@nozbe/watermelondb/react/withObservables/garbageCollector.js

Build powerful React Native and React web apps that scale from hundreds to tens of thousands of records and remain fast

"use strict";

exports.__esModule = true;
exports.default = scheduleForCleanup;
var cleanUpBatchingInterval = 250; // ms
var cleanUpInterval = 2000; // ms

var pendingCleanupActions = [];
var scheduledCleanUpScheduler = null;
function cleanUpWithObservablesActions(actions) {
  actions.forEach(function (action) {
    return action();
  });
}
function scheduleCleanUp() {
  scheduledCleanUpScheduler = null;
  var actions = pendingCleanupActions.slice(0);
  pendingCleanupActions = [];
  setTimeout(function () {
    cleanUpWithObservablesActions(actions);
  }, cleanUpInterval);
}

// Apparently, setTimeout/clearTimeout functions are very expensive (22 microseconds/call)
// But we must schedule a cleanup / garbage collection action
// (https://github.com/facebook/react/issues/15317#issuecomment-491269433)
// The workaround is this: all cleanup actions scheduled within a 250ms window will be scheduled
// together (for 2500ms later).
// This way, all actions within that window will only call setTimeout twice
function scheduleForCleanup(fn) {
  pendingCleanupActions.push(fn);
  if (!scheduledCleanUpScheduler) {
    scheduledCleanUpScheduler = setTimeout(scheduleCleanUp, cleanUpBatchingInterval);
  }
}