/**
 * This function should never be called. If it is called, it means that the
 * code has reached a point that should be unreachable.
 *
 * @example
 * ```ts
 * function f(val: 'a' | 'b') {
 *  if (val === 'a') {
 *   return 1;
 * } else if (val === 'b') {
 *  return 2;
 * }
 * unreachable(val);
 * ```
 */
export declare function unreachable(val: never, message?: string): never;
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