Function modularScale

src/helpers/modularScale.js:52–72

(
  steps: number,
  base?: number | string = '1em',
  ratio?: ModularScaleRatio = 1.333,
)

 * }
 */
export default function modularScale(
  steps: number,
  base?: number | string = '1em',
  ratio?: ModularScaleRatio = 1.333,
): string {
  if (typeof steps !== 'number') {
    throw new PolishedError(42)
  }
  if (typeof ratio === 'string' && !ratioNames[ratio]) {
    throw new PolishedError(43)
  }

  const [realBase, unit] = typeof base === 'string' ? getValueAndUnit(base) : [base, '']
  const realRatio = typeof ratio === 'string' ? getRatio(ratio) : ratio

  if (typeof realBase === 'string') {
    throw new PolishedError(44, base)
  }

  return `${realBase * realRatio ** steps}${unit || ''}`
}