diff --git a/vlib/builtin/js/jsfns.js.v b/vlib/builtin/js/jsfns.js.v
index 2b5d973dd3..b2ea15de27 100644
--- a/vlib/builtin/js/jsfns.js.v
+++ b/vlib/builtin/js/jsfns.js.v
@@ -123,26 +123,26 @@ fn native_str_arr_len(arr []JS.String) int {
 }
 
 // Top level functions
-fn JS.eval(string) any
-fn JS.parseInt(string, f64) JS.Number
-fn JS.parseFloat(string) JS.Number
+fn JS.eval(JS.String) JS.Any
+fn JS.parseInt(JS.String, f64) JS.Number
+fn JS.parseFloat(JS.String) JS.Number
 fn JS.isNaN(f64) bool
 fn JS.isFinite(f64) bool
-fn JS.decodeURI(string) string
-fn JS.decodeURIComponent(string) string
-fn JS.encodeURI(string) string
+fn JS.decodeURI(JS.String) JS.String
+fn JS.decodeURIComponent(JS.String) JS.String
+fn JS.encodeURI(JS.String) JS.String
 
-type EncodeURIComponentArg = bool | f64 | string
+type EncodeURIComponentArg = JS.String | bool | f64
 
-fn JS.encodeURIComponent(EncodeURIComponentArg) string
-fn JS.escape(string) string
-fn JS.unescape(string) string
+fn JS.encodeURIComponent(EncodeURIComponentArg) JS.String
+fn JS.escape(JS.String) JS.String
+fn JS.unescape(JS.String) JS.String
 
 // console
 fn JS.console.assert(bool, ...any)
 fn JS.console.clear()
-fn JS.console.count(string)
-fn JS.console.countReset(string)
+fn JS.console.count(JS.String)
+fn JS.console.countReset(JS.String)
 fn JS.console.debug(...any)
 fn JS.console.dir(any, any)
 fn JS.console.dirxml(...any)
@@ -154,8 +154,8 @@ fn JS.console.groupEnd()
 fn JS.console.info(...any)
 fn JS.console.log(...any)
 fn JS.console.table(any, []string)
-fn JS.console.time(string)
-fn JS.console.timeEnd(string)
+fn JS.console.time(JS.String)
+fn JS.console.timeEnd(JS.String)
 fn JS.console.timeLog(string, ...any)
 fn JS.console.timeStamp(string)
 fn JS.console.trace(...any)
@@ -182,5 +182,5 @@ fn JS.Math.sqrt(f64) f64
 fn JS.Math.tan(f64) f64
 
 // JSON
-fn JS.JSON.stringify(any) string
+fn JS.JSON.stringify(any) JS.String
 fn JS.JSON.parse(string) any
diff --git a/vlib/builtin/js/string.js.v b/vlib/builtin/js/string.js.v
index 1b862044f1..33ec080dce 100644
--- a/vlib/builtin/js/string.js.v
+++ b/vlib/builtin/js/string.js.v
@@ -205,53 +205,53 @@ pub fn (s string) hash() int {
 
 // int returns the value of the string as an integer `'1'.int() == 1`.
 pub fn (s string) int() int {
-	return int(JS.parseInt(s))
+	return int(JS.parseInt(s.str))
 }
 
 // i64 returns the value of the string as i64 `'1'.i64() == i64(1)`.
 pub fn (s string) i64() i64 {
-	return i64(JS.parseInt(s))
+	return i64(JS.parseInt(s.str))
 }
 
 // i8 returns the value of the string as i8 `'1'.i8() == i8(1)`.
 pub fn (s string) i8() i8 {
-	return i8(JS.parseInt(s))
+	return i8(JS.parseInt(s.str))
 }
 
 // i16 returns the value of the string as i16 `'1'.i16() == i16(1)`.
 pub fn (s string) i16() i16 {
-	return i16(JS.parseInt(s))
+	return i16(JS.parseInt(s.str))
 }
 
 // f32 returns the value of the string as f32 `'1.0'.f32() == f32(1)`.
 pub fn (s string) f32() f32 {
 	// return C.atof(&char(s.str))
-	return f32(JS.parseFloat(s))
+	return f32(JS.parseFloat(s.str))
 }
 
 // f64 returns the value of the string as f64 `'1.0'.f64() == f64(1)`.
 pub fn (s string) f64() f64 {
-	return f64(JS.parseFloat(s))
+	return f64(JS.parseFloat(s.str))
 }
 
 // u16 returns the value of the string as u16 `'1'.u16() == u16(1)`.
 pub fn (s string) u16() u16 {
-	return u16(JS.parseInt(s))
+	return u16(JS.parseInt(s.str))
 }
 
 // u32 returns the value of the string as u32 `'1'.u32() == u32(1)`.
 pub fn (s string) u32() u32 {
-	return u32(JS.parseInt(s))
+	return u32(JS.parseInt(s.str))
 }
 
 // u64 returns the value of the string as u64 `'1'.u64() == u64(1)`.
 pub fn (s string) u64() u64 {
-	return u64(JS.parseInt(s))
+	return u64(JS.parseInt(s.str))
 }
 
 pub fn (s string) byte() u64 {
 	res := byte(0)
-	#res.val = byte(JS.parseInt(s))
+	#res.val = byte(JS.parseInt(s.str))
 
 	return res
 }
diff --git a/vlib/v/gen/js/tests/js.v b/vlib/v/gen/js/tests/js.v
index 90bcb189ab..82d2849a45 100644
--- a/vlib/v/gen/js/tests/js.v
+++ b/vlib/v/gen/js/tests/js.v
@@ -30,7 +30,18 @@ fn class(extends string, instanceof int) {
 fn main() {
 	println('Hello from V.js!')
 	println(JS.Math.atan2(1, 0))
-	println(JS.eval("console.log('Hello!')"))
+	non := JS.eval("console.log('Hello!')".str)
+	if isnil (non) {
+		println('non=nil')
+	}
+	ren := int(JS.eval('3'.str))
+	if ren != 0 {
+		println('ren=$ren')
+	}
+	res := string(JS.eval('"3"'.str))
+	if res != '' {
+		println('res=$res')
+	}
 	mut a := 1
 	a *= 2
 	a += 3
@@ -43,7 +54,7 @@ fn main() {
 	println(c)
 	println('int(1.5) == "${int(1.5)}"')
 	d := int(10) + f32(127)
-	println('typeof (int + f32) == "${typeof(d)}"')
+	println('typeof (int + f32) == "${typeof(d).name}"')
 	_ = 'done'
 	{
 		_ = 'block'