Function progression

src/progression.ts:174–187

(
  scaleType: ProgressionScale,
  count = 4
)

 * @param count e.g. 4
 */
export const progression = (
  scaleType: ProgressionScale,
  count = 4
): string[] => {
  if (scaleType === 'major' || scaleType === 'M') {
    return M(count);
  }

  if (scaleType === 'minor' || scaleType === 'm') {
    return m(count);
  }

  return [];
};