| 1 | export function createUniqueItemIDAllocator(): (preferred: string, fallback: string) => string { |
| 2 | const used = new Set<string>(); |
| 3 | return (preferred, fallback) => { |
| 4 | const base = preferred || fallback; |
| 5 | if (!used.has(base)) { |
| 6 | used.add(base); |
| 7 | return base; |
| 8 | } |
| 9 | let suffix = 1; |
| 10 | while (used.has(`${base}#${suffix}`)) suffix += 1; |
| 11 | const id = `${base}#${suffix}`; |
| 12 | used.add(id); |
| 13 | return id; |
| 14 | }; |
| 15 | } |
| 16 |