webpack-md5-hash/plugin/webpack_md5_hash.js

var md5 = require("md5");

function compareModules(a,b) {
    if (a.resource < b.resource)
        return -1;
    if (a.resource > b.resource)
        return 1;
    return 0;
}

function getModuleSource (module) {
    var _source = module._source || {};
    return _source._value || "";
}

function concatenateSource (result, module_source) {
    return result + module_source;
}

function WebpackMd5Hash () {

}

WebpackMd5Hash.prototype.apply = function(compiler) {
    compiler.plugin("compilation", function(compilation) {
        compilation.plugin("chunk-hash", function(chunk, chunkHash) {
            var source = chunk.modules.sort(compareModules).map(getModuleSource).reduce(concatenateSource);
            var chunk_hash = md5(source);
            chunkHash.digest = function () {
                return chunk_hash;
            };
        });
    });
};

module.exports = WebpackMd5Hash;