Matt Pocock

TypeScript enums are not great. In almost all cases, I use an 'as const' with a sprinkling of type magic to express them.

Become a TypeScript Wizard with Matt's TypeScript Course:

https://www.totaltypescript.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk

Enums considered harmful

SWR 2.0 just got released - let's take a look at all the shiny new goodness!

SWR: https://swr.vercel.app/
TanStack Query: https://tanstack.com/query/v4

Become a TypeScript Wizard with Matt's upcoming TypeScript Course:

https://www.totaltypescript.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk

Vercel wants you to fetch data like this

Become a TypeScript Wizard with Matt's upcoming TypeScript Course:

https://www.mattpocock.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk

Building LOOSE AUTOCOMPLETE with TypeScript - Advanced TypeScript

The ultimate TypeScript tutorial is the TypeScript docs. In this video, I take you on a crash course of the TypeScript handbook, focusing on the beginners section.

To continue your journey, take Matt's beginner's course. It's free, interactive, and fast-paced.

https://www.totaltypescript.com/tutorials/beginners-typescript

Follow me on Twitter: https://twitter.com/mattpocockuk
TypeScript Error Translator: http://mattpocock.com/vscode

00:00 Intro
00:37 TypeScript for JavaScript Programmers
03:16 TypeScript Handbook
03:26 Runtime errors
03:44 Error Messages
05:26 3rd-party libraries
06:08 Installing TypeScript
06:27 Running tsc
07:23 TypeScript on CI
08:11 Strictness
09:39 Should you be strict?
10:35 string, number, boolean
10:56 Arrays
11:50 Arrays vs Tuples
12:16 any
13:41 Typing variables
14:11 Typing functions
15:02 Object types
16:05 Optional object properties
16:45 Union types
18:05 Type and Interface
18:59 Type assertions
20:06 as any
20:42 Literal types
22:26 null and undefined
22:56 Outro

TypeScript Speedrun: Crash Course for Beginners

Zod is an extraordinary library for TypeScript validation, and with 3.20 it just got even better.

Matt's Zod Course: https://totaltypescript.com/tutorials/zod
GitHub Release: https://github.com/colinhacks/zod/releases/tag/v3.20

Become a TypeScript Wizard with Matt's upcoming TypeScript Course:

https://www.totaltypescript.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk

The best TypeScript library just got better

XState core member Matt Pocock speedruns the XState docs to teach you everything you need to know to get started with XState.

Chapters:
0:00 Introduction
1:00 Getting started
1:35 States & Transitions
3:42 Initial states
4:00 Final states
5:26 Compound states
7:34 Parallel states
9:46 Self transitions
11:00 Actions
14:20 Entry & Exit actions
16:17 Machine ids
16:42 Machine options
17:59 .withConfig
18:35 machine.transition
20:45 state.matches
21:34 state.nextEvents
22:38 state.can
23:41 Other state properties
27:17 Context & assign
32:29 Always transitions & Guards
36:03 Infinite always error - explanation and fix
39:30 If/else transitions
42:36 interpret
44:47 Transitions in FSM's
45:30 Wildcard events
48:10 Multiple targets
49:06 Parent/child inheritance of transitions
51:35 Effects
51:54 Invoking promise-based services
55:38 Services type safety
58:40 Invoked callbacks
1:00:20 Cancelling promise-based services
1:01:32 After transitions
1:04:05 Stuff we won't cover
1:05:06 TypeScript & Event values
1:08:35 Finish

XState Docs Speedrun - 2022

const modifiers for type parameters are coming to TypeScript 5.0! The PR's not even merged yet - but you can already start playing with it.

Andarist's tweet: https://twitter.com/AndaristRake/status/1602701606721814528
The PR: https://github.com/microsoft/TypeScript/pull/51865

Become a TypeScript Wizard with Matt's TypeScript Course: https://www.totaltypescript.com/

Follow Matt on Twitter: https://twitter.com/mattpocockuk

const modifiers make generics a LOT easier

Become a TypeScript Wizard with Matt's upcoming TypeScript Course:

https://www.totaltypescript.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk