Flow @flowtype

A typed dialect of JavaScript. flow.org Joined November 2014

Tweets

578
Followers

11K
Following

13
Likes

721

Flow @flowtype

3 months ago

The Rust port is just the start. Flow in 2026 isn't like you remember: flow.org

0 1 4 763 0

View Details

Flow @flowtype

3 months ago

Most of the Rust port was done by a single engineer over ~8 months, while the rest of the team kept shipping features: no code freeze. Read the full story: medium.com/flow-type/flow…

6 5 80 25K 29

View Details

Flow @flowtype

3 months ago

Flow is now written in Rust 🦀 The migration from OCaml to Rust brought up to 2x faster type-checking on large codebases.

29 67 619 249K 105

View Details

Flow @flowtype

3 months ago

@justboriss Yes, you can fix it by changing the code. If only there was a tool that would point out the problem in the first place - so you knew you had to make the fix 🤔

0 0 2 704 0

View Details

Flow @flowtype

3 months ago

Crashes at runtime - but TypeScript accepts it: zero errors under strict. Can you spot the bug?

17 5 98 30K 39

View Details

Flow @flowtype

3 months ago

@vpetryniak Doesn't seem like a good assumption 😬

0 0 2 780 0

View Details

@jaydenfyi Exactly, better to have your type-checker actually enforce you're doing the right thing and prevent your app from crashing! The actual Flow error message is longer and describes: - Either make `Array<string>` and `Array<LogLine>` the same - Or make array a `ReadonlyArray`

0 0 4 845 0

View Details

Flow @flowtype

3 months ago

Flow catches the crash before you ship it. More examples where Flow is safer: flow.org/en/docs/flow-v…

0 2 12 4K 4

View Details

Flow @flowtype

3 months ago

TypeScript lets you pass Array<string> where Array<string | Error> is expected, so the function pushes an Error to your string array. Flow rejects it. TS Playground, 0 errors: typescriptlang.org/play/?#code/C4… Flow Playground, rejects with an error: flow.org/try/#1N4Igxg9g…

3 0 18 5K 5

View Details

Seb ⚛️ ThisWeekInReact.com @sebastienlorber

3 months ago

👀 Is this Flow, or TypeScript? Is Flow coming back? - Flow syntax aligns with TypeScript - Flow has pattern matching - Useful React hooks/component/renders syntax - Compiler has been recently ported to Rust I'll keep an eye on it for you, but this is promising!

Flow @flowtype

3 months ago

JavaScript Pattern Matching with `match`, available now: medium.com/flow-type/java…

10 29 288 77K 82

8 5 137 22K 29

View Details

Flow @flowtype

3 months ago

JavaScript Pattern Matching with `match`, available now: medium.com/flow-type/java…

10 29 288 77K 82

View Details

Flow @flowtype

4 months ago

Flow for TypeScript Users in 2026: 20+ side-by-side comparisons, verified against TypeScript 6.0.3 with 'strict' enabled: flow.org/en/docs/flow-v…

2 3 13 1K 1

View Details

Flow @flowtype

4 months ago

Another: TypeScript only validates the signature of a type-guard, not the body. Flow validates the body and rejects predicates that lie about what they check.

2 1 11 1K 0

View Details

Flow @flowtype

4 months ago

If your "Flow vs TypeScript" take is from 2021, it's out of date. Flow looks like TypeScript now - but it has pattern matching and React component syntax, while catching runtime crashes TypeScript waves through. Examples below. 👇