leihuang23

function traverse(node, processTask, continuation) {
  processTask(node, function handleChildren() {
    const children = node.childNodes;

    function handleOne(i, len, continuation) {
      if (i < len) {
        traverse(children[i], processTask, function handleNext() {
          handleOne(i + 1, len, continuation);
        });
      } else {

leihuang23

let timeout = null;
const queue = new Set();
function process() {
  for (const task of queue) {
    task();
  }
  queue.clear();
  timeout = null;
}

leihuang23

// This code is mostly useless. I put it here for
// the purpose of entertainment...
function detectIfUserIsFromChina() {
  const img = new Image()
  img.setAttribute("src", `https://www.google.com/favicon.ico?t=${Date.now()}`)
  img.setAttribute("style", "width:0;height:0;visibility:hidden;")
  document.body.appendChild(img)
  
  return new Promise(res => {
      img.onerror = () => res(true)

leihuang23

/**
 * @param asyncFn - A promise-returning function. e.g. an HTTP call.
 * @param expiresIn - The number of milliseconds for the result from calling `asyncFn` to expire.
 * @returns A memoized function that will always resolve to the first result of calling `asyncFn`,
 * as long as the result has not expired.
 */
export function memoPromise(asyncFn, expiresIn) {
    const emptyId = Symbol("empty")
    const memo = {}

leihuang23

export default function isCyclic(object, seen = new WeakSet().add(object)) {
    const props = getProps(object)
    let len = props.length

    while (len--) {
        const value = object[props[len]]
        if (value instanceof Object) {
            if (seen.has(value)) {
                return true
            }