I'm testing Kore Studio and the empty project.
If I set a breakpoint in the update function (that calls trace), it trace three times and then breaks. Why doesn't it break in the first iteration?
Although its breaking, every variable I try to watch display an 'variable is not definied' error.

package;

import kha.Framebuffer;
import kha.Scheduler;
import kha.System;

class Empty {
	public function new() {
		System.notifyOnRender(render);
		Scheduler.addTimeTask(update, 0, 1 / 60);
	}

	function update(): Void {
		var i = 0;
		i += 2;

		var a = 3;
		a += i;

		var t:Float = System.time;

		trace(i + t);
	}

	function render(framebuffer: Framebuffer): Void {		
	}
}

I tried the HaxeDeveloper project (project-debug-html5.hxproj) but before building I get this error in Chrome and a blank screen.

SystemImpl.hx:56 ReferenceError: require is not defined
	at Function.kha_SystemImpl.init (SystemImpl.hx:64)
	at Function.kha_System.init (System.hx:26)
	at Function.Main.main (Main.hx:7)
	at SyncBuilder.hx:9
	at SyncBuilder.hx:9

The HTML5 target doesn't appear to work outside the embedded Chrome in Kode Studio.

How to build and debug with HTML5?

The debugger doesn't attach immediately. Normally Kha waits a little inside System.init to make up for that, but that has recently been disabled to pseudo-fix some electron/v8 problem (will likely be reenabled in the next version).
To build for the actual html5 target which works in a browser, hit F1, enter "compile", hit enter, select html5.

Oh and have a look into the generated kha.js - maybe you're trying to look at variables which are optimized away.

@Robert I see. The debug build uses ide specific code.
With "function NOP(variable:Dynamic) {}" I can workaround the variable optimization.

I have my workflow setted now.
Thank you for the help.