Roughing out the demo app

node_modules/widest-line/index.js

@@ -0,0 +1,8 @@
+'use strict';
+const stringWidth = require('string-width');
+
+module.exports = input => {
+	let max = 0;
+	for (const s of input.split('\n')) max = Math.max(max, stringWidth(s));
+	return max;
+};