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https://www.typescriptlang.org/docs/handbook/advanced-types.html#type-inference-in-conditional-types

Type inference in conditional types Within the extends clause of a conditional type, it is now possible to have infer declarations that introduce a type variable to be inferred. Such inferred type variables may be referenced in the true branch of the conditional type. It is possible to have multiple infer locations for the same type variable.

For example, the following extracts the return type of a function type:

type ReturnType<T> = T extends (...args: any[]) => infer R ? R : any;

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{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Example",
      "type": "node",
      "request": "launch",
      "runtimeExecutable": "node",
      "runtimeArgs": ["--nolazy", "-r", "ts-node/register/transpile-only"],

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var u = 2000

function cancableDelay(delay, callback, before) {
  return () => {
    let timer;
    const promise = new Promise((rs, rj) => {
      let ret = true
      if (typeof before === 'function') {
        ret = before(rs, rj) !== false;
      }

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/**
* supplant() does variable substitution on the string. It scans through the string looking for 
* expressions enclosed in { } braces. If an expression is found, use it as a key on the object, 
* and if the key has a string value or number value, it is substituted for the bracket expression 
* and it repeats.
*
* Written by Douglas Crockford
* http://www.crockford.com/
*/
String.prototype.supplant = function (o) {

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A non-exhaustive list of WebGL and WebGPU frameworks and libraries. It is mostly for learning purposes as some of the libraries listed are wip/outdated/not maintained anymore.

Engines and libraries

• three.js: JavaScript 3D library
• stack.gl: an open software ecosystem for WebGL, built on top of browserify and npm.
• PixiJS: Super fast HTML 5 2D rendering engine that uses webGL with canvas fallback
• Pex: Pex is a javascript 3d library / engine allowing for seamless development between Plask and WebGL in the browser.
• Babylon.js: a complete JavaScript framework for building 3D games with HTML 5 and WebGL
• Filament: Filament is a real-time physically based rendering engine for Android, iOS, Windows, Linux, macOS and WASM/WebGL
• ClayGL: A WebGL graphic library

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#!/usr/bin/env swift
// REPL for JavaScriptCore (for arrow keys, use rlwrap command)
import JavaScriptCore

class Timeout: NSObject, JSExport {
    let item: DispatchWorkItem
    init(_ item: DispatchWorkItem) {self.item = item}
}

func installBuiltins(_ ctx: JSContext) {

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function delay(msec, value) {
  return new Promise(done => window.setTimeout((() => done(value)), msec));
}

function isResolved(promise) {
  return Promise.race([delay(0, false), promise.then(() => true, () => false)]);
}

function isRejected(promise) {
  return Promise.race([delay(0, false), promise.then(() => false, () => true)]);

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// https://stackoverflow.com/questions/53807517/how-to-test-if-two-types-are-exactly-the-same
// https://github.com/Microsoft/TypeScript/issues/27024
// https://github.com/microsoft/TypeScript/issues/37314#issuecomment-598459316
/*
type Equals<X,Y> =
    (<T>() => T extends X ? true : false) extends
    (<T>() => T extends Y ? true : false) ? true : false;
*/

type Equal<T, S> = [T] extends [S] ? ([S] extends [T] ? true : false) : false

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//---------------------------------------------------------------------
//
// QR Code Generator for JavaScript
//
// Copyright (c) 2009 Kazuhiko Arase
//
// URL: http://www.d-project.com/
//
// Licensed under the MIT license:

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//---------------------------------------------------------------------
//
// QR Code Generator for JavaScript
//
// Copyright (c) 2009 Kazuhiko Arase
//
// URL: http://www.d-project.com/
//
// Licensed under the MIT license: