/** Base URL the engine assets are fetched from (`ZRT_ENGINE_CDN`, else the default CDN). */
export declare function engineCdnBase(): string;
/** Full URL of the `.tar.gz` engine asset for a version + target. */
export declare function engineAssetUrl(version: string, target: string): string;
/** Download the target's `.tar.gz`, verify its checksum when present, and install the binary to `destBinaryPath`. */
export declare function downloadEngine(version: string, destBinaryPath: string): Promise<void>;