import { Buffer } from "node:buffer";
import { Readable } from "node:stream";
import { HttpResponse } from "./response.js";
import { SizeHint } from "./size-hint.js";
import { TO_HTTP_RESPONSE, type ToHttpResponse } from "./to-response.js";
/**
 * Represents the body of an HTTP message, allowing for handling of various body
 * types like streams, strings, buffers, and more.
 *
 * Provides utilities for creating a body instance and transforming it into an
 * HTTP response.
 */
export declare class Body implements ToHttpResponse {
    readonly sizeHint: SizeHint;
    readonly contentTypeHint: string | null;
    readonly readable: ReadableStream<Uint8Array>;
    /**
     * Creates a new {@link Body}.
     *
     * @throws {@link !Error} if the provided stream is not readable.
     */
    constructor(stream: ReadableStream<Uint8Array>, sizeHint?: SizeHint, contentTypeHint?: string);
    /**
     * Creates a new {@link Body} from a {@link BodyLike} value.
     */
    static from(body: BodyLike): Body;
    [TO_HTTP_RESPONSE](): HttpResponse;
}
/**
 * Represents any value that can be treated as a body payload in HTTP response
 * handling.
 *
 * This type is a union of various formats that a body can take, enabling
 * flexibility in providing content.
 *
 * - {@link Body}: An object that represents the body of a `Response`.
 * - `string`: A text-based representation of the body content.
 * - `Buffer`: A binary buffer containing the body data.
 * - `Uint8Array`: A byte array containing the body data in binary form.
 * - `Readable`: A Node.js Readable stream yielding Uint8Array chunks.
 * - `ReadableStream`: A web-standard ReadableStream.
 * - `null`: Represents an absent or empty body.
 *
 * String bodies will by default have a content-type of `text/plain`, while
 * byte-input like `Buffer` or `Readable` will default to
 * `application/octet-stream`.
 */
export type BodyLike = Body | string | Buffer | Uint8Array | Readable | ReadableStream<Uint8Array> | null;
export declare const isBodyLike: (value: unknown) => value is BodyLike;