import type { Headers } from './types.js';
/**
 * Marks a response body to be written verbatim by transport adapters
 * (no JSON.stringify). Use for HTML, XML, CSV, plain text, or binary.
 */
export declare class RawResponseBody {
    readonly content: string | Uint8Array;
    readonly contentType: string | undefined;
    constructor(content: string | Uint8Array, contentType?: string);
}
export declare const isRawResponseBody: (value: unknown) => value is RawResponseBody;
export type SerializedResponseBody = {
    type: 'empty';
} | {
    type: 'raw';
    content: string | Uint8Array;
    contentType: string | undefined;
} | {
    type: 'json';
    value: unknown;
};
/**
 * Decide how a transport should write a response body.
 * `RawResponseBody` is always verbatim. A plain string / Uint8Array is verbatim
 * only when a non-JSON `content-type` header is already set — otherwise JSON.
 */
export declare const serializeResponseBody: (body: unknown, headers?: Headers) => SerializedResponseBody;
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