mcjs

MCJS

Merge Common JS modules into a single module.

MCJS produces a single module with all inner requirements merged into a single scope with resolved name conflicts. That way it gains maximum compressability and minimal overhead. Smaller than browserify, component, webpack, powerbuild, small.

Some stats

Compare minified gzip-sizes:

| Package | Browserify | bundle-collapser | MCJS | Effect | |---|---|---|---|---|---| | plotly.js | 516kb | 508kb | 494kb | 4.5% | | color-space | 5kb | | 4.4kb | 12% | | mcjs | 4.02kb | | 2.71kb | 32.6% | | mod | 16.5kb | | 13kb | 27% |

Usage

Install

$ npm install mcjs

Use as a browserify plugin:

browserify index.js -p mcjs/plugin

Build

dep.js:

var z = 123;
module.exports = z;

index.js:

var a = require('./dep');
module.exports = a;

Run mcjs:

$ mcjs index.js > bundle.js or $ cat index.js | mcjs > bundle.js

Resulting bundle.js:

var m_a, m_index;

var z = 123;
m_a = z;

var a = m_a;
module.exports = a;

Motivation

Closure compiler can expand any objects, so if to merge modules into a single scope, which means to resolve global vars conflict and to replace all module.exports and require calls, then we get one-scoped bundle, which closure compiler compresses the way better than separated by scopes browserified/compiled bundle.

Mcjs does the same task as a ClosureCompiler with --process_commonjs_modules flag, but avoids creating of goog.provide's and makes variables more human-readable.

Reference

• The cost of small modules