export const assertNever = (value: never): never => {
  throw new Error(`Unhandled case: ${String(value)}`);
};

// Usage
type Status = 'pending' | 'approved' | 'rejected';

function handleStatus(status: Status) {
  switch (status) {
    case 'pending':
      return 'Waiting...';
    case 'approved':
      return 'Done!';
    case 'rejected':
      return 'Failed';
    default:
      return assertNever(status); // Compile error if case is missing
  }
}