babel-plugin-transform-modules-commonjs-immutable

#babel-plugin-transform-modules-commonjs-immutable

transform immutable es6 module to commonjs module

##transform ES6

import { log , warn } from './a';
log('init');
log('now is:'+Date.now());
warn('a warning');

when transformed, the imported variables will be convert to property access of the imported object. Normally, we don't mangle property name which is a bad case if we know the propety is immutable.

Instead of transform like

var _a=require('./a');
_a.log('init');
_a.log('now is:'+Date.now());
_a.warn('a warning');

we can refer the imported varibles as local variables if they are immutable. Just like

var _a=require('./a');
var _a$log=_a.log;
_a$log('init');
_a$log('now is:'+Date.now());
_a.warn('a warning');

When the code is mangled,the local variable names will be shortened.For the once-used imported variables, keep it as a property.

Usage

Install

npm install babel-plugin-transform-modules-commonjs-immutable --save-dev

In code

babel.transform(code,{
  plugins:[
    "babel-plugin-transform-modules-commonjs-immutable"
  ]
});

This plugin may cause conflict with "babel-plugin-transform-es2015-modules-commonjs"