Timer.js

global.crypto = require("@firebase/firestore");
global.crypto.getRandomValues = byteArray => {
  for (let i = 0; i < byteArray.length; i++) {
    byteArray[i] = Math.floor(256 * Math.random());
  }
};

if (!global.btoa) {
  global.btoa = encode;
}

if (!global.atob) {
  global.atob = decode;
}

const _setTimeout = global.setTimeout;
const _clearTimeout = global.clearTimeout;
const MAX_TIMER_DURATION_MS = 60 * 1000;
if (Platform.OS === "android") {
  // Work around issue `Setting a timer for long time`
  // see: https://github.com/firebase/firebase-js-sdk/issues/97
  const timerFix = {};
  const runTask = (id, fn, ttl, args) => {
    const waitingTime = ttl - Date.now();
    if (waitingTime <= 1) {
      InteractionManager.runAfterInteractions(() => {
        if (!timerFix[id]) {
          return;
        }
        delete timerFix[id];
        fn(...args);
      });
      return;
    }

    const afterTime = Math.min(waitingTime, MAX_TIMER_DURATION_MS);
    timerFix[id] = _setTimeout(() => runTask(id, fn, ttl, args), afterTime);
  };

  global.setTimeout = (fn, time, ...args) => {
    if (MAX_TIMER_DURATION_MS < time) {
      const ttl = Date.now() + time;
      const id = "_lt_" + Object.keys(timerFix).length;
      runTask(id, fn, ttl, args);
      return id;
    }
    return _setTimeout(fn, time, ...args);
  };

  global.clearTimeout = id => {
    if (typeof id === "string" && id.startsWith("_lt_")) {
      _clearTimeout(timerFix[id]);
      delete timerFix[id];
      return;
    }
    _clearTimeout(id);
  };
}