Function refForCatalogId

refForCatalogId(catalogId: string): string | undefined
The preference reference for a catalogue id; the inverse of catalogIdForRef.
Parameters
- catalogId: string
  A kehto catalogue id.
Returns string | undefined
The coordinate or snapshot id, or undefined when the id is not a napplet's.
Example
```
refForCatalogId(`nip5d:15129:${pubkey}`); // `15129:${pubkey}:`
```