fix subtraction of runtimes

fixes #13063

lib/util/runtime.js

@@ -347,7 +347,7 @@ const subtractRuntime = (a, b) => {
 		return undefined;
 	} else if (typeof a === "string") {
 		if (typeof b === "string") {
-			return undefined;
+			return a;
 		} else if (b.has(a)) {
 			return undefined;
 		} else {

test/configCases/side-effects/issue-13063/another.js

@@ -0,0 +1 @@
+require("./vendors").UiSelectButton2();

test/configCases/side-effects/issue-13063/test.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+	findBundle: function () {
+		return ["./vendors.js", "./tst_examples_uiform.js"];
+	}
+};

test/configCases/side-effects/issue-13063/tst_examples_uiform.js

@@ -0,0 +1,4 @@
+it("should not crash", () => {
+	require("./vendors").UiSelectButton();
+	require("./vendors").UiSelectButton2();
+});

test/configCases/side-effects/issue-13063/tst_examples_uitable.js

@@ -0,0 +1,5 @@
+import { UiButton } from "./vendors";
+
+it("should not crash", () => {
+	UiButton();
+});

test/configCases/side-effects/issue-13063/vendors/index.js

@@ -0,0 +1,9 @@
+import uuid from "./uuid";
+import { checkIsNonemptyString } from "./types";
+export { UiSelectButton } from "./select";
+export { UiSelectButton2 } from "./select2";
+
+export function UiButton() {
+	checkIsNonemptyString();
+	uuid();
+}

test/configCases/side-effects/issue-13063/vendors/select.js

@@ -0,0 +1,9 @@
+import uuid from "./uuid";
+import { checkIsNonemptyString } from "./types";
+
+export function UiSelectButton() {
+	checkIsNonemptyString();
+	uuid();
+}
+
+console.log.bind(console);

test/configCases/side-effects/issue-13063/vendors/select2.js

@@ -0,0 +1,7 @@
+import uuid from "./uuid";
+
+export function UiSelectButton2() {
+	uuid();
+}
+
+console.log.bind(console);

test/configCases/side-effects/issue-13063/vendors/types.js

@@ -0,0 +1 @@
+export function checkIsNonemptyString() {}

test/configCases/side-effects/issue-13063/vendors/uuid.js

@@ -0,0 +1 @@
+export default function uuid() {}

test/configCases/side-effects/issue-13063/webpack.config.js

@@ -0,0 +1,26 @@
+module.exports = {
+	entry: {
+		tst_examples_uiform: "./tst_examples_uiform",
+		tst_examples_uitable: "./tst_examples_uitable",
+		another: "./another"
+	},
+	output: {
+		pathinfo: "verbose",
+		filename: "[name].js"
+	},
+	target: "web",
+	optimization: {
+		sideEffects: true,
+		concatenateModules: true,
+		splitChunks: {
+			cacheGroups: {
+				vendors: {
+					chunks: "all",
+					test: /vendors/,
+					enforce: true,
+					name: "vendors"
+				}
+			}
+		}
+	}
+};