Function lengthOrSize

packages/forms/src/validators.ts:38–49

* Extract the length property in case it's an array or a string. * Extract the size property in case it's a set. * Return null else. * @param value Either an array, set or undefined.

(value: unknown)

 * @param value Either an array, set or undefined.
 */
function lengthOrSize(value: unknown): number | null {
  // non-strict comparison is intentional, to check for both `null` and `undefined` values
  if (value == null) {
    return null;
  } else if (Array.isArray(value) || typeof value === 'string') {
    return value.length;
  } else if (value instanceof Set) {
    return value.size;
  }

  return null;
}

/**
 * @description