@@ -143,14 +143,21 @@ const getModuleLocalExports = (module, cache) => {
 /**
  * Why a module's exported module-level bindings cannot move to the chunk's scope.
  * @param {Module} module the module declaring them
+ * @param {Module} entry the entry module exporting them
  * @param {ESMLiveExportDependency} declaration one of its declarations
  * @param {Chunk} chunk the library's chunk
  * @param {ChunkGraph} chunkGraph the chunk graph
  * @returns {string | null} the reason, empty where they are live already, null where they can move
  */
-const getHoistRefusal = (module, declaration, chunk, chunkGraph) => {
+const getHoistRefusal = (module, entry, declaration, chunk, chunkGraph) => {
 	// A concatenation puts its modules' bindings in one scope already.
-	if (module.is("concatenated")) return "";
+	if (
+		module.is("concatenated") ||
+		(entry !== module &&
+			someInIterable(entry.getSourceModules(), (source) => source === module))
+	) {
+		return "";
+	}
 	if (declaration.readByEval) {
 		return "the module calls eval(), which reads a binding by the name it was declared with";
 	}
@@ -323,6 +330,7 @@ class ModuleLibraryPlugin extends AbstractLibraryPlugin {
 							if (refusal === undefined) {
 								refusal = getHoistRefusal(
 									module,
+									entry,
 									declaration,
 									chunk,
 									chunkGraph
 
@@ -9,4 +9,7 @@ it("should keep exporting what a module in another chunk holds", () => {
 it("should leave a module reading its bindings through eval as it is", () => {
 	expect(library.readEvaluated()).toBe(1);
 	expect(library.evaluated).toBe(1);
+	library.setEvaluated(2);
+	expect(library.readEvaluated()).toBe(2);
+	expect(library.evaluated).toBe(1);
 });
@@ -1,2 +1,2 @@
 export { shared, bumpShared } from "./shared.js";
-export { evaluated, readEvaluated } from "./evaluated.js";
+export { evaluated, readEvaluated, setEvaluated } from "./evaluated.js";
@@ -34,7 +34,32 @@ module.exports = [
 		new webpack.DefinePlugin({
 			GLOBAL_COUNTER: "counter",
 			MINIFIED: JSON.stringify(Boolean(optimization.minimize))
-		})
+		}),
+		/**
+		 * Fails the build when a module whose bindings are live reports them as copies.
+		 * @this {import("../../../../").Compiler} the compiler
+		 */
+		function noCopyBailouts() {
+			this.hooks.compilation.tap("test", (compilation) => {
+				compilation.hooks.afterSeal.tap("test", () => {
+					for (const module of compilation.modules) {
+						for (const source of module.getSourceModules()) {
+							for (const reason of compilation.moduleGraph.getOptimizationBailout(
+								source
+							)) {
+								if (typeof reason === "string" && reason.includes("copies")) {
+									compilation.errors.push(
+										new webpack.WebpackError(
+											`${source.identifier()}: ${reason}`
+										)
+									);
+								}
+							}
+						}
+					}
+				});
+			});
+		}
 	],
 	optimization
 }));
@@ -1,4 +1,8 @@
 "use strict";
 
-// Native top-level await is required when the harness imports the library.
-module.exports = () => Number(process.versions.node.split(".")[0]) >= 14;
+// The generated library uses top-level await, supported by Node.js 14.8 onward.
+/** @returns {boolean} whether the runtime can execute the library */
+module.exports = function filter() {
+	const [major, minor] = process.versions.node.split(".").map(Number);
+	return major > 14 || (major === 14 && minor >= 8);
+};
Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,2 @@`
`1`	`1`	`export { shared, bumpShared } from "./shared.js";`
`2`		`-export { evaluated, readEvaluated } from "./evaluated.js";`
	`2`	`+export { evaluated, readEvaluated, setEvaluated } from "./evaluated.js";`