Andrei Vasilev arekko

Monolithic Components, Composable Components

Introduction

Building reusable UI components is a non trivial task, as we need to anticipate a number of things when planing for reuseability. On the one end of the spectrum we want to enable customization and on the other side we want to avoid developers doing the wrong thing, like breaking the component or displaying invalid states.

To get a better understanding of what we need to think about and consider upfront, we will build a non-trivial UI component, that displays tags. Our Tags component will take care of managing and displaying tags.

The following examples are all built with Tachyons and React, but these ideas apply to any UI component and any general styling approach.

Making Unrepresentable UI Representations Unrepresentable!

When building components, we mostly start out with a minimal API, as we mostly have a clear initial idea of what the Component should do. But as requirements start to change, our API might start to evolve a long the way too. We start adding more props to cover conditional or special cases etc. Sometimes we use optional props, as in not required, or we might start using flags, as in boolean props or enums, to handle variants. Let's take a closer look at optional props and what effects these can have on our UI representation.

Optional props

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	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>();

	module.exports = {
	parser: "@typescript-eslint/parser", // Specifies the ESLint parser
	extends: [
	"plugin:@typescript-eslint/recommended" // Uses the recommended rules from the @typescript-eslint/eslint-plugin
	],
	parserOptions: {
	ecmaVersion: 2018, // Allows for the parsing of modern ECMAScript features
	sourceType: "module" // Allows for the use of imports
	},
	rules: {

	@UseMiddleware(hasRole("admin"))
	@Query(() => String)
	async hello() {
	return "Hello World!";
	}

	const util = require('util')
	const mysql = require('mysql')
	const pool = mysql.createPool({
	connectionLimit: 10,
	host: 'localhost',
	user: 'root',
	password: 'password',
	database: 'my_database'
	})

	//-----------------------------------------------//
	//On page load
	// - Browser -
	//-----------------------------------------------//

	AWS.config.update({
	region: "eu-west-1"
	});

	var credConfig = {