dgolosov

class AppError extends Error {
  constructor(message, data, options) {
    super(message, options);
    this.name = this.constructor.name;
    this.data = data;

    if (options && options.cause) {
      const stackOffset = (this.message.match(/\n/g) || []).length + 2;
      const afterCauseStack = this.stack
        .split("\n")

dgolosov

error_page 400 /400.json;
location /400.json {
  internal;
  default_type application/json;
  return 400 '{ "code": 400, "message":"Bad Request" }';
}

error_page 401 /401.json;
location /401.json {
  internal;

dgolosov

function animate(animation: AnimationFunction, ...args: unknown[]): Promise<void> {
  let start

  return new Promise<void>((resolve) => {
    function step(timestamp) {
      start ??= timestamp
      const isRunning = animation(timestamp - start, ...args)
      if (isRunning) {
        window.requestAnimationFrame(step)
      } else {

dgolosov

// The most perfomance way to populate a new array
[...Array(1000)].map((_, i) => i); // [0,...,999]

// Grouping array elements by condition
function groupBy(list, groupingCondition) {
  const groups = [];
  let currentGroup = [];

  for (const item of list) {
    if (currentGroup.length) {