minimum working test

lib/BannerPlugin.js

@@ -29,6 +29,45 @@ function wrapComment(str) {
  *[N] the N-th match obtained from matching the current file name against options.regExp
  */
 
+const REGEXP_HASH = /\[hash:?(\d+)?\]/gi,
+		REGEXP_CHUNKHASH = /\[chunkhash(?::(\d+))?\]/gi,
+		REGEXP_NAME = /\[name\]/gi,
+		REGEXP_ID = /\[id\]/gi,
+		REGEXP_FILE = /\[file\]/gi,
+		REGEXP_QUERY = /\[query\]/gi;
+
+// withHashLength, getReplacer from lib/TemplatedPathPlugin.js
+const withHashLength = (replacer, handlerFn) => {
+	return function(_, hashLength) {
+		const length = hashLength && parseInt(hashLength, 10);
+		if(length && handlerFn) {
+			return handlerFn(length);
+		}
+
+		const hash = replacer.apply(this, arguments);
+		return length ? hash.slice(0, length) : hash;
+	};
+};
+
+const getReplacer = (value, allowEmpty) => {
+	return function(match) {
+		// last argument in replacer is the entire input string
+		const input = arguments[arguments.length - 1];
+		if(value === null || value === undefined) {
+			if(!allowEmpty) throw new Error(`Path variable ${match} not implemented in this context: ${input}`);
+			return "";
+		} else {
+			return `${value}`;
+		}
+	};
+};
+
+
+const interpolate = (banner, file, hash, chunkHash) => {
+	return banner
+		.replace(REGEXP_HASH, withHashLength(getReplacer(hash)))
+}
+
 class BannerPlugin {
 	constructor(options) {
 		if(arguments.length > 1)
@@ -42,21 +81,19 @@ class BannerPlugin {
 	}
 
 	apply(compiler) {
-		const options = this.options;
-		const banner = this.banner;
+		const options = this.options,
+			banner = this.banner;
 
 		compiler.plugin("compilation", (compilation) => {
-			console.log('compilation: ', JSON.stringify(compilation));
 			compilation.plugin("optimize-chunk-assets", (chunks, callback) => {
 				chunks.forEach((chunk) => {
 					if(options.entryOnly && !chunk.isInitial()) return;
-
 					chunk.files
 						.filter(ModuleFilenameHelpers.matchObject.bind(undefined, options))
 						.forEach((file) => {
-							return compilation.assets[file] = new ConcatSource(
-								banner, "\n", compilation.assets[file]
-							)
+							const chunkHash = chunk.renderedHash || chunk.hash
+							const comment = interpolate(banner, file, compilation.hash, chunkHash)
+							return compilation.assets[file] = new ConcatSource(comment, "\n", compilation.assets[file])
 						});
 				});
 				callback();

test/ConfigTestCases.test.js

@@ -125,7 +125,10 @@ describe("ConfigTestCases", () => {
 							}
 						}
 						// give a free pass to compilation that generated an error
-						if(!jsonStats.errors.length && filesCount !== optionsArr.length) return done(new Error("Should have found at least one bundle file per webpack config"));
+						if(!jsonStats.errors.length && filesCount !== optionsArr.length) {
+							const msg = "Should have found at least one bundle file per webpack config" + filesCount + " "  + " " + optionsArr.length
+							return done(new Error());
+						}
 						if(exportedTests < filesCount) return done(new Error("No tests exported by test case"));
 						process.nextTick(done);
 					});

test/configCases/plugins/banner-plugin-hashing/index.js

@@ -1,11 +1,13 @@
-it("should interpolate file hash in bundle0 chunk", function() {
+it("should interpolate file hash in bundle0 chunk", function(done) {
 	var fs = require("fs");
 	var source = fs
 		.readFileSync(__filename, "utf-8")
 		.split("\n")
 		.slice(0,1)[0];
 
+	//debugger
 	source.should.not.containEql("hash");
+	done()
 });
 
 require.include("./test.js");

test/configCases/plugins/banner-plugin-hashing/test.config.js

@@ -0,0 +1,7 @@
+var fs = require("fs");
+
+module.exports = {
+	findBundle: function(i, options) {
+		return "./banner.js";
+	}
+};

test/configCases/plugins/banner-plugin-hashing/webpack.config.js

@@ -5,7 +5,7 @@ module.exports = {
 		__filename: false
 	},
 	entry: {
-		bundle0: ["./index.js"],
+		banner: ["./index.js"],
 		vendors: ["./vendors.js"]
 	},
 	output: {
@@ -13,8 +13,7 @@ module.exports = {
 	},
 	plugins: [
 		new webpack.BannerPlugin({
-			banner: "[hash]",
-			exclude: ["vendors.js"]
+			banner: "[hash]"
 		})
 	]
 };

test/configCases/plugins/banner-plugin/webpack.config.js

@@ -13,7 +13,7 @@ module.exports = {
 	},
 	plugins: [
 		new webpack.BannerPlugin({
-			banner: "[hash]",
+			banner: "This is a value",
 			exclude: ["vendors.js"]
 		})
 	]