refactor: clean dev server code

packages/rspack-dev-server/src/alias.ts

@@ -0,0 +1,34 @@
+const RESOLVER_MAP: Record<string, typeof require.resolve> = {};
+export const addResolveAlias = (
+	name: string,
+	aliasMap: Record<string, string>
+) => {
+	if (RESOLVER_MAP[name]) {
+		throw new Error(`Should not add resolve alias to ${name} again.`);
+	}
+	const m = require.cache[require.resolve(name)];
+	if (!m) {
+		throw new Error("Failed to resolve webpack-dev-server.");
+	}
+	RESOLVER_MAP[name] = m.require.resolve;
+	m.require.resolve = ((id: string, options?: any) =>
+		aliasMap[id] ||
+		RESOLVER_MAP[name]!.apply(m.require, [
+			id,
+			options
+		])) as typeof require.resolve;
+};
+
+export const removeResolveAlias = (name: string) => {
+	if (!RESOLVER_MAP[name]) {
+		throw new Error(`Should add resolve alias to ${name} before removing.`);
+	}
+	const m = require.cache[require.resolve(name)];
+	if (!m) {
+		throw new Error("Failed to resolve webpack-dev-server");
+	}
+	if (RESOLVER_MAP[name]) {
+		m.require.resolve = RESOLVER_MAP[name]!;
+		delete RESOLVER_MAP[name];
+	}
+};