Add MultiHook and _pluginCompat to Tapable (#24527)

* Fix Tapable types

* ..

* Clean up

* Undo instance member change

* Add constructor to Hookmap

types/tapable/index.d.ts

@@ -9,6 +9,9 @@ export declare abstract class Tapable {
         [propName: string]: Tapable.Handler[]
     }
 
+    /** @deprecated Private internals. Do not use directly */
+    _pluginCompat: Hook;
+
     /**
      * @deprecated Tapable.plugin is deprecated. Use new API on `.hooks` instead
      * Register plugin(s)
@@ -275,7 +278,9 @@ export class HookInterceptor {
     context: boolean;
 }
 
+/** A HookMap is a helper class for a Map with Hooks */
 export class HookMap<T1 = any, T2 = any, T3 = any> {
+    constructor(fn: () => Hook);
     get: (key: any) => Hook<T1, T2, T3> | undefined;
     for: (key: any) => Hook<T1, T2, T3>;
     tap: (key: any, name: string | Tap, fn: (arg1: T1, arg2: T2, arg3: T3, ...args: any[]) => any) => void;
@@ -287,3 +292,16 @@ export class HookMap<T1 = any, T2 = any, T3 = any> {
 export class HookMapInterceptor<T1 = any, T2 = any, T3 = any> {
     factory: (key: any, hook: Hook<T1, T2, T3>) => Hook<T1, T2, T3>;
 }
+
+/**
+ *  A helper Hook-like class to redirect taps to multiple other hooks
+ *
+ * ```
+ * const { MultiHook } = require("tapable");
+ *
+ * this.hooks.allHooks = new MultiHook([this.hooks.hookA, this.hooks.hookB]);
+ * ```
+ */
+export class MultiHook {
+    constructor(hooks: Hook[])
+}

types/tapable/tapable-tests.ts

@@ -1,4 +1,4 @@
-import {Tapable} from "tapable";
+import {Tapable, MultiHook, SyncHook} from "tapable";
 
 class DllPlugin {
     apply(compiler: Compiler) {
@@ -43,3 +43,5 @@ compiler.applyPluginsAsyncWaterfall('doSomething', 'a', callback);
 compiler.applyPluginsParallel('doSomething', 'a', 'b');
 compiler.applyPluginsParallelBailResult('doSomething', 'a', 'b');
 compiler.applyPluginsParallelBailResult1('doSomething', 'a', callback);
+
+const multi = new MultiHook([new SyncHook(['hi'])]);