@wordpress/data
Version:
Data module for WordPress.
42 lines • 930 B
JavaScript
/**
* Create an event emitter.
*
* @return The event emitter.
*/
export function createEmitter() {
let isPaused = false;
let isPending = false;
const listeners = new Set();
const notifyListeners = () =>
// We use Array.from to clone the listeners Set
// This ensures that we don't run a listener
// that was added as a response to another listener.
Array.from(listeners).forEach(listener => listener());
return {
get isPaused() {
return isPaused;
},
subscribe(listener) {
listeners.add(listener);
return () => listeners.delete(listener);
},
pause() {
isPaused = true;
},
resume() {
isPaused = false;
if (isPending) {
isPending = false;
notifyListeners();
}
},
emit() {
if (isPaused) {
isPending = true;
return;
}
notifyListeners();
}
};
}
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