Merge pull request #15315 from webpack/fix/issue-13022

update topLevelDeclarations for ConcatenatedModule

lib/Compilation.js

@@ -182,6 +182,7 @@ const { isSourceEqual } = require("./util/source");
 
 /**
  * @typedef {Object} ChunkHashContext
+ * @property {CodeGenerationResults} codeGenerationResults results of code generation
  * @property {RuntimeTemplate} runtimeTemplate the runtime template
  * @property {ModuleGraph} moduleGraph the module graph
  * @property {ChunkGraph} chunkGraph the chunk graph
@@ -4137,6 +4138,7 @@ This prevents using hashes of each other and should be avoided.`);
 				chunk.updateHash(chunkHash, chunkGraph);
 				this.hooks.chunkHash.call(chunk, chunkHash, {
 					chunkGraph,
+					codeGenerationResults: this.codeGenerationResults,
 					moduleGraph: this.moduleGraph,
 					runtimeTemplate: this.runtimeTemplate
 				});

lib/javascript/JavascriptModulesPlugin.js

@@ -103,6 +103,7 @@ const printGeneratedCodeForStack = (module, code) => {
 /**
  * @typedef {Object} RenderBootstrapContext
  * @property {Chunk} chunk the chunk
+ * @property {CodeGenerationResults} codeGenerationResults results of code generation
  * @property {RuntimeTemplate} runtimeTemplate the runtime template
  * @property {ModuleGraph} moduleGraph the module graph
  * @property {ChunkGraph} chunkGraph the chunk graph
@@ -332,6 +333,7 @@ class JavascriptModulesPlugin {
 								{
 									hash: "0000",
 									chunk,
+									codeGenerationResults: context.codeGenerationResults,
 									chunkGraph: context.chunkGraph,
 									moduleGraph: context.moduleGraph,
 									runtimeTemplate: context.runtimeTemplate
@@ -344,6 +346,7 @@ class JavascriptModulesPlugin {
 				compilation.hooks.contentHash.tap("JavascriptModulesPlugin", chunk => {
 					const {
 						chunkGraph,
+						codeGenerationResults,
 						moduleGraph,
 						runtimeTemplate,
 						outputOptions: {
@@ -361,6 +364,7 @@ class JavascriptModulesPlugin {
 							{
 								hash: "0000",
 								chunk,
+								codeGenerationResults,
 								chunkGraph: compilation.chunkGraph,
 								moduleGraph: compilation.moduleGraph,
 								runtimeTemplate: compilation.runtimeTemplate
@@ -373,6 +377,7 @@ class JavascriptModulesPlugin {
 					}
 					hooks.chunkHash.call(chunk, hash, {
 						chunkGraph,
+						codeGenerationResults,
 						moduleGraph,
 						runtimeTemplate
 					});
@@ -978,7 +983,13 @@ class JavascriptModulesPlugin {
 	 * @returns {{ header: string[], beforeStartup: string[], startup: string[], afterStartup: string[], allowInlineStartup: boolean }} the generated source of the bootstrap code
 	 */
 	renderBootstrap(renderContext, hooks) {
-		const { chunkGraph, moduleGraph, chunk, runtimeTemplate } = renderContext;
+		const {
+			chunkGraph,
+			codeGenerationResults,
+			moduleGraph,
+			chunk,
+			runtimeTemplate
+		} = renderContext;
 
 		const runtimeRequirements = chunkGraph.getTreeRuntimeRequirements(chunk);
 
@@ -1102,8 +1113,18 @@ class JavascriptModulesPlugin {
 						);
 						result.allowInlineStartup = false;
 					}
+
+					let data;
+					if (codeGenerationResults.has(entryModule, chunk.runtime)) {
+						const result = codeGenerationResults.get(
+							entryModule,
+							chunk.runtime
+						);
+						data = result.data;
+					}
 					if (
 						result.allowInlineStartup &&
+						(!data || !data.get("topLevelDeclarations")) &&
 						(!entryModule.buildInfo ||
 							!entryModule.buildInfo.topLevelDeclarations)
 					) {

lib/library/AssignLibraryPlugin.js

@@ -222,9 +222,15 @@ class AssignLibraryPlugin extends AbstractLibraryPlugin {
 	 * @param {LibraryContext<T>} libraryContext context
 	 * @returns {string | undefined} bailout reason
 	 */
-	embedInRuntimeBailout(module, { chunk }, { options, compilation }) {
+	embedInRuntimeBailout(
+		module,
+		{ chunk, codeGenerationResults },
+		{ options, compilation }
+	) {
+		const { data } = codeGenerationResults.get(module, chunk.runtime);
 		const topLevelDeclarations =
-			module.buildInfo && module.buildInfo.topLevelDeclarations;
+			(data && data.get("topLevelDeclarations")) ||
+			(module.buildInfo && module.buildInfo.topLevelDeclarations);
 		if (!topLevelDeclarations)
 			return "it doesn't tell about top level declarations.";
 		const fullNameResolved = this._getResolvedFullName(

lib/optimize/ConcatenatedModule.js

@@ -822,10 +822,6 @@ class ConcatenatedModule extends Module {
 				const topLevelDeclarations = this.buildInfo.topLevelDeclarations;
 				if (topLevelDeclarations !== undefined) {
 					for (const decl of m.buildInfo.topLevelDeclarations) {
-						// reserved names will always be renamed
-						if (RESERVED_NAMES.has(decl)) continue;
-						// TODO actually this is incorrect since with renaming there could be more
-						// We should do the renaming during build
 						topLevelDeclarations.add(decl);
 					}
 				}
@@ -1113,6 +1109,8 @@ class ConcatenatedModule extends Module {
 
