src: Improve types for natives like String.

Author: zorbyte

example/test.ts

@@ -6,8 +6,13 @@ class Test {
 
 const m = new PubSub();
 
-m.subscribe(Test, (b) => {
-  console.log(b);
+m.subscribe(Test, (t) => {
+  console.log(t);
 });
 
+m.subscribe(String, (s) => {
+  console.log(s);
+});
+
+m.publish("sdfg");
 m.publish(new Test());

pubsub.ts

@@ -4,7 +4,10 @@ export type Constructable<T> = { new (): T };
 export class PubSub {
   private subscribers = new Map<unknown, Subscriber<any>[]>();
 
-  public subscribe<T>(subscriptable: Constructable<T>, cb: Subscriber<T>) {
+  public subscribe<T extends Constructable<unknown>>(
+    subscriptable: T,
+    cb: Subscriber<InstanceType<T>>,
+  ) {
     const subs = this.subscribers.get(subscriptable) ?? [];
     subs.push(cb);
     this.subscribers.set(subscriptable, subs);