[chore] Convert some settings / admin panel JS to TypeScript (#2247)

* initial conversion of STUFF to typescript

* more stuff

* update babel deps, include commonjs transform

* update bundler & eslint configuration

* eslint --fix

* upgrade deps

* update docs, build stuff, peripheral stuff

---------

Co-authored-by: f0x <f0x@cthu.lu>

web/source/index.js

@@ -17,8 +17,6 @@
 	along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-"use strict";
-
 const skulk = require("skulk");
 const fs = require("fs");
 const path = require("path");
@@ -70,10 +68,17 @@ skulk({
 			entryFile: "settings",
 			outputFile: "settings.js",
 			prodCfg: prodCfg,
+			plugin: [
+				// Additional settings for TS are passed from tsconfig.json.
+				// See: https://github.com/TypeStrong/tsify#tsconfigjson
+				["tsify"]
+			],
 			transform: [
+				// tsify is called before babelify, so we're just babelifying
+				// commonjs here, no need for the typescript preset.
 				["babelify", {
 					global: true,
-					ignore: [/node_modules\/(?!nanoid)/]
+					ignore: [/node_modules\/(?!nanoid)/],
 				}]
 			],
 			presets: [