I just found out that there is a wrapper for TypeS...

# javascript

[Ayfri]

I just found out that there is a wrapper for TypeScript that is out on kotlin-wrapperes, if anyone needs it !
https://github.com/JetBrains/kotlin-wrappers/tree/master/kotlin-typescript

[andylamax]

I am not sure how I would use this wrapper, can someone give me a use case please?

[Big Chungus]

To get "global" Record<T> type for example. This then can be used in your public API that you plan to export to your TS consumers.

[Grégory Lureau]

So I could basically write a facade to transform a Kotlin Map to a Typescript Record ? ... that looks awesome 🤩

[Big Chungus]

You could do all that without it by just declaring Record external yourself. This is just a convenience and standartization library (for other libs to potential link their public API against)

[Grégory Lureau]

Thank you, at least I don't have to redefine them in all projects.

[turansky]

My use cases:
1. Splitter/SPA - unlock webpack optimization and generate many ES6 modules from single JS file, generated by Kotlin/JS
1 kt -> n js
1. Converter - from TS to Kotlin
cc @Sergei Grishchenko

[Big Chungus]

I suspect this might be a stepping stone to finally stabilising dukat, as currently it's generating all the DOM and TS declarations for each dependency instead of linking them to some central library (DOM is already in js stdlib, TS is now under a single umbrella as well)

[turansky]

Common Record located in kotlin-extensions

[Sergei Grishchenko]

To get "global" Record<T> type for example. T

Please, don't use such generic types from kotlin-typescript , it is internal declarations for typescript compiler, these types are needed for infrastructure tasks (static code analysis, code transformations, etc.)
For kotlin js stdlib polifiling kotlin-extensions module should be used.

[Big Chungus]

Why not? Since those externals are in global scope, produced .d.ts files from kotlin lib using them will not contain any imports and will assume global Record existence which ts compiler expects. Am I missing something obvious?

[Big Chungus]

Remember that TS doesn't really have a stdlib, just standard global types. So I'd be surprised if this new kotlin wrappers lib has any js module imports or business logic.

[turansky]

kotlin-typescript - TypeScript compiler declarations (for Node.js only)

[turansky]

Record from kotlin-extensions will be used in future

[Big Chungus]

Anyone got a link to those magical kotlin-extensions? Googling just surfaces extension function docs...

[Big Chungus]

Otherwise I see where I was wrong. Typescript compiler is the key word here. i.e. it has nothing to do with ts utility types like Record.

I'm not at a loss trying to come up with a use case for having such kotlin wrappers.

[turansky]

kotlin-extensions

[Ayfri]

But the type of Record in kotlin-extensions isn't right, as an object in JS can have nullable keys & values

[turansky]

Key in nonnulable

[Big Chungus]

Also Record there is not even external. WTF?

[turansky]

Like Array ? 🙂

[Ayfri]

Ah okay, I just tested into a JS console , sorry ^^'

[Sergei Grishchenko]

Am I missing something obvious?

@Big Chungus it seems you mix up internal ts declarations https://github.com/microsoft/TypeScript/blob/main/lib/typescript.d.ts and external (there is external declaration for each release of ECMAScript e. g. https://github.com/microsoft/TypeScript/blob/main/lib/lib.es2015.d.ts)
Yea, you are right, there is no stdlib in typescript but typescript has declaration for all browser environment that specified in ECMAScript and you can cofigure what environment your code is executed in, see lib tsconfig option https://www.typescriptlang.org/tsconfig#lib
Kotlin has similar staff but unfortunately Kotlin definitions are outdated often, and you cannot configure your environment, that is why we have kotlin-extentions in wrappers

[Sergei Grishchenko]

All utility types as Record or Omit also are declared here https://github.com/microsoft/TypeScript/blob/08221166d9c383ee6c6cc82ad1869a9847f7051e/src/lib/es5.d.ts