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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | 4x 4x 4x 4x 4x | const buildTypedEventTargetType = () => {
const klass = class TypedEventTarget<EventMap> {
addEventListener<K extends keyof EventMap>(
type: K,
listener: (this: HTMLElement, ev: EventMap[K]) => any,
options?: boolean | AddEventListenerOptions,
): void;
addEventListener(
type: string,
callback: EventListenerOrEventListenerObject | null,
options?: AddEventListenerOptions | boolean,
): void;
addEventListener(): void {}
dispatchEvent(event: EventMap[keyof EventMap]): boolean;
dispatchEvent(event: Event): boolean;
dispatchEvent(): boolean {
return true;
}
removeEventListener<K extends keyof EventMap>(
type: K,
listener: (this: HTMLElement, ev: EventMap[K]) => any,
options?: boolean | EventListenerOptions,
): void;
removeEventListener(
type: string,
callback: EventListenerOrEventListenerObject | null,
options?: EventListenerOptions | boolean,
): void;
removeEventListener(): void {}
};
return EventTarget as unknown as typeof klass;
};
export const TypedEventTarget = buildTypedEventTargetType();
export interface TypedEventTarget<EventMap> {
addEventListener<K extends keyof EventMap>(
type: K,
listener: (this: HTMLElement, ev: EventMap[K]) => any,
options?: boolean | AddEventListenerOptions,
): void;
addEventListener(
type: string,
callback: EventListenerOrEventListenerObject | null,
options?: AddEventListenerOptions | boolean,
): void;
dispatchEvent(event: EventMap[keyof EventMap]): boolean;
dispatchEvent(event: Event): boolean;
removeEventListener<K extends keyof EventMap>(
type: K,
listener: (this: HTMLElement, ev: EventMap[K]) => any,
options?: boolean | EventListenerOptions,
): void;
removeEventListener(
type: string,
callback: EventListenerOrEventListenerObject | null,
options?: EventListenerOptions | boolean,
): void;
}
export class SubscriptionEventTarget<EventMap> extends TypedEventTarget<EventMap> {
public subscribe<K extends keyof EventMap>(type: K, listener: (ev: EventMap[K]) => void): () => void {
this.addEventListener(type, listener);
return () => this.removeEventListener(type, listener);
}
}
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