I wrote a multiplatform library and publish it to ...

# javascript

[Ran]

I wrote a multiplatform library and publish it to maven local. Then I use the library in another KMP project. Everything is ok except cannot run js unit tests in the KMP project.
I add my library like the following:

sourceSets {
    val commonMain by getting {
      dependencies {
        implementation("com.calculation.multiplatform:MultiplatformBigDecimal:1.0.0-beta6")
      }
    }
    val commonTest by getting {
      dependencies {
        implementation(kotlin("test"))
        implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.2")
        implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.3.2")
      }
    }
  }

The ios unit tests and JVM unit tests work well. But when I run js unit tests, I got the following error:

Could not determine the dependencies of task ':jsTestPackageJson'.
> Could not resolve all dependencies for configuration ':jsTestNpm'.
   > Could not resolve com.calculation.multiplatform:MultiplatformBigDecimal:1.0.0-beta6.
     Required by:
         project :
      > No matching variant of com.calculation.multiplatform:MultiplatformBigDecimal:1.0.0-beta6 was found. The consumer was configured to find a usage of 'kotlin-runtime' of a library, preferably optimized for non-jvm, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'js', attribute 'org.jetbrains.kotlin.js.compiler' with value 'ir' but:

I cannot understand the message. Is there anyone who can tell me how can I solve this problem?

[Grégory Lureau]

I guess this lib doesn't provide an export to JS, is this lib open sourced?

[Big Chungus]

Both, lib and consumer needs to declare same js backend (ir in this case)

[Ran]

It's not open sourced yet.

[Ran]

You mean add @JsExport annotation for every class in my library?

[Big Chungus]

JsExport is irrelevant here. It's only needed when you want your compiled code visible to js consumers

[Grégory Lureau]

I think you want to look at the build.gradle of the MultiplatformBigDecimal lib, to get something like that:

kotlin { 
  js(IR) {
    browser { ... }
    binaries.library()
  }

(if you can copy just the js part, it could help us to help you)

[Ran]

js {
        useCommonJs()
        browser()
        testRuns["test"].executionTask.configure {
            useCommonJs()
        }
    }

[Ran]

This is my js part

[Grégory Lureau]

I guess it's related to the missing binaries.library() or binaries.executable() (doc)

[Ran]

Ok, I'm testing

[Ran]

Caused by: org.gradle.api.internal.tasks.DefaultTaskContainer$TaskCreationException: Could not create task ':jsTest'.

[Ran]

Cannot sync with config:

js(IR) {
        useCommonJs()
        browser()
        testRuns["test"].executionTask.configure {
            useCommonJs()
        }
        binaries.library()
    }

[Ran]

Oh, worked now, it's because the testRuns config

[Ran]

Remove it

[Ran]

js(IR) {
        useCommonJs()
        browser()
        binaries.library()
    }

This works for me

[Ran]

Thanks you guys

[Ran]

Another strange thing. Now I can run js unit test in my KMP project. But I just want to run unit tests in BigDecimalTest class. Actually it run tests in other classes

[Big Chungus]

Js ir backend does not support selective tests yet

[Big Chungus]

So even if you run a single rest via IDE, all tests are actually executed

[Big Chungus]

If selective tests are a must for you, your only option is to switch to the Legacy backend

[Ran]

Get it, thanks so much