/**
 * A date, or undefined for anything that isn't one — never an Invalid Date.
 *
 * Takes `unknown` because that's what a raw record field is: callers shouldn't
 * have to assert a type they haven't checked yet. Undefined rather than null so
 * an absent date spreads straight into an optional field, like
 * `asNonEmptyString` below.
 */
export function parseDate(value: unknown) {
  if (typeof value !== 'string') return undefined;
  const parsed = new Date(value);
  return isNaN(parsed.getTime()) ? undefined : parsed;
}

export function asNonEmptyString(value: unknown) {
  return typeof value === 'string' && value.length > 0 ? value : undefined;
}