Merge pull request #42 from takker99/use-derived-class

👍 Use a derived class at listener arguments
scrapbox-jp · Mar 23, 2023 · 29123a1 · 29123a1
2 parents f26769f + 9fe855c
commit 29123a1
Showing 1 changed file with 10 additions and 5 deletions.
diff --git a/baseStore.ts b/baseStore.ts
@@ -1,12 +1,17 @@
-export type BaseStoreListenerInit = { store: BaseStore; event: string };
-export type BaseStoreListener = (init: BaseStoreListenerInit) => void;
+export type BaseStoreListenerInit<Derived extends BaseStore> = {
+  store: Derived;
+  event: string;
+};
+export type BaseStoreListener<Derived extends BaseStore> = (
+  init: BaseStoreListenerInit<Derived>,
+) => void;
 export declare class BaseStore {
   constructor();
 
-  public addChangeListener(listener: BaseStoreListener): void;
-  public removeChangeListener(listener: BaseStoreListener): void;
+  public addChangeListener(listener: BaseStoreListener<this>): void;
+  public removeChangeListener(listener: BaseStoreListener<this>): void;
   public emitChange(event: string): void;
   public get listenersCount(): number;
 
-  private _onChangeListeners: BaseStoreListener[];
+  private _onChangeListeners: BaseStoreListener<this>[];
 }