Typescript Intellisense

[linonetwo]

Is it possible to add typing so it reflects it is a function parameter?

[haltcase]

You'll have to write a declaration file, something like this:

declare module 'param.macro' {
  export const _: any
  export const it: (...args: any[]) => any
  export const lift: (expr: any) => (...args: any[]) => any
}

I don't imagine this would be useful for type info but maybe for usability purposes it's ok.

[haltcase]

Feel free to discuss but I'm going to close since this is currently outside the scope of the project.

[ghalex]

Hi @citycide I still don't understand how should we use this with Typescript. I tried this:

const item = {id: 2}
const arr = [{id: 1}, {id: 2}]
const ndx = arr.findIndex(it.id === item.id);

gives me an error of:
Argument of type 'boolean' is not assignable to parameter of type ...

Do I miss something here ?

[haltcase]

@ghalex it's highly unlikely there's any typing you'll be able to do that will give you the full range of features, unfortunately. We'll need TypeScript compiler extensions most likely and there's nothing official for that right now.

The problem in your case is that findIndex is typed as expecting something like (el: T, i: number, arr: T[]) => boolean and you're simply passing an expression that evaluates to boolean (=== equality). There's currently no way of telling TypeScript that param.macro transforms that expression into the kind of function findIndex expects.

I'm happy to accept changes here that make TypeScript support possible but I don't think it'll be easy.

[LifeIsStrange]

@haltcase That's very unfortunate to hear, I hope the situation will improve eventually. The world is moving to typescript (BTW kotlin js now generate d.ts files !)
It seems that it is possible to create compiler plugins:
https://www.typescriptlang.org/tsconfig#plugins

[haltcase]

@LifeIsStrange I agree, I have also personally switched to TypeScript for many projects and miss param.macro every time 😄

I'm fairly certain a compiler plugin would be capable of this, but as far as I know this currently requires a separate wrapper around the compiler to enable their use in most cases, see ttypescript. I've considered doing this but have not explored the compiler API enough.

[linonetwo]

Wait...Are you talking about using param.macro in the TS project?

AFAIK macro works well in the TS, as long as you are using babel + ts , see https://github.com/linonetwo/template-based-generator-template/blob/master/src/data/index.ts for an example!