webpack-md5-hash: Hash does not change when only imported modules IDs change

Webpack references modules with number IDs. Seems that when only module IDs change then bundle’s MD5 hash does not change. Look at example. Two builds of the same Webpack chunk. The only difference are IDs of imported modules. Despite this the hashes are same.

https://gist.github.com/Poky85/d8fe2d4711d532fbb3ea25a5efbbf992 https://gist.github.com/Poky85/e441799fdf314684d3eb41744a2ba4c6

Steps to reproduce:

• There are 2 Webpack chunks. For example vendor.js and app.js.
• You can achieve this with Webpack CommonsChunkPlugin (https://webpack.github.io/docs/list-of-plugins.html#commonschunkplugin)
• Modules imported in vendor.js are required in app.js
• App.js changes. As result of this module IDs in vendor.js will also change (IDs are determined by occurence count if you use OccurrenceOrderPlugin (https://webpack.github.io/docs/list-of-plugins.html#occurrenceorderplugin)
• But vendor.js chunk keeps the same hash.

webpack.config:

` var webpack = require(“webpack”); var WebpackMd5HashPlugin = require(‘webpack-md5-hash’); var config = {

entry: {
    "bundle/app": ["./src/app.js"],
    "bundle/vendor": ["./src/vendor.js"]
},

output: {
    path: "./www/assets",
    publicPath: "/assets/",
    filename: "[name].[chunkhash].js",
    chunkFilename: "[name].[chunkhash].js"
},

plugins: [
    new WebpackMd5HashPlugin(),
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.CommonsChunkPlugin({
        name: "bundle/vendor"
    })
],
bail: true

};

module.exports = config; `