INNER CODE UNIT · TypeScript

romans

scribbletune/scribbletune · src/cli.ts:76

  const romans = progDigits.split('').map(digit => {
    const idx = Number(digit) - 1;
    if (idx < 0 || idx >= chordDegrees.length) {
      throw new TypeError(
        `Invalid progression digit "${digit}" in "${progDigits}"`
      );
    }
    return chordDegrees[idx];
  });

  return { chordDegrees: romans.join(' '), raw: progDigits };
};

const parseProgression = (
  root: string,
  mode: string,
  progressionInput: string
): string => {

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