Matt Pocock

Learning about the difference between optional properties (name?: string) and undefined unions (name: string | undefined) can give you an amazing productivity boost for certain refactors.

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

https://www.totaltypescript.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk

The tip that saved me HOURS of refactoring time - Advanced TypeScript

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

https://www.totaltypescript.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk

WHEN should I use a Generic? - Advanced TypeScript

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

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

https://www.totaltypescript.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk

Do the challenge!

https://github.com/type-challenges/type-challenges/blob/main/questions/00004-easy-pick/README.md

KEYOF and EXTENDS right off the bat?! - Type Challenges #1

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

Dynamic function arguments with GENERICS - Advanced TypeScript

Turn MODULES INTO TYPES with typeof import - Advanced TypeScript

Learn how let, const and 'as const'  changes the way that TS infers your code.

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

https://www.totaltypescript.com/

Follow Matt on Twitter

https://twitter.com/mattpocockuk