JavaScript runner using Electron. It provides easy DOM manipulation with Node.js scripting 👾.

Getting started

$ npm -g istall electron nirvana-js

Then, write a script:

// your-script.js
console.log(document.querySelector('body').innerHTML);

Finally exec the script with nirvana command ⚡️

$ nirvana your-script.js

Install

npm -g install electron nirvana-js

or

yarn global add electron nirvana-js

Usage

nirvana [option] your-javascript.js [script2 script3 ...]

CLI Options

• c, config : Configuration file path. See Configuration File section at the below.
• d, debug : Run debug mode. It's equivalent to --watch --show.
• b, base-path : The root path location to be used to resolve from.
• w, watch : Watch script files and reload window when they are changed.
• v, verbose: Display debug logging messages.
• q, quiet : Suppress logging messages.
• init : Generate configuration file.
• show : Whether to desplay browser windows.
• custom-context-file: HTML context file path.
• concurrency : How many windows Nirvana launches in parallel. Default 4.
• noCaptureConsole : Suppress to capture logging message in browser.
• noTimeout : Suppress closing browser window via timeout.

Configuration File

You can configure nirvana-js using a configuration JavaScript file. Executing nirvana --init the configuration file nirvana.conf.js is created. For example:

'use strict';
 
module.exports = {
  // scripts: ["a.js", "b.js"],       // Script files to run. Also glob syntax is available e.g. "*.spec.js"
  watch: false,                       // Watch script files and reload window when they are changed.
  concurrency: 4,                     // How many windows Nirvana launches in parallel.
  captureConsole: true,               // Whether to capture logging message in browser.
  // browserNoActivityTimeout: 2000,   // Time period to close window [msec]. If you not want timeout closing, set zero.
  // contextFile: "my-context.html",  // HTML context file.
  
  // Electron BrowserWindow constructor option
  // If you want detail see https://electron.atom.io/docs/api/browser-window/#new-browserwindowoptions.
  windowOption: {
    show: false,
    width: 800,
    height: 600,
    webPreferences: {
      // If you use custom preload script, load 'nirvana-js/preload' in your preload script.
      // preload: 'preload.js'
    },
  },
};

Client Utility Functions

In scripts to run on nirvana-js, some utility functions are available. For example:

const { screenshot } = require('nirvana-js');
 
function yourFunc() {
  doSomething();
  screenshot('my-capture.png');
}

Interface

export declare function isNirvana(): boolean;
export declare function getCurrentWindow(): Electron.BrowserWindow | undefined;
export declare function exit(code?: number): void;
export declare function screenshot(fname: string): Promise<void>;

export declare function isNirvana(): boolean;

Tell whether the platform is running on nirvana-js.

export declare function getCurrentWindow(): Electron.BrowserWindow | undefined;

Get the current browser window.

return A Electron's BrowserWindow object

export declare function exit(code?: number): void;

Close the current browser process immediately.

param code: Exit code.

export declare function screenshot(fname: string): Promise<void>;

Captures a snapshot of the current window.

param fname: The location of captured PNG file.

Tips

When is browserWindow closed ?

By default, nirvana-js's main process is capturing browser windows' logging events. And if no logging event occurs for a certain period of time(specified browserNoActivityTimeout), the main process closes the browser window. If you want to suppress timeout closing, set --no-timeout CLI option. Or set 0 to browserNoActivityTimeout in nivana.conf.js.

If you want to close browserWindows manually, you should call the exit function included client library.

How to run testing framework ?

It's so easy. See example/jasmine .

Capture CPU profile of Node.js script

Run with --debug and launch Chrome's devtools in the window, you can capture CPU profile or performance timeline of your Node.js script.

License

MIT. See license file under this repository.