Is there API to get type of a context?

[zhaoyao91]

say, we have a context Context<MyValue>, how to extract type MyValue?

[amoutonbrady]

I may have one or two examples to point to, but could you first provide a more complete example of what you are trying to achieve and can't do?

[zhaoyao91]

I am making a library which export a predefined context to users. Currently I have to define another XXContenxtValue and export it with the context, but if there is standard way to extract the value type of the context, thing could be cleaner.

[danielpza]

Perhaps this is what you want https://www.typescriptlang.org/docs/handbook/2/conditional-types.html#inferring-within-conditional-types

type ContextType<T extends Context<any>> = T extends Context<infer R> ? R : never;

type MyContext = Context<number>

const value: ContextType<MyContext> // number

[zhaoyao91]

Thanks for this clever method. (p.s. solid even not export Context type)

[ryansolid]

I thought I had addressed most of these in: f870851. But it looks like I still missed Context. Let me know if you come across any others.