@react-native-firebase/app/dist/module/internal/web/memidb/lib/scheduling.js

A well tested, feature rich Firebase implementation for React Native, supporting iOS & Android. Individual module support for Admob, Analytics, Auth, Crash Reporting, Cloud Firestore, Database, Dynamic Links, Functions, Messaging (FCM), Remote Config, Sto

"use strict";

// When running within Node.js (including jsdom), we want to use setImmediate
// (which runs immediately) rather than setTimeout (which enforces a minimum
// delay of 1ms, and on Windows only has a resolution of 15ms or so).  jsdom
// doesn't provide setImmediate (to better match the browser environment) and
// sandboxes scripts, but its sandbox is by necessity imperfect, so we can break
// out of it:
//
// - https://github.com/jsdom/jsdom#executing-scripts
// - https://github.com/jsdom/jsdom/issues/2729
// - https://github.com/scala-js/scala-js-macrotask-executor/pull/17
function getSetImmediateFromJsdom() {
  if (typeof navigator !== 'undefined' && /jsdom/.test(navigator.userAgent)) {
    const outerRealmFunctionConstructor = Node.constructor;
    return new outerRealmFunctionConstructor('return setImmediate')();
  } else {
    return undefined;
  }
}

// Schedules a task to run later.  Use Node.js's setImmediate if available and
// setTimeout otherwise.  Note that options like process.nextTick or
// queueMicrotask will likely not work: IndexedDB semantics require that
// transactions are marked as not active when the event loop runs. The next
// tick queue and microtask queue run within the current event loop macrotask,
// so they'd process database operations too quickly.
export const queueTask = fn => {
  const setImmediate = globalThis.setImmediate || getSetImmediateFromJsdom() || (fn => setTimeout(fn, 0));
  setImmediate(fn);
};
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