react-sweet-state/lib/esm/utils/schedule.js

Global + local state combining the best of Redux and Context API

import defaults from '../defaults';
import { batch } from './batched-updates';
import supports from './supported-features';
const QUEUE = [];
let scheduled;
export default function schedule(fn) {
  // if we are in node/tests or feature disabled, make updates sync batched
  if (!defaults.batchUpdates || !supports.scheduling()) return batch(() => fn()); // Add to queue if not already there
  // so we avoid multiple notifications to same store listeners

  if (!QUEUE.includes(fn)) QUEUE.push(fn); // if something already started schedule, skip

  if (scheduled) return;
  scheduled = batch(() => {
    let queueFn;

    while (queueFn = QUEUE.shift()) queueFn();

    scheduled = null;
  });
}