/**
 * OpenTUI requires Bun's native FFI. Node/tsx cannot initialize the renderer.
 * Prefer re-exec under Bun when available; otherwise fall back with a clear hint.
 */
export declare function isBunRuntime(): boolean;
/** Resolve `bun` on PATH or local clai/bun bin dirs (cross-platform). */
export declare function findBunExecutable(): string | undefined;
/** Automatically install Bun into ~/.clai/bin if missing (cross-platform). */
export declare function autoInstallBun(): string | undefined;
export declare function openTuiRuntimeHint(): string;
/**
 * If we are not already under Bun, re-launch this process with Bun using the
 * given entry module (usually `import.meta.url` of index.ts) + original CLI
 * args, then exit with the child status. Returns false when re-exec is not
 * possible (caller should fall back / print the hint).
 *
 * Pass `entryPath` explicitly — under `tsx`/`npx`, `process.argv[1]` is the
 * loader, not clai's entry.
 */
export declare function reexecWithBunIfNeeded(entryPath: string): boolean;
export declare function isOpenTuiFfiError(error: unknown): boolean;