/** JSON control-plane payloads; media bytes use the direct-upload transport. */
export declare const MAX_JSON_BODY_BYTES: number;
export declare class JsonBodyTooLargeError extends Error {
    constructor();
}
/** Count actual bytes, including requests without a trustworthy Content-Length.
 *  Structural parameter: DOM and Workers `Request` types both satisfy it. */
export declare function readJsonBody(request: {
    readonly body: ReadableStream<Uint8Array> | null;
}): Promise<unknown>;
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