How do you guys use Kotlin/JS libraries in other JS applications? Does anyone have any experience wi...

# javascript

[Evan R.]

How do you guys use Kotlin/JS libraries in other JS applications? Does anyone have any experience with that?

[Evan R.]

@turansky do you have any pointers or sample code I could refer to? I’m trying to use some Kotlin/JS code in a Vue+Typescript app and I’m not sure how to properly use the code there as it has some dependencies like the Ktor client.

[turansky]

You can create standalone Kotlin/JS libraries on the first step:
1. Mark library methods with DCE 'keep'
2. Use DCE = Kotlin + Kotlin dependencies are inside
3. Fix methods location via webpack if you need (com.example.test.mySuperMethod -> mySuperMethod)

[turansky]

Next steps depend on library type

[Evan R.]

Ah, DCE may have been killing me. Thanks for the tip!

[turansky]

ES6 libraries?

[turansky]

DCE can live with ES6 dependencies

[turansky]

WA exists

[ankushg]

@turansky can you elaborate on

Fix methods location via webpack if you need (com.example.test.mySuperMethod -> mySuperMethod)?

I'm currently doing some dumb stuff to make top-level package-less aliases in my jsMain, but this sounds like it might be smarter 😅

[turansky]

https://webpack.js.org/configuration/output/#outputlibrary

[turansky]

// webpack.config.d/output.js
config.output.libraryTarget = 'umd';
config.output.libraryExport = ['com', 'example', 'test', 'mySuperMethod'];

[ankushg]

Iiinteresting, thanks for that. Do you do this in the JS code that's consuming your Kotlin/JS library, or do you do it as part of building your Kotlin/JS library?

[turansky]

It is part of library building.
Kotlin/JS library output - single class (Web component in our case).

[Ilya Goncharov [JB]]

@ankushg @Evan R. Please consider that webpack’s output.library properties works incorrectly when source maps enabled in Kotlin/JS until 1.3.50
https://youtrack.jetbrains.com/issue/KT-33288

[Evan R.]

Thanks for the tip Ilya!