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Matt Pocock Profile picture
@mattpocockuk
Apr 1, 2022 • 30 tweets • 7 min read • Read on X
🧵 The Ultimate TypeScript Thread 🧵

Here's everything I've learned from leading TS dev teams and working on XState's core team.

My goal is to turn you into a TypeScript wizard.

And yes, this thread is EVERGREEN - I'll add at least 3 more tips a week 🚀

Let's get started.

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More from @mattpocockuk

Matt Pocock Profile picture
Mar 7
MCP has ALREADY become an overloaded term.

Let's break it down into clients, servers and protocols: Image
MCP is built out of three ideas.

You have a client, a server, and a protocol to connect them together. Let's define each of them in turn.
The server is the thing that chats to the API's.

It can be on a remote server (i.e. in the cloud), or on your local system.

It contains all the code needed to actually take actions on the systems it talks to - sending Slack messages, creating files etc. Image
Read 7 tweets
Matt Pocock Profile picture
Mar 6
Lots of folks feeling FOMO about MCP.

Here's the problem it solves: Image
Image
If you want to get your LLM to do useful things in the world, you will quickly hit a problem.

All the useful things in the world, like Slack, GitHub, or even your local filesystem, provide their own unique API to access them.
So, you end up writing a ton of code to glue your LLM and those API's together.

Want to add a new tool? That's more glue code. Grim.
Read 6 tweets
Matt Pocock Profile picture
Oct 1, 2024
z.strict() fixed a nasty bug for me this morning.

You should probably be using it on most of the schemas that handle outside data.

Here's the bug 🧵 Image
I had a form where I was marking the date a post was posted. I was expecting a key of `postedAt`, with an optional datetime. Image
Except, in my form, I had gotten the `name` field wrong: Image
Read 7 tweets
Matt Pocock Profile picture
Aug 20, 2024
Narrowing down the types of values is key knowledge for any TypeScript dev.

Here's 11 different ways you can do it. I bet you won't know 2 or 3 of them!

🧵
Narrowing with typeof: Image
Narrowing with truthiness: Image
Read 13 tweets
Matt Pocock Profile picture
Aug 8, 2024
So many folks don't know about structuredClone.

It's awesome, built-in, and supported in all major browsers.

Let's learn 🧵 Image
A common pattern in JavaScript is to create an immutable clone of an object. This is useful when you want to make mutations to it without changing the original.

For that, you'll often see code using the spread operator: `{ ...obj }`. Image
However, this only creates a shallow clone. This means that if the object has nested objects, they will be shared between the original and the clone.

Here, `deep` is shared between `originalObj` and `newObj`, not cloned across. Image
Read 10 tweets
Matt Pocock Profile picture
Aug 7, 2024
I'm starting to think that library types in TypeScript are all wrong.

Instead of top-level types, they should be available right on the functions that use them.

Brief thread 🧵 Image
How is this possible? Well, it's due to a trick in the way namespaces work in TypeScript.

When you export a namespace with the same name as a function, TypeScript combines the two: Image
This still works with 'import type', too: Image
Read 4 tweets

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