akovalev

// inspired by https://golang.org/pkg/context/

function noop() {
}

function makeBarrier() {
  let open;
  const whenOpened = new Promise((resolve, reject) => {
    open = resolve;
  });

akovalev

export {
  whenElementVisible
}

const threshold = [0, 0.25, 0.5, 0.75, 1];
const rootMargin = '40px';
const observer = new window.IntersectionObserver(observerCallback, { threshold, rootMargin });

const callbacks = window.callbacks = new WeakMap();

akovalev

import { EventEmitter } from "./event"

const print = console.log.bind(console)

const _indexedDB = (window.indexedDB
                 || window["mozIndexedDB"]
                 || window["webkitIndexedDB"]
                 || window["msIndexedDB"]) as IDBFactory

akovalev

function generateAllCombinations(listsOfArgs) {  
  return listsOfArgs.reduce((acc, list) => mix(acc, list), []);
}

function mix(listA, listB) {
  if (listA.length === 0) return listB;
  if (listB.length === 0) return listA;

  const result = [];