Abstract Class in .js with JSDoc has no effect?

[plain prism]

drwarpman#0

Playground Link

Preview:```ts
/**

• @abstract
  */
  export class Queue {
  constructor() {}
  }

const q = new Queue()```

You can choose specific lines to embed by selecting them before copying the link.

[reef skiff]

Why doesnt TypeScript read that its an abstract class and error me, or am i doing smth wrong?

[ebon stag]

@reef skiff These are the supported JSDoc tags: https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html @abstract is not among them.

[reef skiff]

Thanks.. thats sad though. so no abstract support?

[rose magnet]

https://github.com/microsoft/TypeScript/issues/17227

It looks like there mostly isn't considered enough demand for abstract classes in JS.

I think it's also just a bit more complex in JS - if I write

abstract class Base {
   abstract baseMethod(): string
}

that generates class Base {} in JS - the abstract method goes away completely.

It seems like it'd be a lot harder to have that sort of pattern in JS + JSDoc comments: you can't mark a non-existent method as abstract.

[reef skiff]

im confused

thats typescript?

oh right. i thought abstract classes in TS give no output

unless you have non-abstract stuff in it

interesting

but JS is not getting compiled, i would be satisfied with something as simple as an error message

but im still confused by your statement xD

[rose magnet]

My point is how do you write an "abstract class with an abstract method" in JS code?

[reef skiff]

u dont

well

[rose magnet]

Then how are you going to do it with JS + doc comments?

[reef skiff]

/**
 * @abstract
 */
class Queue {
    constructor() {
    }

    /**
     * @abstract
     */
    foobar() {

    }


}

😄

[rose magnet]

Yeah, but there's actually a foobar method there, unlike the generated TS.

[reef skiff]

Yea I get that, but thats fine, thats the same as typescript giving types but in the output there aint no types.

[rose magnet]

That seems minor but it seems like it would matter for interop reasons.

[reef skiff]

I just want it in my IDE, to make it error basically

[rose magnet]

It seems like JS+JSDoc abstract would actually work differently at runtime than TS abstract which might be annoying when consuming code and you don't know if it was written in JS or TS.

But I dunno, maybe it wouldn't actually matter. Either way, not something TS supports currently.