Merge pull request #14684 from webpack/bugfix/cache-unaffected-module-id

fix a bug with experiments.cacheUnaffected

Author: sokra

lib/Compilation.js

@@ -2424,9 +2424,10 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 		let statNew = 0;
 		/**
 		 * @param {Module} module module
-		 * @returns {{ modules?: Map<Module, string | number | undefined>, blocks?: (string | number)[] }} references
+		 * @returns {{ id: string | number, modules?: Map<Module, string | number | undefined>, blocks?: (string | number)[] }} references
 		 */
 		const computeReferences = module => {
+			const id = chunkGraph.getModuleId(module);
 			/** @type {Map<Module, string | number | undefined>} */
 			let modules = undefined;
 			/** @type {(string | number)[] | undefined} */
@@ -2454,16 +2455,18 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 					queue.push.apply(queue, block.blocks);
 				}
 			}
-			return { modules, blocks };
+			return { id, modules, blocks };
 		};
 		/**
 		 * @param {Module} module module
 		 * @param {Object} references references
+		 * @param {string | number} references.id id
 		 * @param {Map<Module, string | number>=} references.modules modules
 		 * @param {(string | number)[]=} references.blocks blocks
 		 * @returns {boolean} ok?
 		 */
-		const compareReferences = (module, { modules, blocks }) => {
+		const compareReferences = (module, { id, modules, blocks }) => {
+			if (id !== chunkGraph.getModuleId(module)) return false;
 			if (modules !== undefined) {
 				for (const [module, id] of modules) {
 					if (chunkGraph.getModuleId(module) !== id) return false;
@@ -2489,7 +2492,7 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 		};
 
 		for (const [module, memCache] of moduleMemCaches) {
-			/** @type {{ references: { modules?: Map<Module, string | number | undefined>, blocks?: (string | number)[]}, memCache: WeakTupleMap<any[], any> }} */
+			/** @type {{ references: { id: string | number, modules?: Map<Module, string | number | undefined>, blocks?: (string | number)[]}, memCache: WeakTupleMap<any[], any> }} */
 			const cache = memCache.get(key);
 			if (cache === undefined) {
 				const memCache2 = new WeakTupleMap();

test/watchCases/cache/changing-module-id/0/index.js

@@ -2,8 +2,9 @@ import value from "./module";
 import value2 from "./unrelated";
 import value3 from "./other-module";
 
-it("should work when modules change ids", () => {
+it("should work when modules change ids", async () => {
 	expect(value).toBe(42);
 	expect(value2).toBe(42);
 	expect(value3).toBe(42 + +WATCH_STEP);
+	expect(import("./module?async")).resolves.toEqual(nsObj({ default: 42 }));
 });

test/watchCases/cache/changing-module-id/0/unrelated.js

@@ -1 +1,2 @@
 export { default } from "./module";
+if (Math.random() < 0) import("./module?async");

test/watchCases/cache/changing-module-id/1/other-layer.js

@@ -1 +1,2 @@
 export { default } from "./module";
+import "./module?async";

test/watchCases/cache/changing-module-id/webpack.config.js

@@ -5,7 +5,8 @@ module.exports = {
 		type: "memory"
 	},
 	optimization: {
-		sideEffects: false
+		sideEffects: false,
+		providedExports: false
 	},
 	module: {
 		rules: [
@@ -16,6 +17,7 @@ module.exports = {
 		]
 	},
 	experiments: {
+		cacheUnaffected: true,
 		layers: true
 	}
 };