fix bug in MinChunkSizePlugin

fix #4532

Author: sokra

lib/optimize/MinChunkSizePlugin.js

@@ -39,7 +39,6 @@ class MinChunkSizePlugin {
 					const a = pair[0].size(options);
 					const b = pair[1].size(options);
 					const ab = pair[0].integratedSize(pair[1], options);
-					pair.unshift(a + b - ab, ab);
 					return [a + b - ab, ab, pair[0], pair[1]];
 				}).filter((pair) => {
 					// filter pairs that do not have an integratedSize

test/configCases/plugins/min-chunk-size/a.js

@@ -0,0 +1 @@
+export default "a";

test/configCases/plugins/min-chunk-size/b.js

@@ -0,0 +1 @@
+export default "b";

test/configCases/plugins/min-chunk-size/index.js

@@ -0,0 +1,19 @@
+it("should combine two chunk if too small", done => {
+	// b should not yet available
+	var bf = __webpack_modules__[require.resolveWeak("./b")];
+	(typeof bf).should.be.eql("undefined");
+
+	// load a
+	import("./a").then(a => {
+		a.default.should.be.eql("a");
+		// check if b is available too
+		var bf = __webpack_modules__[require.resolveWeak("./b")];
+		(typeof bf).should.be.eql("function");
+
+		// load b (just to check if it's ok)
+		import("./b").then(b => {
+			b.default.should.be.eql("b");
+			done();
+		}).catch(done);
+	}).catch(done);
+});

test/configCases/plugins/min-chunk-size/webpack.config.js

@@ -0,0 +1,9 @@
+var webpack = require("../../../../")
+
+module.exports = {
+	plugins: [
+		new webpack.optimize.MinChunkSizePlugin({
+			minChunkSize: 30
+		})
+	]
+}