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JVM AOT compiler currently generating JavaScript, C++, Haxe, with initial focus on Kotlin and games.
There is a newer version: 0.6.8
import haxe.io.UInt8Array;
import haxe.io.Bytes;
import haxe.io.BytesData;
import haxe.ds.Vector;

{{ HAXE_CLASS_ANNOTATIONS }}
class JA_B extends JA_0 {
	{{ HAXE_FIELD_ANNOTATIONS }} public var data:Bytes = null;
	#if cpp
	{{ HAXE_FIELD_ANNOTATIONS }} public var ptr:cpp.Pointer = null;
	#end

	{{ HAXE_CONSTRUCTOR_ANNOTATIONS }}
    public function new(length:Int, data: Bytes = null) {
        super();
        if (data == null) {
       		data = Bytes.alloc(length);
		} else {
        	length = data.length;
        }
        this.data = data;
        this.length = length;
        this.elementShift = 0;
        this.desc = "[B";
        #if cpp
        	ptr = cpp.NativeArray.address(data.getData(), 0).reinterpret();
        	rawPtr = ptr.rawCast();
        	//trace('rawPtr: $rawPtr');
		#end
    }

	{{ HAXE_METHOD_ANNOTATIONS }} override public function getElementBytesSize():Int return 1;
	{{ HAXE_METHOD_ANNOTATIONS }} override public function getBytes():Bytes return data;
	{{ HAXE_METHOD_ANNOTATIONS }} public function getBytesData():BytesData return getBytes().getData();

	{{ HAXE_METHOD_ANNOTATIONS }}
    static public function fromArray(items:Array) {
        if (items == null) return null;
        var out = new JA_B(items.length);
        for (n in 0 ... items.length) out.set(n, items[n]);
        return out;
    }

	{{ HAXE_METHOD_ANNOTATIONS }}
    static public function fromUInt8Array(items:UInt8Array) {
        if (items == null) return null;
        var out = new JA_B(items.length);
        for (n in 0 ... items.length) out.set(n, items[n]);
        return out;
    }

	{{ HAXE_METHOD_ANNOTATIONS }}
    static public function fromBytes(bytes:Bytes) return (bytes == null) ? null : new JA_B(bytes.length, bytes);

	#if cpp
	{{ HAXE_METHOD_ANNOTATIONS }} inline public function get(index:Int):Int return ptr[checkBounds(index)];
	{{ HAXE_METHOD_ANNOTATIONS }} inline public function set(index:Int, value:Int):Void ptr[checkBounds(index)] = value;
	#else
	{{ HAXE_METHOD_ANNOTATIONS }} public function get(index:Int):Int return N.i2b(this.data.get(checkBounds(index)));
	{{ HAXE_METHOD_ANNOTATIONS }} public function set(index:Int, value:Int):Void this.data.set(checkBounds(index), value);
	#end

	{{ HAXE_METHOD_ANNOTATIONS }} public function getBool(index:Int):Bool return get(index) != 0;
	{{ HAXE_METHOD_ANNOTATIONS }} public function setBool(index:Int, value:Bool):Void set(index, value ? 1 : 0);

	{{ HAXE_METHOD_ANNOTATIONS }} override public function getDynamic(index:Int):Dynamic return get(index);
	{{ HAXE_METHOD_ANNOTATIONS }} override public function setDynamic(index:Int, value:Dynamic) set(index, value);

	{{ HAXE_METHOD_ANNOTATIONS }}
    public function join(separator:String) {
        var out = '';
        for (n in 0 ... length) {
            if (n != 0) out += separator;
            out += get(n);
        }
        return out;
    }

	{{ HAXE_METHOD_ANNOTATIONS }}
    public override function clone() {
        var out = new JA_B(length);
        copy(this, out, 0, 0, length);
        return out;
    }

	{{ HAXE_METHOD_ANNOTATIONS }}
	public function fill(from: Int, to: Int, value: Int) {
		data.fill(from, to - from, value);
	}

	{{ HAXE_METHOD_ANNOTATIONS }}
    static public function copy(from:JA_B, to:JA_B, fromPos:Int, toPos:Int, length:Int) {
    	#if cpp
    	to.data.blit(toPos, from.data, fromPos, length);
    	#else
    	if (from == to && toPos > fromPos) {
			var n = length;
			while (--n >= 0) to.set(toPos + n, from.get(fromPos + n));
    	} else {
	        for (n in 0 ... length) to.set(toPos + n, from.get(fromPos + n));
		}
		#end
    }

	{{ HAXE_METHOD_ANNOTATIONS }}
	public function setArraySlice(startIndex: Int, array: Array) {
		for (n in 0...array.length) this.set(startIndex + n, array[n]);
	}

	{{ HAXE_METHOD_ANNOTATIONS }} override public function copyTo(srcPos: Int, dst: JA_0, dstPos: Int, length: Int) { copy(this, cast(dst, JA_B), srcPos, dstPos, length); }
}