KhaHotReload

Code patching without project rebuilding. Supported targets:

• html5
• debug-html5 (Electron)
• krom? (not tested)

You can download this sample and test with VSCode (select and run HTML5-watch), or use CLI:

node Kha/make html5 --server &
node Kha/make html5 --watch

Setup for personal project

• Copy Libraries/hotml folder to your project folder.
• Add #if hotml new hotml.client.Client(); #end at start of Main.main().
• Add this block to khafile.js (before resolve(project);):

if (process.argv.includes("--watch")) { // run only in watch mode
	project.targetOptions.html5.unsafeEval = true; // allow eval in electron
	let libPath = project.addLibrary('hotml'); // client code for code-patching
	project.addDefine('js_classic'); // to support constructors patching, optional
	// start websocket server that will send type diffs to client
	const path = require('path');
	if (!libPath) libPath = path.resolve('./Libraries/hotml');
	const Server = require(`${libPath}/bin/server.js`).hotml.server.Main;
	// path to target build folder and main js file.
	const server = new Server(`${path.resolve('.')}/build/${platform}`, 'kha.js');
	callbacks.postHaxeRecompilation = () => {
		server.reload(); // parse js file every compilation
	}
	// for assets reloading
	callbacks.postAssetReexporting = (path) => {
		server.reloadAsset(path);
	}
}

Done. For VSCode you also need to copy .vscode/ launch option and tasks.

Debug hot-reload server

Libraries/hotml is separated VSCode project with personal build task for server side. Parser.hx has some static vars for detected types tracing.

Usage for other frameworks / pure Haxe projects

This khamake plugin does not depend on Kha ecosystem, except for khamake's file watcher and postHaxeRecompilation callback, so you can use it as NodeJS app with any other build system. The only requirements is watch mode for js target and such callback.

Thanks

To Robert Konrad with initial idea and implementation in Krom and KodeGarden.