react-sweet-state/lib/esm/utils/batched-updates.js

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

/* eslint-disable import/no-unresolved */
import { unstable_batchedUpdates } from 'react-dom';
import { unstable_scheduleCallback as scheduleCallback, unstable_ImmediatePriority as ImmediatePriority } from 'scheduler';
import defaults from '../defaults';
import supports from './supported-features';
let isInsideBatchedSchedule = false;
export function batch(fn) {
  // if we are in node/tests or nested schedule
  if (!defaults.batchUpdates || !supports.scheduling() || isInsideBatchedSchedule) {
    return unstable_batchedUpdates(fn);
  }

  isInsideBatchedSchedule = true; // Use ImmediatePriority as it has -1ms timeout
  // https://github.com/facebook/react/blob/main/packages/scheduler/src/forks/Scheduler.js#L65

  return scheduleCallback(ImmediatePriority, function scheduleBatchedUpdates() {
    unstable_batchedUpdates(fn);
    isInsideBatchedSchedule = false;
  });
}