Fix __js__ and Utf8 deprecation warnings

src/yaml/Parser.hx

@@ -1980,9 +1980,13 @@ class Parser
 
 	static function createUtf8Char(hex:Int):String
 	{
+		#if haxe4
+		return String.fromCharCode(hex);
+		#else
 		var utf8 = new Utf8(1);
 		utf8.addChar(hex);
 		return utf8.toString();
+		#end
 	}
 
 	public static var HEXADECIMAL_ESCAPE_SEQUENCES:IntMap<Int> = 

src/yaml/type/YTimestamp.hx

@@ -116,8 +116,12 @@ class YTimestamp extends YamlType<Date, String>
 		#elseif flash
 		return untyped _global["Date"];
 		#elseif js
+		#if haxe4
+		return js.Syntax.code("Date");
+		#else
 		return untyped __js__("Date");
 		#end
+		#end
 		return null;
 	}
 	#end

src/yaml/util/Dates.hx

@@ -36,8 +36,12 @@ class Dates
 		#elseif flash
 		return untyped _global["Date"];
 		#elseif js
+		#if haxe4
+		return js.Syntax.code("Date");
+		#else
 		return untyped __js__("Date");
 		#end
+		#end
 		return null;
 	}
 
@@ -54,7 +58,11 @@ class Dates
 	public static function toISOString(date:Date):String
 	{
 		var NativeDate = getNativeDate();
+		#if haxe4
+		var d = js.Syntax.construct(NativeDate, date.getTime());
+		#else
 		var d = untyped __new__(NativeDate, date.getTime());
+		#end
 
 		return d.getUTCFullYear() + '-'
 			+ StringTools.lpad("" + (d.getUTCMonth() + 1), "0", 2) + '-'

src/yaml/util/Ints.hx

@@ -102,8 +102,13 @@ class Ints
 
 		#if js
 
+		#if haxe4
+		var v = js.Syntax.code("parseInt")(value, radix);
+		return (js.Syntax.code("isNaN")(v)) ? null : v;
+		#else
 		var v = untyped __js__("parseInt")(value, radix);
 		return (untyped __js__("isNaN")(v)) ? null : v;
+		#end
 
 		#elseif flash9