {
      ui.writeWarnLine('Skipping npm install: package.json not found');
      return Promise.resolve();
    } else {
      return super.run(options);
    }
  }

  formatStartMessage(packages) {
    return `${this.useYarn ? 'Yarn' : 'npm'}: Installing ${formatPackageList(packages)} ...`;
  }

  formatCompleteMessage(packages) {
    return `${this.useYarn ? 'Yarn' : 'npm'}: Installed ${formatPackageList(packages)}`;
  }
}

module.exports = NpmInstallTask;