fix wasmJs fs

runtime/wasmJsMain/src/kotlinx/benchmark/NodeJsEngineSupport.kt

@@ -3,21 +3,37 @@ package kotlinx.benchmark
 import kotlin.time.DurationUnit
 import kotlin.time.toDuration
 
-@JsFun("(path, text) => require('fs').writeFileSync(path, text, 'utf8')")
-private external fun nodeJsWriteFile(path: String, text: String)
+@JsModule("fs")
+external object fs {
+    fun readFileSync(path: String, options: WriteFileOptions): String
+    fun writeFileSync(path: String, data: String, options: WriteFileOptions)
+}
+
+external interface WriteFileOptions : JsAny {
+    var encoding: String?
+    var mode: String?
+    var flag: String?
+}
+
+fun writeFileOptions(block: WriteFileOptions.() -> Unit): WriteFileOptions =
+    js("{}").unsafeCast<WriteFileOptions>().apply(block)
 
-@JsFun("(path) => require('fs').readFileSync(path, 'utf8')")
-private external fun nodeJsReadFile(path: String): String
+//
+//@JsModule("fs")
+//private external fun writeFileSync(path: String, text: String, options: String)
+//
+//@JsModule("fs")
+//private external fun readFileSync(path: String, options: String): String
 
 @JsFun("() => process.argv.slice(2).join(' ')")
 private external fun nodeJsArguments(): String
 
 internal object NodeJsEngineSupport : JsEngineSupport() {
     override fun writeFile(path: String, text: String) =
-        nodeJsWriteFile(path, text)
+        fs.writeFileSync(path, text, writeFileOptions { encoding = "utf8" } )
 
     override fun readFile(path: String): String =
-        nodeJsReadFile(path)
+        fs.readFileSync(path, writeFileOptions { encoding = "utf8" } )
 
     override fun arguments(): Array<out String> =
         nodeJsArguments().split(' ').toTypedArray()