export declare function isBun(): boolean;
/**
 * Returns true when the locally cached gravity binary is older than
 * the minimum version this CLI knows how to drive. Callers use this
 * to force-redownload before spawning the tunnel.
 */
export declare function validateGravityRequiresUpgrade(version: string): boolean;
/**
 * Validate that the host runtime is recent enough.
 *
 * Under Bun: requires `MIN_BUN_VERSION`. Under Node: requires
 * `MIN_NODE_VERSION` (Node 24+, where stable native TypeScript
 * stripping and `node:sqlite` land). Older runtimes exit immediately
 * with a descriptive error.
 */
export declare function validateRuntime(): void;
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