fix: fix chunk assignment for deoptimized module with dynamic import (#6306)

Co-authored-by: Lukas Taegert-Atkinson <lukastaegert@users.noreply.github.com>

Author: JoaoBrlt

src/utils/chunkAssignment.ts

@@ -425,7 +425,11 @@ function getDynamicallyDependentEntriesByDynamicEntry(
 			getDynamicImporters(dynamicEntry),
 			dynamicEntry.implicitlyLoadedAfter
 		])) {
-			for (const entry of dependentEntriesByModule.get(importer)!) {
+			const importerEntries = dependentEntriesByModule.get(importer);
+			if (!importerEntries) {
+				continue;
+			}
+			for (const entry of importerEntries) {
 				dynamicallyDependentEntries.add(entry);
 			}
 		}

test/chunking-form/samples/deoptimized-module-with-dynamic-import/_config.js

@@ -0,0 +1,19 @@
+const path = require('node:path');
+
+module.exports = defineTest({
+	description: 'deoptimized module with dynamic import',
+	options: {
+		plugins: [
+			{
+				resolveId(id) {
+					if (id === './lazy-loader.js') {
+						return {
+							id: path.resolve('./lazy-loader.js'),
+							moduleSideEffects: false
+						};
+					}
+				}
+			}
+		]
+	}
+});

test/chunking-form/samples/deoptimized-module-with-dynamic-import/_expected/amd/main.js

@@ -0,0 +1,13 @@
+define(['exports'], (function (exports) { 'use strict';
+
+	const value = 42;
+
+	console.log(value);
+
+	var cjs = /*#__PURE__*/Object.freeze({
+		__proto__: null
+	});
+
+	exports.cjs = cjs;
+
+}));

test/chunking-form/samples/deoptimized-module-with-dynamic-import/_expected/cjs/main.js

@@ -0,0 +1,11 @@
+'use strict';
+
+const value = 42;
+
+console.log(value);
+
+var cjs = /*#__PURE__*/Object.freeze({
+	__proto__: null
+});
+
+exports.cjs = cjs;

test/chunking-form/samples/deoptimized-module-with-dynamic-import/_expected/es/main.js

@@ -0,0 +1,9 @@
+const value = 42;
+
+console.log(value);
+
+var cjs = /*#__PURE__*/Object.freeze({
+	__proto__: null
+});
+
+export { cjs as c };

test/chunking-form/samples/deoptimized-module-with-dynamic-import/_expected/system/main.js

@@ -0,0 +1,17 @@
+System.register([], (function (exports) {
+	'use strict';
+	return {
+		execute: (function () {
+
+			const value = 42;
+
+			console.log(value);
+
+			var cjs = /*#__PURE__*/Object.freeze({
+				__proto__: null
+			});
+			exports("c", cjs);
+
+		})
+	};
+}));

test/chunking-form/samples/deoptimized-module-with-dynamic-import/a.js

@@ -0,0 +1,9 @@
+import { fn } from './lazy-loader.js';
+
+const x = fn;
+
+function loadCjs() {
+	return import('./cjs.js');
+}
+
+export const value = 42;

test/chunking-form/samples/deoptimized-module-with-dynamic-import/cjs.js

@@ -0,0 +1 @@
+export const cjs = 'cjs-value';

test/chunking-form/samples/deoptimized-module-with-dynamic-import/lazy-loader.js

@@ -0,0 +1,3 @@
+export function fn() {}
+
+import('./cjs.js');

test/chunking-form/samples/deoptimized-module-with-dynamic-import/main.js

@@ -0,0 +1,2 @@
+import { value } from './a.js';
+console.log(value);