convert to JSDoc comments

sanitize.ts

@@ -1,3 +1,13 @@
+/**
+ * Sanitizes a FormData value by key, returning a trimmed string.
+ * If the key is not present, it throws an error or returns a fallback value.
+ * @param data - The FormData object to sanitize.
+ * @param key - The key to look for in the FormData.
+ * @param fallback - Optional fallback value to return if the key is not found.
+ * @returns The sanitized string value or the fallback value.
+ * @throws Error if the key is required and not found.
+ * @template Fallback - The type of the fallback value.
+ */
 export function sanitize(data: FormData, key: string): string;
 export function sanitize<Fallback>(
 	data: FormData,