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Event Map

Event-map EventEmitter: one emitter, per-event payload types — including payload-less `void` events — declared as an object type argument, checked at compile time against string-literal event names.

class Downloader extends EventEmitter<{ progress: number; chunk: string; done: void; error: Error }> {
  fetchAll(): void {
    this.emit("progress", 0);
    this.emit("chunk", "first part");
    this.emit("progress", 50);
    this.emit("chunk", "second part");
    this.emit("progress", 100);
    this.emit("done");
  }
}

const d = new Downloader();
let received = "";
d.on("progress", (pct) => { console.log("progress: " + pct + "%"); });
d.on("chunk", (part) => { received = received + part + " "; });
d.on("done", () => { console.log("received:", received.trim()); });
d.fetchAll();

console.log("is an EventEmitter:", d instanceof EventEmitter);
View source on GitHubexamples/eventemitter/event_map.ts
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