Function parseChordSymbol

parseChordSymbol(text: string): ChordData
Parse a lead-sheet chord symbol into a Chord.

Accepts <root><quality>[/<bass>], e.g. Cmaj7, F#m7b5, Bb7, C/G, C6/9, C6/9/E. Root and bass letters are case-insensitive, matching parseNote. A / is ambiguous between a slash bass and the 6/9 quality; the text splits at the last / whose right-hand side is a valid bare note preceded by a recognized quality, so 6/9 (with or without a further slash bass) parses as a quality.

The parsed chord carries the root/bass spellings as enharmonic hints (rootSpelling/bassSpelling) so formatChordSymbol can reproduce flat spellings such as Bbmaj7 instead of respelling them with sharps.
Parameters
- text: string
  The chord symbol text.
Returns ChordData
The parsed chord.
Throws
If the root or quality is not recognized.
Example
```
import { parseChordSymbol, formatChordSymbol } from '@libraz/libcantus';
const c = parseChordSymbol('Bbmaj7');
formatChordSymbol(c); // 'Bbmaj7' — flat spelling is preserved on round-trip
```
- Defined in theory/symbol/index.ts:166