/**
 * The decoded-size ceiling for base64-in-JSON content transfers: 25 MiB,
 * Gmail's attachment maximum and the suite's de facto boundary for bytes that
 * must buffer whole into a JSON string. Drive's blob paths, Gmail's
 * attachment download, and Gmail's compose attachments (outbound bytes buffer
 * whole into the raw message the same way) enforce it via
 * `assertWithinDownloadCap`; Drive's Google-native export paths are exempt,
 * bounded instead by Google's own export cap (about 10 MB).
 */
export declare const MAX_DOWNLOAD_BYTES: number;
/** The ceiling rendered as prose, one spelling for error and schema text alike. */
export declare const MIB_LABEL = "25 MiB";
/**
 * Refuse a transfer over the suite ceiling. One construction site for every
 * cap error, so the prose cannot drift from the constant; the options object
 * keeps a swapped subject/action unrepresentable. `size` may be Google's
 * string-typed metadata size; a non-finite value passes (the caller re-checks
 * the bytes that actually arrive, which contains a malformed size to a wasted
 * transfer, never an oversize output). `deferral` cites a wing's tracking
 * issue where larger transfers are deferred.
 */
export declare function assertWithinDownloadCap(size: number | string | null | undefined, options: {
    subject: string;
    action: string;
    deferral?: `https://${string}`;
}): void;
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