Use ReturnType<typeof setInterval> for timerIds (#5060)

* Use ReturnType<typeof setInterval> for timerIds

* Remove as number casts for clearInterval

packages/api/src/base/Init.ts

@@ -29,8 +29,7 @@ function textToString (t: Text): string {
 }
 
 export abstract class Init<ApiType extends ApiTypes> extends Decorate<ApiType> {
-  // Browser/Deno = number, Node = Timeout
+  #healthTimer: ReturnType<typeof setInterval> | null = null;
-  #healthTimer: unknown | null = null;
 
   #registries: VersionedRegistry<ApiType>[] = [];
 
@@ -374,8 +373,7 @@ export abstract class Init<ApiType extends ApiTypes> extends Decorate<ApiType> {
 
   private _unsubscribeHealth (): void {
     if (this.#healthTimer) {
-      // different method signatures for Node vs Browser/Deno
+      clearInterval(this.#healthTimer);
-      clearInterval(this.#healthTimer as number);
       this.#healthTimer = null;
     }
   }

packages/rpc-provider/src/mock/index.ts

@@ -44,8 +44,7 @@ export class MockProvider implements ProviderInterface {
 
   private emitter = new EventEmitter();
 
-  // Browser/Deno = number, Node = Timeout
+  private intervalId?: ReturnType<typeof setInterval> | null;
-  private intervalId?: unknown | null;
 
   public isUpdating = true;
 
@@ -110,8 +109,7 @@ export class MockProvider implements ProviderInterface {
   // eslint-disable-next-line @typescript-eslint/require-await
   public async disconnect (): Promise<void> {
     if (this.intervalId) {
-      // different method signatures for Node vs Browser/Deno
+      clearInterval(this.intervalId);
-      clearInterval(this.intervalId as number);
       this.intervalId = null;
     }
   }

packages/rpc-provider/src/ws/index.ts

@@ -106,8 +106,7 @@ export class WsProvider implements ProviderInterface {
 
   #subscriptions: Record<string, WsStateSubscription> = {};
 
-  // Browser/Deno = number, Node = Timeout
+  #timeoutId?: ReturnType<typeof setInterval> | null = null;
-  #timeoutId?: unknown | null = null;
 
   #websocket: WebSocket | null;
 
@@ -431,8 +430,7 @@ export class WsProvider implements ProviderInterface {
     }
 
     if (this.#timeoutId) {
-      // different method signatures for Node vs Browser/Deno
+      clearInterval(this.#timeoutId);
-      clearInterval(this.#timeoutId as number);
       this.#timeoutId = null;
     }