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ayemitter
Advanced tools
Readme
A typed easy-to-use event emitter that you can just construct with a event type and start adding handlers.
yarn add ayemitter
Create a EventEmitter
instance typed to whatever your
payload type is, add handlers and emit a new event.
import { EventEmitter } from 'ayemitter';
const emitter = new EventEmitter<string>();
emitter.on(payload => {
console.log('Handler 1 ' + payload);
});
emitter.on(payload => {
console.log('Handler 2 ' + payload);
});
emitter.emit('yup');
// Outputs:
// Handler 1 yup
// Handler 2 yup
If one or more handlers are asynchronous, the emit
call waits for all handlers to finish. All handlers are
invoked at the same time.
import { EventEmitter } from 'ayemitter';
const emitter = new EventEmitter<string>();
emitter.on(async payload => {
// waits for 2 seconds
});
emitter.on(async payload => {
// waits for 1 second
});
emitter.on(async payload => {
// immediately returns
});
emitter.emit('yup').then(() => console.log('Done!'));
// All three handlers are invoked at the same time
// "Done!" is outputted after 2 seconds, i.e. after
// all handlers are finished
interface EventEmitter<EventPayload> {
constructor(options?: EventEmitterOptions<EventPayload>);
get numberOfHandlers(): number;
emit(payload: EventPayload): Promise<void>;
on(handler: EventHandler<EventPayload>): number;
off(handlerId: number): void;
delete(handlerId: number): void;
}
interface EventEmitterOptions<EventPayload = any> {
logger?: (log: string, payload?: EventPayload) => void;
}
type EventHandler<EventPayload> = ((payload: EventPayload) => Promise<void> | void) | null | undefined;
Use in conjunction with ayemitter-hook to use as React hook.
import { EventEmitter } from 'ayemitter';
import { useEventChangeHandler } from 'ayemitter-hook';
const emitter = new EventEmitter<string>();
const Component = () => {
const [state, setState] = useState('state1');
useEventChangeHandler(
emitter,
() => {
console.log('Hello!');
},
[state]
); // state is a dependency
// The handler is rebinded to the emitter everytime the
// handler or a dependency changes.
return; // ...
};
FAQs
A typed easy-to-use event emitter that you can just construct with a event type and start adding handlers.
The npm package ayemitter receives a total of 2 weekly downloads. As such, ayemitter popularity was classified as not popular.
We found that ayemitter demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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