Switch to rollup for bundling

js/gui/index.mjs

@@ -0,0 +1,17 @@
+import {context} from '../graphics/index.mjs';
+import * as modules from './modules.mjs';
+
+export const elements = new Set();
+export let root;
+
+export function init() {
+	elements.clear();
+	root = modules.root();
+	console.log(root);
+}
+
+export function measureText(msg, font) {
+	context.font = font;
+	let measurement = context.measureText(msg);
+	return [measurement.width, measurement.height];
+}