File size: 1,921 Bytes
4e1096a | 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 | class EventDispatcher {
private syncListeners: Map<string, Array<(event: CustomEvent) => boolean>>;
private asyncListeners: Map<string, Set<(event: CustomEvent) => Promise<void> | void>>;
constructor() {
this.syncListeners = new Map();
this.asyncListeners = new Map();
}
on(event: string, callback: (event: CustomEvent) => Promise<void> | void): void {
if (!this.asyncListeners.has(event)) {
this.asyncListeners.set(event, new Set());
}
this.asyncListeners.get(event)!.add(callback);
}
off(event: string, callback: (event: CustomEvent) => Promise<void> | void): void {
this.asyncListeners.get(event)?.delete(callback);
}
async dispatch(event: string, detail?: unknown): Promise<void> {
const listeners = this.asyncListeners.get(event);
if (listeners) {
const customEvent = new CustomEvent(event, { detail });
for (const listener of listeners) {
await listener(customEvent);
}
}
}
onSync(event: string, callback: (event: CustomEvent) => boolean): void {
if (!this.syncListeners.has(event)) {
this.syncListeners.set(event, []);
}
this.syncListeners.get(event)!.push(callback);
}
offSync(event: string, callback: (event: CustomEvent) => boolean): void {
const listeners = this.syncListeners.get(event);
if (listeners) {
this.syncListeners.set(
event,
listeners.filter((listener) => listener !== callback),
);
}
}
dispatchSync(event: string, detail?: unknown): boolean {
const listeners = this.syncListeners.get(event);
if (listeners) {
const customEvent = new CustomEvent(event, { detail });
for (const listener of [...listeners].reverse()) {
const consumed = listener(customEvent);
if (consumed) {
return true;
}
}
}
return false;
}
}
export const eventDispatcher = new EventDispatcher();
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