make V.js compile

compiler/gen_js.v

@@ -46,6 +46,11 @@ fn types_to_c(types []Type, table &Table) string {
 			sb.write(field.name)
 			sb.writeln('; // $field.typ')
 		}
+		sb.writeln('
+constructor(obj) {
+    obj && Object.assign(this, obj);
+}
+')
 		sb.writeln('}\n')
 	}
 	return sb.str()

compiler/main.v

@@ -258,8 +258,9 @@ fn (v mut V) compile() {
 		// TODO
 		//cgen.genln('i64 total_m = 0; // For counting total RAM allocated')
 		//if v.pref.is_test {
+		$if !js {
 			cgen.genln('int g_test_ok = 1; ')
-		//}
+		}
 		if 'json' in v.table.imports {
 			cgen.genln('
 #define js_get(object, key) cJSON_GetObjectItemCaseSensitive((object), (key))
@@ -474,7 +475,7 @@ fn (v &V) v_files_from_dir(dir string) []string {
 		if file.ends_with('_mac.v') && v.os != .mac {
 			continue
 		}
-		if file.ends_with('_js.v') {
+		if file.ends_with('_js.v') && v.os != .js {
 			continue
 		}
 		if file.ends_with('_nix.v') && (v.os == .windows || v.os == .msvc) {

vlib/builtin/js/string.v

@@ -309,10 +309,5 @@ pub fn (s string) hash() int {
 }
 
 pub fn (s string) bytes() []byte {
-	if s.len == 0 {
 	return []byte
 }
-	mut buf := [byte(0)].repeat2(s.len)
-	C.memcpy(buf.data, s.str, s.len)
-	return buf
-}