ShunYamauchi

object().shape(
  {
    lunchStyles: array().min(1, 'お昼ごはんの選択は必須です。'),
    salads: array().when(
      ['lunchStyles', 'soups'],
      {
        is: (
          lunchStyles: string[],
          soups: string[]
        ) =>

ShunYamauchi

const validateLunchBoxStyle = function (this: any) {
  const {
    lunchStyles,
    soups,
    salads
  } = this.parent
  return !(
    lunchStyles.includes('lunchBox') &&
    soups.length === 0 &&
    salads.length === 0