@applicaster/zapp-react-native-utils/time/BackgroundTimer.ts

Applicaster Zapp React Native utilities package

import { DeviceEventEmitter, NativeModules } from "react-native";
import { platformSelect } from "../reactUtils";

const { BackgroundTimer: RNBackgroundTimer } = NativeModules;

class BackgroundTimer {
  private uniqueId: number;
  private readonly callbacks: Record<number, () => void>;

  constructor() {
    this.uniqueId = 0;
    this.callbacks = {};

    const EventEmitter = platformSelect({
      android: DeviceEventEmitter,
      android_tv: DeviceEventEmitter,
      amazon: DeviceEventEmitter, // probably does not exist and uses android_tv
      default: undefined,
    });

    EventEmitter?.addListener("BackgroundTimer.timer.fired", (id: number) => {
      const callback = this.callbacks[id];

      if (callback) {
        delete this.callbacks[id];
        callback();
      }
    });
  }

  setTimeout(callback, timeout): number | NodeJS.Timeout {
    if (!RNBackgroundTimer) {
      return global.setTimeout(callback, timeout);
    }

    this.uniqueId += 1;
    const timeoutId = this.uniqueId;

    this.callbacks[timeoutId] = callback;
    RNBackgroundTimer.setTimeout(timeoutId, timeout);

    return timeoutId;
  }

  clearTimeout(timeoutId: number | NodeJS.Timeout): void {
    if (!RNBackgroundTimer) {
      return global.clearTimeout(timeoutId as NodeJS.Timeout);
    }

    if (this.callbacks[timeoutId as number]) {
      delete this.callbacks[timeoutId as number];
      RNBackgroundTimer.clearTimeout(timeoutId);
    }
  }
}

export default new BackgroundTimer();