chore: init frontend-source directory with tooling scaffold

Former-commit-id: 435fb8e3e4f8e334ad3b0e95052edbdd9547d197

frontend-source/scripts/node_modules/strip-ansi/index.js

@@ -0,0 +1,19 @@
+import ansiRegex from 'ansi-regex';
+
+const regex = ansiRegex();
+
+export default function stripAnsi(string) {
+	if (typeof string !== 'string') {
+		throw new TypeError(`Expected a \`string\`, got \`${typeof string}\``);
+	}
+
+	// Fast path: ANSI codes require ESC (7-bit) or CSI (8-bit) introducer
+	if (!string.includes('\u001B') && !string.includes('\u009B')) {
+		return string;
+	}
+
+	// Even though the regex is global, we don't need to reset the `.lastIndex`
+	// because unlike `.exec()` and `.test()`, `.replace()` does it automatically
+	// and doing it manually has a performance penalty.
+	return string.replace(regex, '');
+}