test: improve defer the same module (#20479)

alexander-akait · web-flow · commit 82a0efbc06f9 · 2026-02-19T20:45:33.000+03:00
diff --git a/lib/dependencies/ImportPhase.js b/lib/dependencies/ImportPhase.js
@@ -27,12 +27,16 @@ const ImportPhase = Object.freeze({
 
 /**
  * @typedef {object} ImportPhaseUtils
+ * @property {(phase: ImportPhaseType) => boolean} isEvaluation true if phase is evaluation
  * @property {(phase: ImportPhaseType) => boolean} isDefer true if phase is defer
  * @property {(phase: ImportPhaseType) => boolean} isSource true if phase is source
  */
 
 /** @type {ImportPhaseUtils} */
 const ImportPhaseUtils = {
+	isEvaluation(phase) {
+		return phase === ImportPhase.Evaluation;
+	},
 	isDefer(phase) {
 		return phase === ImportPhase.Defer;
 	},
diff --git a/test/configCases/defer-import/same-module/index.js b/test/configCases/defer-import/same-module/index.js
@@ -0,0 +1,9 @@
+import * as mod1 from "./module.js";
+import defer * as mod2 from "./module.js";
+
+it("should generate different runtime code for the same module", () => {
+	expect(mod1.default).toBe(mod2.default);
+	expect(mod1).toBe(mod2);
+	// Test itself + module
+	expect(Object.keys(__webpack_modules__).length).toBe(2);
+});
diff --git a/test/configCases/defer-import/same-module/module.js b/test/configCases/defer-import/same-module/module.js
@@ -0,0 +1 @@
+export default "ok";
diff --git a/test/configCases/defer-import/same-module/webpack.config.js b/test/configCases/defer-import/same-module/webpack.config.js
@@ -0,0 +1,12 @@
+"use strict";
+
+/** @type {import("../../../../").Configuration} */
+module.exports = {
+	target: [`async-node${process.versions.node.split(".").map(Number)[0]}`],
+	optimization: {
+		concatenateModules: false
+	},
+	experiments: {
+		deferImport: true
+	}
+};
