/**
 * Base64 + UTF-8 helpers for multimodal host-tool handlers (sandbox_llm,
 * take_screenshot). Promote to `utils/` when a third caller appears.
 */
/** Chunked to avoid blowing `String.fromCharCode.apply`'s argument stack on multi-MB inputs. */
export declare function bytesToBase64(bytes: Uint8Array): string;
export declare function bytesToUtf8(bytes: Uint8Array): string;
export declare function base64ToBytes(b64: string): Uint8Array;
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