Search code examples
javascriptkotlinkotlin-interop

String::toByteArray() does not compile in Kotlin [js]

The following code does not compile in Kotlin Js:

"My String".toByteArray()

Any ideas why?

The error returned is:

[INFO]
[INFO] --- kotlin-maven-plugin:1.1.51:js (compile-js) @ client ---
[INFO] Kotlin version 1.1.51 (JRE 1.8.0_144-b01)
[INFO] Compiling Kotlin sources from [C:\myproject\src\main\kotlin]
[ERROR] C:\myproject\src\main\kotlin\mypackage\MyFile.kt: (15, 48) Unresolved reference. None of the following candidates is applicable because of receiver type mismatch:
public fun Array<out Byte>.toByteArray(): ByteArray defined in kotlin.collections
public fun Collection<Byte>.toByteArray(): ByteArray defined in kotlin.collections
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:

The same code compiles in the non-javascript Kotlin compilation:

[INFO] --- kotlin-maven-plugin:1.1.51:compile (compile) @ client ---
[INFO] Kotlin version 1.1.51 (JRE 1.8.0_144-b01)
[INFO] Compiling Kotlin sources from [C:\myproject\src\main\kotlin, C:\myproject\src\main\java]
[INFO] Module name is client
[INFO]
Solution

  • String.toByteArray function is not provided in the Kotlin/JS standard library.

    The documentation of that function has a section about Platform and version requirements. JVM there means that it's only available on Kotlin/JVM.