Asking in <#C0B8L3U69|javascript> because I didn’t get a response in <#C3PQML5NU|multiplatform>… Do...

# javascript

[natpryce]

Asking in #javascript because I didn’t get a response in #multiplatform…

Does anyone have an example of a multiplatform JVM & Javascript project that uses the W3C DOM API? I’m not sure how to define the expect declarations because the DOM API is mapped to interfaces in the JVM platform and classes in the Javascript platform. The DOM objects are provided by factories in both platforms, so my code only needs to use the DOM objects, not instantiate the classes nor implement the interfaces. What should the expect declaration be?

[turansky]

Which DOM class you want to use as alias?

[turansky]

Definetely works following example:

// common
expect class Color

// JS
@Suppress("ACTUAL_WITHOUT_EXPECT")
actual typealias Color = csstype.Color

csstype.Color - external interface

[natpryce]

And what would the declaration be for the JVM platform?

[natpryce]

I want to use the W3C XML DOM APIs in the org.w3c package – Node, Element, Attr etc.

[natpryce]

For example, on the JVM platform, Element is declared as public interface Element extends Node while on the JS platform it is declared as public abstract external class Element.

[natpryce]

On both platforms, the types are declared in org.w3c.dom, so I want to write my code that uses the DOM in the common module and declare an expect function that loads a document, implemented by platform-specific actual code in the JVM and JS modules.

[natpryce]

But I’ve not been able to work out how to declare that

[turansky]

Common = Like in JVM
JS - with Suppress

[natpryce]

So the common module would have to declare `expect`s for all the types in the org.w3c package?

[natpryce]

(I was hoping to avoid that because both platforms already have the org.w3c package)

[turansky]

Looks like it can be generated 🙂

[natpryce]

Yes… that’s looking like the best approach

[natpryce]

Thanks

[turansky]

FYI - latest Browser declarations you can find here

[turansky]

What is the final goal? If it’s not a secret

[natpryce]

I have a library for fuzz-testing various structured data formats and encodings. It is compiled to JVM & JS with a Makefile and the command line Kotlin compiler. The multi-platform build uses a directory of cross-platform code and directories of platform-specific code, and each platform build compiles all the cross-platform code and platform-specific code as a single compilation unit. It works very well, and thanks to Make builds much faster than Gradle. However, there is so little support for the command-line tools that upgrading to 1.8 and the new IR is very difficult. So if I can get a low-maintenance project structure working with kotlin-multiplatform I’ll bite the bullet and move to Gradle.

[turansky]

I expect desynchronization between JVM and JS implementations.
How you will calculate common part between JVM and JS?