My Kotlin/JS projects don't work after upgrade from Kotlin 1.5.0 to Kotlin 1.5.10 because `build.gra...

# javascript

[Robert Jaros]

My Kotlin/JS projects don't work after upgrade from Kotlin 1.5.0 to Kotlin 1.5.10 because build.gradle.kts doesn't compile. What happened?

[Robert Jaros]

* What went wrong:
Script compilation errors:

  Line 35:                     proxy = mapOf(
                                       ^ Type mismatch: inferred type is Map<String, Any> but MutableMap<String, Any>? was expected

  Line 39:                     contentBase = listOf("$buildDir/processedResources/js/main")
                                             ^ Type mismatch: inferred type is List<String> but MutableList<String>? was expected

2 errors

[Robert Jaros]

I'm on Gradle 6.9

[Robert Jaros]

It works fine when I go back to 1.5.0

[Robert Jaros]

It fails on DevServer configuration in gradle:

devServer = KotlinWebpackConfig.DevServer(
                    open = false,
                    port = 3000,
                    proxy = mapOf(
                        "/kv/*" to "<http://localhost:8080>",
                        "/kvws/*" to mapOf("target" to "<ws://localhost:8080>", "ws" to true)
                    ),
                    contentBase = listOf("$buildDir/processedResources/js/main")
                )

[Robert Jaros]

It compiles when I remove both proxy and contentBase options.

[christophsturm]

i think DevServer is private, i had that problem months ago

[russhwolf]

Change mapOf to mutableMapOf and listOf to mutableListOf at the indicated lines.

[russhwolf]

The types changed in the gradle dsl there for some reason

[christophsturm]

the supported way to do what you want is via webpack.config.d

[christophsturm]

something like

config.devServer = Object.assign(
    {},
    config.devServer || {},
    {
        port: 3000,
        proxy: {
            '/api': {
                target: '<http://localhost:8080>',
                logLevel: 'debug'
            }
        }
    }
)

[Robert Jaros]

It's not private

[Robert Jaros]

but it's now annotated @Suppress("unused")

[turansky]

It works fine with following patch

[Robert Jaros]

A breaking change for my projects in the patch release ... ;-(

[turansky]

New major dev-server release required for this issue

[turansky]

And it must work without patches

[turansky]

cc @Ilya Goncharov [JB]

[turansky]

Looks like port configuration required only. Issue already exists

[turansky]

Also I see invalid static parameter configuration. Unexisted folder declared

[Robert Jaros]

Do I understand correctly I need to replace contentBase = listOf(...) with static = mutableListOf(...) in my build.gradle.kts and it should work again with new dev server version?

[Robert Jaros]

I love documenting breaking changes in my migration guide every minor release 😉

[turansky]

1 Kotlin release ~= 20 Webpack releases

[turansky]

1.5.10 - second step of migration to Webpack 5, but not final. Dev server API isn’t stable