Function isEmpty

packages/forms/signals/src/api/rules/validation/util.ts:59–64

(value: unknown)

 * Checks if the given value is considered empty. Empty values are: null, undefined, '', false, NaN.
 */
export function isEmpty(value: unknown): boolean {
  if (typeof value === 'number') {
    return isNaN(value);
  }
  return value === '' || value === false || value == null;
}

/**
 * Normalizes validation errors (which can be a single error, an array of errors, or undefined)