redux-devtools/packages/redux-devtools-cli/bin/open.js

var opn = require('opn');
var path = require('path');
var spawn = require('cross-spawn');

function open(app, options) {
  if (app === true || app === 'electron') {
    try {
      var port = options.port ? '--port=' + options.port : '';
      spawn.sync(require('electron'), [
        path.join(__dirname, '..', 'app'),
        port,
      ]);
    } catch (error) {
      /* eslint-disable no-console */
      if (error.message === "Cannot find module 'electron'") {
        // TODO: Move electron to dev-dependences to make our package installation faster when not needed.
        console.log(
          '   \x1b[1;31m[Warn]\x1b[0m Electron module not installed.\n'
        );
        /*
        We will use "npm" to install Electron via "npm install -D".
        Do you want to install 'electron' (yes/no): yes
        Installing 'electron' (running 'npm install -D webpack-cli')...
        */
      } else {
        console.log(error);
      }
      /* eslint-enable no-console */
    }
    return;
  }
  opn(
    'http://localhost:' + options.port + '/',
    app !== 'browser' ? { app: app } : undefined
  );
}

module.exports = open;