Function catalogIdForRef

catalogIdForRef(ref: string): string | undefined
kehto's catalogue id for a preference reference: a named or root coordinate, or a snapshot id. kehto keys named applets by publisher, kind and d, roots by publisher and kind, snapshots by event id.
Parameters
- ref: string
  35129:<pubkey>:<d>, 15129:<pubkey>: or a 64-hex snapshot id.
Returns string | undefined
The catalogue id, or undefined for anything else.
Example
```
catalogIdForRef(`35129:${pubkey}:notepad`); // `nip5d:35129:${pubkey}:notepad`
```