@quidone/react-native-wheel-picker/src/utils/nanoevents/nanoevents.js

Picker is a UI component for selecting an item from a list of options.

export let createNanoEvents = () => ({
  emit(event, ...args) {
    for (
      let callbacks = this.events[event] || [],
        i = 0,
        length = callbacks.length;
      i < length;
      i++
    ) {
      callbacks[i](...args);
    }
  },
  events: {},
  on(event, cb) {
    (this.events[event] ||= []).push(cb);
    return () => {
      this.events[event] = this.events[event]?.filter((i) => cb !== i);
    };
  },
});