Function spellChord

spellChord(chord: ChordData, tonic: NoteData, key: KeyScale): NoteData[]
Spell a chord's tones, in the chord's own (tertian) order, relative to a key.

Diatonic chords spell exactly (e.g. G7 in C major -> G B D F). Chromatic chord tones take their conventional spelling; enharmonically ambiguous altered tensions may be spelled by the general convention rather than by chord function.
Parameters
- chord: ChordData
  The chord.
- tonic: NoteData
  The spelled tonic of the key.
- key: KeyScale
  The key/scale.
Returns NoteData[]
Spelled chord tones, root first.
Example
```
import { spellChord, noteNames, parseNote, majorKey, makeChord } from '@libraz/libcantus';
// G7 in C major
noteNames(spellChord(makeChord(7, 'dom7'), parseNote('C'), majorKey(0)));
// ['G', 'B', 'D', 'F']
```
- Defined in theory/spelling/index.ts:235