/**
 * Returns the attachment bytes base64url-encoded, as Gmail returns them, or
 * writes them to disk and returns the path when `savePath` is set (avoiding a
 * large base64 payload in the response).
 */
export declare const download_attachment: import("../../../lib/operation.js").Operation<import("@googleapis/gmail").gmail_v1.Gmail, import("zod").ZodObject<{
    messageId: import("zod").ZodString;
    attachmentId: import("zod").ZodString;
    savePath: import("zod").ZodOptional<import("zod").ZodString>;
}, import("zod/v4/core").$strict>, import("zod").ZodObject<{
    attachmentId: import("zod").ZodString;
    size: import("zod").ZodNumber;
    data: import("zod").ZodOptional<import("zod").ZodString>;
    path: import("zod").ZodOptional<import("zod").ZodString>;
}, import("zod/v4/core").$strip>>;
//# sourceMappingURL=index.d.ts.map