just-boris

const { join } = require("path");
const {
  buildThemedComponents,
} = require("@cloudscape-design/components-themeable/theming");

/** @type import('@cloudscape-design/components-themeable/theming').Theme */
const theme = {
  tokens: {
    fontFamilyBase: "'Helvetica Neue', Roboto, Arial, sans-serif",
  },

just-boris

import { createStateLifter } from './state-lifter'

const { Provider, useLiftedState } = createStateLifter("all");

export const LiftedCounter = () => (
  <Provider>
    <Filter />
    <List />
  </Provider>
);

just-boris

import React, { useEffect, useRef } from 'react';

// Credits to
// https://github.com/theKashey/focus-lock/blob/33f8b4bd9675d2605b15e2e4015b77fe35fbd6d0/src/utils/tabbables.ts
const tabbables = [
  'button:enabled',
  'select:enabled',
  'textarea:enabled',
  'input:enabled',

just-boris

function sliceItems(items, limit) {
  if (items.length <= limit + 1) {
    return { visible: items, hidden: [] };
  }
  return {
    visible: items.slice(0, limit),
    hidden: items.slice(limit)
  };
}

just-boris

Web Components trade-offs

Desired state

Before we begin talking about the trade-offs, let's look at the desired state, why someone should use Web Components and what benefits it provides. This standard allows you to create framework-independent UI components. Instead of re-inventing the same concept of UI component for every framework, there could be a universal solution using Web Components standard. They will also be more simple and lightweight, as the API is already built into browsers and you do not need to load additional runtime to your web page.

Web Components are defined as custom HTML elements where you can attach your custom behavior. You do not need to learn additional proprietary framework conventions, as you can think about using Web Component same way as you would use <button> or <input>.

Now let's check how these expectations match with the real state.

just-boris

import { useCallback, useEffect, useRef } from 'react';

/**
 * A callback that stays stable between renders even as the dependencies change.
 *
 * @see https://reactjs.org/docs/hooks-faq.html#how-to-read-an-often-changing-value-from-usecallback
 */
export function useStableEventHandler<T extends (...args: any[]) => any>(fn: T): T {
  const ref = useRef<T>();

just-boris

import { NestedWeakMap } from './nested-weak-map';

const key1 = {};
const key2 = {};
const map = new NestedWeakMap();

map.get([key1, key2]); // undefined
map.getOrCreate([key1, key2], () => 'default'); // "default"
map.get([key1, key2]); // "default"

just-boris

import path from 'path';

function shouldApply(url) {
  return path.extname(url) === '.css';
}

export function getFormat(url, context, defaultGetFormat) {
  if (shouldApply(url)) {
    return {
      format: 'module',

just-boris

export const DEBOUNCE_DEFAULT_DELAY = 200;

export default function debounce(func, delay = DEBOUNCE_DEFAULT_DELAY) {
  let timeout;

  return function(...args) {
    if (timeout) {
      clearTimeout(timeout);
    }
    timeout = setTimeout(() => {

just-boris

File size checker

Prevents you from accidentially commenting very big assets. Make sure that you have optimized all your assets.

Installation

1. Add the script to your repo
2. Configure lint-staged