I want to define class with generic parameter T and some methods operating with instances of the same class with the same parameter T.
But it doesn’t produce type errors as I expect.

I want to define class with generic parameter T and some methods operating with instances of the same class with the same parameter T.
But it doesn’t produce type errors as I expect.

I’m using typescript 5.4.5, and I have the following utility helpers:

I want to be able to infer different types based on whether the value of a parameter is null or not. Here is what I have:

Im trying(and failing) to build table generator based on row and column arrays.

I’m trying to get a union type made out of keys that are nested within the ‘indexes’ like in the code below.

type Wrapper<P extends string> = { [P]: string; }; type Wrapped = Wrapper<‘key’>; // valid const wrapped: Wrapped = { key: ‘string’ }; // invalid const wrapped: Wrapped = { k: ‘string’ }; Here we have wrapper with type param P that I want to use to specify a specific key. But it doesn’t looks […]

I have a code:

I’m trying to understand this error, but I can’t seem to make sense of it… I’m using some Typescript features that are fairly new to me (conditional types), so I could just be misunderstanding how they work.

In Konva we have a class like this: