DavidWells

// via https://stackoverflow.com/questions/46005706/get-the-path-to-the-accessed-value-in-a-nested-object
function wrap(o, fn, scope = []) {
  const handler = {
    set(target, prop, value, receiver) {
      fn('set value in scope: ', scope.concat(prop))
      target[prop] = value
      return true
    },
    get(target, prop, receiver) {
      fn('get value in scope: ', scope.concat(prop))

DavidWells

/* Using a JavaScript proxy for a super low code REST client */
// via https://dev.to/dipsaus9/javascript-lets-create-aproxy-19hg
// also see https://towardsdatascience.com/why-to-use-javascript-proxy-5cdc69d943e3
// also see https://github.com/fastify/manifetch
// also see https://github.com/flash-oss/allserver
// and https://gist.github.com/v1vendi/75d5e5dad7a2d1ef3fcb48234e4528cb

const createApi = (url) => {
  return new Proxy({}, {
    get(target, key) {

DavidWells

const { URL } = require('url')
const assert = require('assert')

const DEFAULT_BASE = 'https://api.github.com'

/* Zero dependency backward compatible url parser */
function parseUrl(url) {
  const match = url.match(/^(https?)?(?:[\:\/]*)([a-z0-9\.-]*)(?:\:(\d+))?(\/[^?#]*)?(?:\?([^#]*))?(?:#(.*))?$/i)
  return {
    protocol: match[1] || '',

DavidWells

const process = require('process')
const styles = require('ansi-styles')

// via https://github.com/sindresorhus/is-unicode-supported/blob/main/index.js
function isUnicodeSupported() {
  if (process.platform !== 'win32') return process.env.TERM !== 'linux'; // Linux console (kernel)
  return Boolean(process.env.CI)
    || Boolean(process.env.WT_SESSION) // Windows Terminal
    || process.env.ConEmuTask === '{cmd::Cmder}' // ConEmu and cmder
    || process.env.TERM_PROGRAM === 'vscode' || process.env.TERM === 'xterm-256color' || process.env.TERM === 'alacritty';

DavidWells

// via https://github.com/nalgeon/sqlime/blob/3.37.2/js/gister.js
// https://twitter.com/simonw/status/1482845419637903366
// Github Gist API client

const HEADERS = {
    Accept: "application/json",
    "Content-Type": "application/json",
};

class Gister {

DavidWells

const cronstrue = require('cronstrue')
// https://github.com/harrisiirak/cron-parser

const MONTHS = [null, 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
const DAYS = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
const dayNum = {
  sun: '0',
  mon: '1',
  tue: '2',
  wed: '3',

DavidWells

// https://github.com/shm-open/utilities/blob/master/src/url.ts?cool#L52
function parseURL(url, base) {
    let rest = url;
    const reProtocol = /^([a-z][a-z0-9.+-]*:)?(\/\/)?([\S\s]*)/i;
    // extract protocol
    const protocolMatch = reProtocol.exec(url);
    let protocol = protocolMatch[1]?.toLowerCase() ?? '';
    const hasSlashes = !!protocolMatch[2];
    // eslint-disable-next-line prefer-destructuring
    rest = protocolMatch[3];

DavidWells

How Does It Work?

How Partytown's Sync Communication Works

Partytown relies on Web Workers, Service Workers, JavaScript Proxies, and a communication layer between them all.

1. Scripts are disabled from running on the main thread by using the type="text/partytown" attribute on the <script/> tag.
2. Service worker creates an onfetch handler to intercept specific requests.
3. Web worker is given the scripts to execute within the worker thread.
4. Web worker creates JavaScript Proxies to replicate and forward calls to the main thread APIs (such as DOM operations).

DavidWells

// https://github.com/satya164/warn-once/blob/main/index.js   
const DEV = process.env.NODE_ENV !== "production";

const warnings = new Set();

function warnOnce(condition, ...rest) {
  if (DEV && condition) {
    const key = rest.join(" ");

    if (warnings.has(key)) {

DavidWells

// https://github.com/apify/apify-shared-js/blob/master/packages/utilities/src/utilities.ts#L188
/**
 * List of forbidden usernames. Note that usernames can be used as apify.com/username,
 * so we need to prohibit any username that might be part of our website or confusing in anyway.
 */
const FORBIDDEN_USERNAMES_REGEXPS = [
    // Meteor app routes
    'page-not-found', 'docs', 'terms-of-use', 'about', 'pricing', 'privacy-policy', 'customers',
    'request-form', 'request-solution', 'release-notes', 'jobs', 'api-reference', 'video-tutorials',
    'acts', 'key-value-stores', 'schedules', 'account', 'sign-up', 'sign-in-discourse', 'admin',