`satisfies` is my favorite TypeScript keyword (2024)

Post by ervine » Sat, Nov 22, 2025, 11:35 PM UTC

lloydatkinson wrote: post #7

epolanski wrote: post #3

> TypeScript is a wonderfully advanced language though it has an unfortunately steep learning curve An extremely steep one. The average multi-year TypeScript developer I meet can barely write a basic utility type, let alone has any general (non TypeScript related) notion of cardinality or sub typing. Hell, ask someone to write a signature for array flat, you'd be surprised how many would fail. Too many really stop at…

TypeScript codebases I've seen generally seem to have the widest demonstration of skill gap versus other languages I use. For example, I don't ever see anyone using `dynamic` or `object` in C#, but I will often see less skilled developers using `any` and `// @ts-ignore` in TypeScript at every possible opportunity even if it's making their development experience categorically worse. For these developers, the `type` ke…

Post by tomsmeding » Sat, Nov 22, 2025, 11:37 PM UTC

kaoD wrote: post #27

pcthrowaway wrote: post #22

Earlier quoted context omitted.

> Hell, ask someone to write a signature for array flat, you'd be surprised how many would fail. To be clear, an array flat type: type FlatArr = Arg extends [infer First, ...(infer Rest)] ? First extends unknown[] ? [...First, ...FlatArr ] : [First, ...FlatArr ] : []; is far from basic Typescript. The average Typescript dev likely doesn't need to understand recursive conditional types. It's a level of typescript one…

For those unfamiliar with TS, the above is just... function flat([head, ...tail]) { return Array.isArray(head) ? [...flat(head), ...flat(tail)] : [head, ...flat(tail)] } ...in TS syntax.

Post by miki123211 » Sat, Nov 22, 2025, 11:43 PM UTC

pcthrowaway wrote: post #22

epolanski wrote: post #3

> TypeScript is a wonderfully advanced language though it has an unfortunately steep learning curve An extremely steep one. The average multi-year TypeScript developer I meet can barely write a basic utility type, let alone has any general (non TypeScript related) notion of cardinality or sub typing. Hell, ask someone to write a signature for array flat, you'd be surprised how many would fail. Too many really stop at…

> Hell, ask someone to write a signature for array flat, you'd be surprised how many would fail. To be clear, an array flat type: type FlatArr = Arg extends [infer First, ...(infer Rest)] ? First extends unknown[] ? [...First, ...FlatArr ] : [First, ...FlatArr ] : []; is far from basic Typescript. The average Typescript dev likely doesn't need to understand recursive conditional types. It's a level of typescript one…

Post by probabletrain » Sat, Nov 22, 2025, 11:53 PM UTC

wk_end wrote: post #24

pcthrowaway wrote: post #22

Earlier quoted context omitted.

> Hell, ask someone to write a signature for array flat, you'd be surprised how many would fail. To be clear, an array flat type: type FlatArr = Arg extends [infer First, ...(infer Rest)] ? First extends unknown[] ? [...First, ...FlatArr ] : [First, ...FlatArr ] : []; is far from basic Typescript. The average Typescript dev likely doesn't need to understand recursive conditional types. It's a level of typescript one…

If I saw that in a PR I would push very hard to reject; something like that is a maintenance burden that probably isn’t worth the cost, and I’ve been the most hardcore about types and TypeScript of anyone of any team I’ve been on in the past decade or so. Now, that said, I probably would want to be friends with that dev. Unless they had an AI generate it, in which case the sin is doubled.

Post by spankalee » Sun, Nov 23, 2025, 12:02 AM UTC

wk_end wrote: post #24

pcthrowaway wrote: post #22

Earlier quoted context omitted.

> Hell, ask someone to write a signature for array flat, you'd be surprised how many would fail. To be clear, an array flat type: type FlatArr = Arg extends [infer First, ...(infer Rest)] ? First extends unknown[] ? [...First, ...FlatArr ] : [First, ...FlatArr ] : []; is far from basic Typescript. The average Typescript dev likely doesn't need to understand recursive conditional types. It's a level of typescript one…

If I saw that in a PR I would push very hard to reject; something like that is a maintenance burden that probably isn’t worth the cost, and I’ve been the most hardcore about types and TypeScript of anyone of any team I’ve been on in the past decade or so. Now, that said, I probably would want to be friends with that dev. Unless they had an AI generate it, in which case the sin is doubled.