[Wasm] Migrate usages of @JsFun to js("code")

libraries/kotlin.test/wasm/src/main/kotlin/kotlin/test/JasmineLikeAdapter.kt

@@ -9,23 +9,25 @@ import kotlin.test.FrameworkAdapter
 import kotlin.js.Promise
 
 // Need to wrap into additional lambdas so that js launcher will work without Mocha or any other testing framework
-@JsFun("(name, fn) => describe(name, fn)")
-private external fun describe(name: String, fn: () -> Unit)
+private fun describe(name: String, fn: () -> Unit): Unit =
+    js("describe(name, fn)")
 
-@JsFun("(name, fn) => xdescribe(name, fn)")
-private external fun xdescribe(name: String, fn: () -> Unit)
+private fun xdescribe(name: String, fn: () -> Unit): Unit =
+    js("xdescribe(name, fn)")
 
-@JsFun("(name, fn) => it(name, fn)")
-private external fun it(name: String, fn: () -> Any?)
+private fun it(name: String, fn: () -> Any?): Unit =
+    js("it(name, fn)")
 
-@JsFun("(name, fn) => xit(name, fn)")
-private external fun xit(name: String, fn: () -> Any?)
+private fun xit(name: String, fn: () -> Any?): Unit =
+    js("xit(name, fn)")
 
-@JsFun("(e) => { throw e }")
-private external fun jsThrow(jsException: Dynamic)
+private fun jsThrow(jsException: Dynamic) {
+    js("throw e")
+}
 
-@JsFun("(message, stack) => { const e = new Error(); e.message = message; e.stack = stack; return e; }")
-private external fun throwableToJsError(message: String, stack: String): Dynamic
+private fun throwableToJsError(message: String, stack: String): Dynamic {
+    js("var e = new Error(); e.message = message; e.stack = stack; return e;")
+}
 
 private fun Throwable.toJsError(): Dynamic =
     throwableToJsError(message ?: "", stackTraceToString())

libraries/kotlin.test/wasm/src/main/kotlin/kotlin/test/TestApi.kt

@@ -39,8 +39,8 @@ internal fun test(name: String, ignored: Boolean, testFn: () -> Any?) {
 
 internal var currentAdapter: FrameworkAdapter? = null
 
-@JsFun("() => typeof describe === 'function' && typeof it === 'function'")
-private external fun isJasmine(): Boolean
+private fun isJasmine(): Boolean =
+    js("typeof describe === 'function' && typeof it === 'function'")
 
 internal fun adapter(): FrameworkAdapter {
     val result = currentAdapter ?: if (isJasmine()) JasmineLikeAdapter() else TeamcityAdapter()