Typed Events are an alternative event system designed for TypeScript. While there's obviously nothing functionally wrong with the standard EventEmitter system, it was built for JavaScript before TypeScript was even conceived. The objective of this library is simply to offer an event system which feels more natural to TypeScript.
Install via npm:
$ npm install @kiruse/typed-events
import Event from '@kiruse/typed-events';
// First generic parameter is the `event.args` field, second is the optional `event.result` field.
const event = Event<{ foo: string }, number>();
const unsub = event(e => {
console.log(e.args);
e.result ??= 42;
e.result++;
});
event.once(e => {
e.result ??= 42;
e.result /= 2;
});
const e = await event.emit({ foo: 'bar' });
console.log(e.result); // 21.5
unsub();