PowerToys/src/modules/previewpane/MonacoPreviewHandler/generateLanguagesJson.html

<!doctype Html>
<html>
	<head>
		<meta charset="utf-8">
		<title>Monaco Preview Handler monaco_languages.json generator</title>
		<script src="monacoSRC/min/vs/loader.js"></script>
		<script src="monacoSpecialLanguages.js" type="module"></script>
		<script type="module">
			import {registerAdditionalLanguages} from "./monacoSpecialLanguages.js"
			function download(filename, text) {
				var element = document.createElement('a');
				element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
				element.setAttribute('download', filename);

				element.style.display = 'none';
				document.body.appendChild(element);

				element.click();

				document.body.removeChild(element);
			}
			require.config({ paths: { vs: 'monacoSRC/min/vs' } });
			require(['vs/editor/editor.main'], async function () {
				await registerAdditionalLanguages(monaco);
				download("monaco_languages.json", "{\"list\":"+ JSON.stringify(monaco.languages.getLanguages())+"}");
			});
		</script>
	</head>
	<body>
		<div id="container"></div>
	</body>
</html>