chore: init frontend-source directory with tooling scaffold

Former-commit-id: 435fb8e3e4f8e334ad3b0e95052edbdd9547d197

frontend-source/scripts/node_modules/ansi-regex/index.d.ts

@@ -0,0 +1,33 @@
+export type Options = {
+	/**
+	Match only the first ANSI escape.
+
+	@default false
+	*/
+	readonly onlyFirst: boolean;
+};
+
+/**
+Regular expression for matching ANSI escape codes.
+
+@example
+```
+import ansiRegex from 'ansi-regex';
+
+ansiRegex().test('\u001B[4mcake\u001B[0m');
+//=> true
+
+ansiRegex().test('cake');
+//=> false
+
+'\u001B[4mcake\u001B[0m'.match(ansiRegex());
+//=> ['\u001B[4m', '\u001B[0m']
+
+'\u001B[4mcake\u001B[0m'.match(ansiRegex({onlyFirst: true}));
+//=> ['\u001B[4m']
+
+'\u001B]8;;https://github.com\u0007click\u001B]8;;\u0007'.match(ansiRegex());
+//=> ['\u001B]8;;https://github.com\u0007', '\u001B]8;;\u0007']
+```
+*/
+export default function ansiRegex(options?: Options): RegExp;