handle more cases with an regexp

lib/config/defaults.js

@@ -704,11 +704,8 @@ const applyOutputDefaults = (
 			"type" in library
 				? library.name
 				: /** @type {LibraryName=} */ (library);
-		const excludePlaceholders = ["[name]"];
 		if (Array.isArray(libraryName)) {
-			return libraryName
-				.filter(item => !excludePlaceholders.includes(item))
-				.join(".");
+			return libraryName.join(".");
 		} else if (typeof libraryName === "object") {
 			return getLibraryName(libraryName.root);
 		} else if (typeof libraryName === "string") {
@@ -718,7 +715,15 @@ const applyOutputDefaults = (
 	};
 
 	F(output, "uniqueName", () => {
-		const libraryName = getLibraryName(output.library);
+		const libraryName = getLibraryName(output.library).replace(
+			/^\[(\\*[\w:]+\\*)\](\.)|(\.)\[(\\*[\w:]+\\*)\](?=\.|$)|\[(\\*[\w:]+\\*)\]/g,
+			(m, a, d1, d2, b, c) => {
+				const content = a || b || c;
+				return content.startsWith("\\") && content.endsWith("\\")
+					? `${d2 || ""}[${content.slice(1, -1)}]${d1 || ""}`
+					: "";
+			}
+		);
 		if (libraryName) return libraryName;
 		const pkgPath = path.resolve(context, "package.json");
 		try {

test/Defaults.unittest.js

@@ -1102,7 +1102,7 @@ describe("Defaults", () => {
 		{
 			output: {
 				library: {
-					name: ["myLib", "[name]"],
+					name: ["my[name]Lib", "[name]", "lib"],
 					type: "var"
 				}
 			}
@@ -1114,10 +1114,10 @@ describe("Defaults", () => {
 
 			@@ ... @@
 			-     "chunkLoadingGlobal": "webpackChunkwebpack",
-		+     "chunkLoadingGlobal": "webpackChunkmyLib",
+			+     "chunkLoadingGlobal": "webpackChunkmyLib_lib",
 			@@ ... @@
 			-     "devtoolNamespace": "webpack",
-		+     "devtoolNamespace": "myLib",
+			+     "devtoolNamespace": "myLib.lib",
 			@@ ... @@
 			-     "enabledLibraryTypes": Array [],
 			+     "enabledLibraryTypes": Array [
@@ -1125,22 +1125,23 @@ describe("Defaults", () => {
 			+     ],
 			@@ ... @@
 			-     "hotUpdateGlobal": "webpackHotUpdatewebpack",
-		+     "hotUpdateGlobal": "webpackHotUpdatemyLib",
+			+     "hotUpdateGlobal": "webpackHotUpdatemyLib_lib",
 			@@ ... @@
 			-     "library": undefined,
 			+     "library": Object {
 			+       "auxiliaryComment": undefined,
 			+       "export": undefined,
 			+       "name": Array [
-		+         "myLib",
+			+         "my[name]Lib",
 			+         "[name]",
+			+         "lib",
 			+       ],
 			+       "type": "var",
 			+       "umdNamedDefine": undefined,
 			+     },
 			@@ ... @@
 			-     "uniqueName": "webpack",
-		+     "uniqueName": "myLib",
+			+     "uniqueName": "myLib.lib",
 		`)
 	);
 	test(
@@ -1149,7 +1150,7 @@ describe("Defaults", () => {
 			output: {
 				library: {
 					name: {
-						root: ["myLib", "[name]"]
+						root: ["[name]", "myLib"]
 					},
 					type: "var"
 				}
@@ -1181,8 +1182,8 @@ describe("Defaults", () => {
 			+       "export": undefined,
 			+       "name": Object {
 			+         "root": Array [
-		+           "myLib",
 			+           "[name]",
+			+           "myLib",
 			+         ],
 			+       },
 			+       "type": "var",
@@ -1193,6 +1194,57 @@ describe("Defaults", () => {
 			+     "uniqueName": "myLib",
 		`)
 	);
+	test(
+		"library.name.root contains escaped placeholder",
+		{
+			output: {
+				library: {
+					name: {
+						root: ["[\\name\\]", "my[\\name\\]Lib[name]", "[\\name\\]"]
+					},
+					type: "var"
+				}
+			}
+		},
+		e =>
+			e.toMatchInlineSnapshot(`
+			- Expected
+			+ Received
+
+			@@ ... @@
+			-     "chunkLoadingGlobal": "webpackChunkwebpack",
+			+     "chunkLoadingGlobal": "webpackChunk_name_my_name_Lib_name_",
+			@@ ... @@
+			-     "devtoolNamespace": "webpack",
+			+     "devtoolNamespace": "[name].my[name]Lib.[name]",
+			@@ ... @@
+			-     "enabledLibraryTypes": Array [],
+			+     "enabledLibraryTypes": Array [
+			+       "var",
+			+     ],
+			@@ ... @@
+			-     "hotUpdateGlobal": "webpackHotUpdatewebpack",
+			+     "hotUpdateGlobal": "webpackHotUpdate_name_my_name_Lib_name_",
+			@@ ... @@
+			-     "library": undefined,
+			+     "library": Object {
+			+       "auxiliaryComment": undefined,
+			+       "export": undefined,
+			+       "name": Object {
+			+         "root": Array [
+			+           "[\\\\name\\\\]",
+			+           "my[\\\\name\\\\]Lib[name]",
+			+           "[\\\\name\\\\]",
+			+         ],
+			+       },
+			+       "type": "var",
+			+       "umdNamedDefine": undefined,
+			+     },
+			@@ ... @@
+			-     "uniqueName": "webpack",
+			+     "uniqueName": "[name].my[name]Lib.[name]",
+		`)
+	);
 	test("target node", { target: "node" }, e =>
 		e.toMatchInlineSnapshot(`
 		- Expected