refactor: update constructor to make compiler parameter optional for plugin usage

Author: bjohansebas

lib/Server.js

@@ -338,7 +338,7 @@ const pluginName = "webpack-dev-server";
 class Server {
   /**
    * @param {Configuration<A, S>} options options
-   * @param {Compiler | MultiCompiler} compiler compiler
+   * @param {(Compiler | MultiCompiler)=} compiler compiler, omitted when the server is used as a plugin via `apply()`
    */
   constructor(options, compiler) {
     validate(/** @type {Schema} */ (schema), options, {
@@ -593,7 +593,7 @@ class Server {
     // client. `target: false` is `null` everywhere, so it is excluded.
     return Boolean(
       platform.web ||
-        platform?.universal ||
+        /** @type {{ universal?: boolean | null }} */ (platform)?.universal ||
         (compiler.options.target !== false &&
           platform.web === null &&
           platform.node === null),

types/lib/Server.d.ts

@@ -1496,9 +1496,12 @@ declare class Server<
   private static isWebTarget;
   /**
    * @param {Configuration<A, S>} options options
-   * @param {Compiler | MultiCompiler} compiler compiler
+   * @param {(Compiler | MultiCompiler)=} compiler compiler, omitted when the server is used as a plugin via `apply()`
    */
-  constructor(options: Configuration<A, S>, compiler: Compiler | MultiCompiler);
+  constructor(
+    options: Configuration<A, S>,
+    compiler?: (Compiler | MultiCompiler) | undefined,
+  );
   compiler:
     | import("webpack").Compiler
     | import("webpack").MultiCompiler