/**
 * Generates a random UUID (version 4) to use as an idempotency key.
 *
 * Prefers the platform's native `crypto.randomUUID()` when available (Node 19+,
 * modern browsers, Deno, Bun) and falls back to a `Math.random()`-based
 * implementation for older runtimes.
 */
export declare function generateIdempotencyKey(): string;
/**
 * Returns the auto-generated idempotency-key header. The header name is fixed for the SDK,
 * so it lives here rather than being repeated at every endpoint call site.
 */
export declare function getIdempotencyHeaders(): Record<string, string>;