.prejs

Pre-compile your JS bundles to improve boot performance in Node.JS or Electron

How?

The .prejs uses the Node.JS vm API to create V8 Compile Cache and use that cache when your file is loaded to dramatically improve the initial boot performance.

The benchmark in this repository node benchmark.js reports the following over 50% performance improvement.

Loading lodash.js and compiling for exports
lodash-js: 106.547ms

Loading lodash.prejs and compiling for exports
lodash-prejs: 43.084ms

Installation

npm install dotprejs --save-dev

yarn add dotprejs --dev

Usage

The .prejs module offers both a JS API and a drop-in webpack plugin.

Webpack

const PreJSPlugin = require('dotprejs/src/PreJSPlugin');

module.exports = {
  plugins: [
    new PreJSPlugin({
      // An array of asset names to convert to use prejs
      // This should be the filename that webpack would output
      assets: ['dist.js'],
      // OPTIONAL
      // Can be used to change the node.js runtime to use for
      // generating the V8 compile cache.  If you are targetting
      // electron this should be:
      // runtime: require('electron')
      runtime: process.execPath
    })
  ]
}

You don't have to change any of your other code, .prejs transparently creates a new file continaing your code and compile and cache and injects the .prejs loader into the original file.

JS API

const toolchain = require('dotprejs');

// Docs Coming Soon