npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@nichoth/browser-run

v12.1.0

Published

Transform stream that executes JavaScript it receives in a real browser and outputs console output

Downloads

30

Readme

browser-run

The easiest way of running code in a browser environment.

Bundles electronjs by default!

CI downloads

Usage

$ echo "console.log('Hey from ' + location); window.close()" | browser-run
Hey from http://localhost:53227/
$

Or use browser-run programmatically:

var run = require('browser-run');

var browser = run();
browser.pipe(process.stdout);
browser.end('console.log(location); window.close()');

Example with browserify

$ browserify main.js | browser-run

or

var browserify = require('browserify');
var browser = require('browser-run');

browserify('main.js').bundle().pipe(browser()).pipe(process.stdout);

CLI

$ browser-run --help
Run JavaScript in a browser.
Write code to stdin and receive console output on stdout.
Usage: browser-run [OPTIONS]

Options:
      --version  Show version number                                   [boolean]
  -b, --browser  Browser to use. Always available: electron. Available if
                 installed: chrome, firefox, ie, safari    [default: "electron"]
      --sandbox  Enable electron sandbox               [boolean] [default: true]
      --basedir  Set this if you need to require node modules in node mode
  -h, --help     Print help                                            [boolean]
  -p, --port     Starts listening on that port and waits for you to open a
                 browser
  -s, --static   Serve static assets from this directory
  -m, --mock     Path to code to handle requests for mocking a dynamic back-end
  -i, --input    Input type. Defaults to 'javascript', can be set to 'html'.
  -n, --node     Enable nodejs apis in electron

Custom html file

By using --input html or { input: 'html' } you can provide a custom html file for browser-run to use. Keep in mind though that it always needs to have <script src="/reporter.js"></script> above other script tags so browser-run is able to properly forward your console.logs etc to the terminal.

Dynamic back-end mock

By using --mock mock.js or { mock: 'mock.js'} you can provide a custom server-side implementation and handle all requests that are sent to paths beginning with /mock

mock.js needs to export a function that accepts req and res arguments for handling requests.

Example:

module.exports = function(req,res){
  if (req.url === '/mock/echo') {
    req.pipe(res)
  }
}

API

run([opts])

Returns a duplex stream and starts a webserver.

opts can be:

  • port: If speficied, no browser will be started, so you can point one yourself to http://localhost/<port>
  • browser: Browser to use. Defaults to electron. Available if installed:
    • chrome
    • firefox
    • ie
    • safari
  • static: Serve static files from this directory
  • mock: Path to code to handle requests for mocking a dynamic back-end
  • input: Input type. Defaults to javascript, can be set to html.
  • node: Enable nodejs integration in electron
  • sandbox: Enable electron sandbox. Default: true.
  • basedir: Set this if you need to require node modules in node mode

If only an empty string is written to it, an error will be thrown as there is nothing to execute.

If you call window.close() inside the script, the browser will exit.

run#stop()

Stop the underlying webserver.

Headless testing

In environments without a screen, you can use Xvfb to simulate one.

GitHub Actions

This is a full example to run npm test. Refer to the last 2 lines in the YAML config:

on:
  - pull_request
  - push

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - run: npm install
    - run: xvfb-run npm test
      timeout-minutes: 5 # If the tests fails, the browser will hang open indefinitely

Travis

Add this to your travis.yml:

addons:
  apt:
    packages:
      - xvfb
install:
  - export DISPLAY=':99.0'
  - Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
  - npm install

Full example.

Any gnu/linux box

$ sudo apt-get install xvfb # or equivalent
$ export DISPLAY=':99.0'
$ Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
$ browser-run ...

Docker

There is also an example Docker image. Source

Installation

With npm do

$ npm install browser-run    # for library
$ npm install -g browser-run # for cli

Sponsors

This module is proudly supported by my Sponsors!

Do you want to support modules like this to improve their quality, stability and weigh in on new features? Then please consider donating to my Patreon. Not sure how much of my modules you're using? Try feross/thanks!

License

(MIT)