Function scaleSystemOf

scaleSystemOf(scale: KeyScale | ScaleNameInput): ScaleSystem | undefined
The system a scale belongs to.

A name — canonical or an alias — is answered exactly: 'nahawand' is a maqam even though its mask is the natural minor's. A KeyScale carries no tradition, so it is answered by its mask, under the Western reading of that mask; a mask that is no built-in scale answers undefined.
Parameters
- scale: KeyScale | ScaleNameInput
  The scale name, or a key/scale to read the mask of.
Returns ScaleSystem | undefined
The system, or undefined for a mask that names no built-in scale.
Throws
If scale is a string naming no built-in scale. An unknown name is a typo, and answering it the way an unrecognised mask is answered would hide that.
Example
```
import { scaleSystemOf, majorKey } from '@libraz/libcantus';
scaleSystemOf('harmonicMinor'); // 'common-practice'
scaleSystemOf('dorian'); // 'modal'
scaleSystemOf('hijaz'); // 'non-functional'
scaleSystemOf(majorKey(0)); // 'common-practice'
```
- Defined in src/theory/scale/system.ts:139