Fix jsinterop: added option target which now has only one proper value wasm32 (#2694)

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/jvm/CommandLine.kt

@@ -68,6 +68,13 @@ fun getCInteropArguments(): List<OptionDescriptor> {
     return (options + getCommonInteropArguments())
 }
 
+fun getJSInteropArguments(): List<OptionDescriptor> {
+    val options = listOf(
+            OptionDescriptor(ArgType.Choice(listOf("wasm32")), "target", description = "wasm target to compile to", defaultValue = "wasm32")
+    )
+    return (options + getCommonInteropArguments())
+}
+
 internal fun warn(msg: String) {
     println("warning: $msg")
 }

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/wasm/StubGenerator.kt

@@ -4,7 +4,7 @@ import org.jetbrains.kotlin.konan.file.File
 import org.jetbrains.kotlin.native.interop.gen.argsToCompiler
 import org.jetbrains.kotlin.native.interop.gen.wasm.idl.*
 import org.jetbrains.kliopt.ArgParser
-import org.jetbrains.kotlin.native.interop.tool.getCommonInteropArguments
+import org.jetbrains.kotlin.native.interop.tool.getJSInteropArguments
 import org.jetbrains.kotlin.native.interop.tool.getValuesAsArray
 
 fun kotlinHeader(packageName: String): String {
@@ -393,7 +393,7 @@ const val idlMathPackage = "kotlinx.interop.wasm.math"
 const val idlDomPackage = "kotlinx.interop.wasm.dom"
 
 fun processIdlLib(args: Array<String>, additionalArgs: Map<String, Any> = mapOf()): Array<String>? {
-    val argParser = ArgParser(getCommonInteropArguments(), useDefaultHelpShortName = false)
+    val argParser = ArgParser(getJSInteropArguments(), useDefaultHelpShortName = false)
     if (!argParser.parse(args))
         return null
     // TODO: Refactor me.