Jason Tudisco
6ebe02ad56
Four variants of the same sync library (IndexedDB, NeDB, SQLite WASM, sql.js) plus a paste-bin demo app for testing multi-browser sync via shared folders. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
34 lines
778 B
TypeScript
34 lines
778 B
TypeScript
import type { SyncDBEventName, SyncDBEventHandler } from './types.js';
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export class Emitter {
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private listeners = new Map<SyncDBEventName, Set<SyncDBEventHandler>>();
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on(event: SyncDBEventName, handler: SyncDBEventHandler): () => void {
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let set = this.listeners.get(event);
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if (!set) {
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set = new Set();
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this.listeners.set(event, set);
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}
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set.add(handler);
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return () => {
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set!.delete(handler);
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};
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}
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emit(event: SyncDBEventName, ...args: unknown[]): void {
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const set = this.listeners.get(event);
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if (!set) return;
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for (const fn of set) {
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try {
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fn(...args);
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} catch {
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// listener errors must not break the library
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}
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}
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}
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removeAll(): void {
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this.listeners.clear();
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}
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}
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