@react-navigation/core/lib/module/useScheduleUpdate.js

Core utilities for building navigators

import * as React from 'react';
const MISSING_CONTEXT_ERROR = "Couldn't find a schedule context.";
export const ScheduleUpdateContext = /*#__PURE__*/React.createContext({
  scheduleUpdate() {
    throw new Error(MISSING_CONTEXT_ERROR);
  },
  flushUpdates() {
    throw new Error(MISSING_CONTEXT_ERROR);
  }
});

/**
 * When screen config changes, we want to update the navigator in the same update phase.
 * However, navigation state is in the root component and React won't let us update it from a child.
 * This is a workaround for that, the scheduled update is stored in the ref without actually calling setState.
 * It lets all subsequent updates access the latest state so it stays correct.
 * Then we call setState during after the component updates.
 */
export default function useScheduleUpdate(callback) {
  const {
    scheduleUpdate,
    flushUpdates
  } = React.useContext(ScheduleUpdateContext);
  scheduleUpdate(callback);
  React.useEffect(flushUpdates);
}
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