 		// List of all used names to avoid conflicts
 		const allUsedNames = new Set(RESERVED_NAMES);
+		// Updated Top level declarations are created by renaming
+		const topLevelDeclarations = new Set();
 
 		// List of additional names in scope for module references
 		/** @type {Map<string, { usedNames: Set<string>, alreadyCheckedScopes: Set<TODO> }>} */
@@ -1257,6 +1255,7 @@ class ConcatenatedModule extends Module {
 							);
 							allUsedNames.add(newName);
 							info.internalNames.set(name, newName);
+							topLevelDeclarations.add(newName);
 							const source = info.source;
 							const allIdentifiers = new Set(
 								references.map(r => r.identifier).concat(variable.identifiers)
@@ -1283,6 +1282,7 @@ class ConcatenatedModule extends Module {
 						} else {
 							allUsedNames.add(name);
 							info.internalNames.set(name, name);
+							topLevelDeclarations.add(name);
 						}
 					}
 					let namespaceObjectName;
@@ -1300,6 +1300,7 @@ class ConcatenatedModule extends Module {
 						allUsedNames.add(namespaceObjectName);
 					}
 					info.namespaceObjectName = namespaceObjectName;
+					topLevelDeclarations.add(namespaceObjectName);
 					break;
 				}
 				case "external": {
@@ -1311,6 +1312,7 @@ class ConcatenatedModule extends Module {
 					);
 					allUsedNames.add(externalName);
 					info.name = externalName;
+					topLevelDeclarations.add(externalName);
 					break;
 				}
 			}
@@ -1323,6 +1325,7 @@ class ConcatenatedModule extends Module {
 				);
 				allUsedNames.add(externalNameInterop);
 				info.interopNamespaceObjectName = externalNameInterop;
+				topLevelDeclarations.add(externalNameInterop);
 			}
 			if (
 				info.module.buildMeta.exportsType === "default" &&
@@ -1336,6 +1339,7 @@ class ConcatenatedModule extends Module {
 				);
 				allUsedNames.add(externalNameInterop);
 				info.interopNamespaceObject2Name = externalNameInterop;
+				topLevelDeclarations.add(externalNameInterop);
 			}
 			if (
 				info.module.buildMeta.exportsType === "dynamic" ||
@@ -1349,6 +1353,7 @@ class ConcatenatedModule extends Module {
 				);
 				allUsedNames.add(externalNameInterop);
 				info.interopDefaultAccessName = externalNameInterop;
+				topLevelDeclarations.add(externalNameInterop);
 			}
 		}
 
@@ -1618,6 +1623,7 @@ ${defineGetters}`
 		const data = new Map();
 		if (chunkInitFragments.length > 0)
 			data.set("chunkInitFragments", chunkInitFragments);
+		data.set("topLevelDeclarations", topLevelDeclarations);
 
 		/** @type {CodeGenerationResult} */
 		const resultEntry = {

test/__snapshots__/StatsTestCases.basictest.js.snap

@@ -1129,7 +1129,7 @@ chunk (runtime: main) trees.js (trees) 215 bytes [rendered]
 `;
 
 exports[`StatsTestCases should print correct stats for ignore-warnings 1`] = `
-"asset main.js 1.37 KiB [emitted] (name: main)
+"asset main.js 989 bytes [emitted] (name: main)
 orphan modules 617 bytes [orphan] 9 modules
 ./index.js + 9 modules 790 bytes [built] [code generated]
 

test/configCases/concatenate-modules/issue-13022/a.js

@@ -0,0 +1,4 @@
+const doc = console;
+const setTimeout = 1;
+
+export default 1;

test/configCases/concatenate-modules/issue-13022/index.js

@@ -0,0 +1,11 @@
+import "./a";
+
+setTimeout(() => {}, 0);
+
+const doc = console;
+
+export default 1;
+
+it("should compile and run", () => {
+	expect(doc).toBe(console);
+});

test/configCases/concatenate-modules/issue-13022/webpack.config.js

@@ -0,0 +1,29 @@
+const path = require("path");
+
+/** @type {import("../../../../").Configuration[]} */
+module.exports = [
+	{
+		entry: {
+			index: path.resolve(__dirname, "./index.js")
+		},
+		output: {
+			library: "[name]",
+			libraryExport: "default"
+		},
+		optimization: {
+			concatenateModules: true
+		}
+	},
+	{
+		entry: {
+			index: path.resolve(__dirname, "./index.js")
+		},
+		output: {
+			library: "[name]_doc",
+			libraryExport: "default"
+		},
+		optimization: {
+			concatenateModules: true
+		}
+	}
+];

types.d.ts

@@ -1049,6 +1049,11 @@ declare abstract class ChunkGroup {
 }
 type ChunkGroupOptions = RawChunkGroupOptions & { name?: string };
 declare interface ChunkHashContext {
+	/**
+	 * results of code generation
+	 */
+	codeGenerationResults: CodeGenerationResults;
+
 	/**
 	 * the runtime template
 	 */
@@ -9221,6 +9226,11 @@ declare interface RenderBootstrapContext {
 	 */
 	chunk: Chunk;
 
+	/**
+	 * results of code generation
+	 */
+	codeGenerationResults: CodeGenerationResults;
+
 	/**
 	 * the runtime template
 	 */