/**
 * Exhaustiveness check for discriminated union switches.
 * Place in the `default` branch of a switch over a union type
 * to get a compile-time error when a new variant is added.
 *
 * @example
 * switch (block.type) {
 *   case 'text': return renderText(block);
 *   case 'tool_use': return renderToolUse(block);
 *   default: return assertNever(block);
 * }
 */
export declare function assertNever(x: never, message?: string): never;
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