List Format

Requirements

• Export listFormat as both a named and default export. Return a string without changing the input array or options.
• Ignore empty strings (""); keep all other strings exactly as given, including whitespace-only strings.
• For zero items return ""; for one return that item; for two return "A and B"; for three or more return "A, B and C".
• options.unique defaults to false. When true, remove case-sensitive duplicates while preserving their first occurrence.
• options.sorted defaults to false. When true, sort a copy using JavaScript default string ordering. Filter empty strings, then deduplicate, then sort, then truncate.
• options.length defaults to 0 (no limit). A positive integer limits visible items; an integer less than or equal to zero shows all items. If entries remain, append "1 other" or "N others" as the final list entry.
• Inputs are dense arrays of strings and valid options. TypeScript accepts readonly input arrays.

Examples

Input: listFormat(["Alice", "Bob", "Charlie"])
Output: "Alice, Bob and Charlie"

Input: listFormat(["Alice", "Bob", "Charlie", "Dora"], { length: 2 })
Output: "Alice, Bob and 2 others"

Input: listFormat(["Bob", "Alice", "Bob"], { sorted: true, unique: true, length: 1 })
Output: "Alice and 1 other"