import type { HTTPMethod } from './link.js';
/**
 * Conditionally get body to avoid issues with
 * "TypeError: Response body object should not be disturbed or locked"
 * "TypeError: Request with GET/HEAD method cannot have body."
 * @see https://share.cleanshot.com/KPYHPC5n
 * Typically used together with modifyRequest
 */
export declare function maybeGetBody(req: Request): Promise<Blob | null>;
type URLOverrides = {
    /** Either overrides or fn that does in-place modification */
    searchParams?: Record<string, unknown> | ((sp: URLSearchParams) => void);
} & Partial<Pick<URL, 'hash' | 'hostname' | 'href' | 'password' | 'pathname' | 'port' | 'protocol' | 'username'>>;
export declare function modifyUrl(urlStr: string, { searchParams, ...overrides }: URLOverrides): string;
export declare function modifyRequest(req: Request, overrides: Omit<RequestInit, 'headers'> & {
    method?: HTTPMethod;
    url?: string | URLOverrides;
    /** Either overrides or fn that does in-place modification */
    headers?: HeadersInit | ((headers: Headers) => void);
    /**
     * Needed when passing through body as ReadableStream of byteArray. Solves
     * "TypeError: RequestInit: duplex option is required when sending a body."
     * TODO: Think about if we should better abstract this somehow...
     */
    duplex?: 'half';
}): Request;
export declare function modifyResponse(res: Response, overrides: Omit<ResponseInit, 'headers'> & {
    headers?: HeadersInit | ((headers: Headers) => void);
}): Response;
export declare function modifyHeaders(original: HeadersInit, modify: HeadersInit | ((headers: Headers) => void) | undefined): Headers;
/** Courtesy of https://github.com/whitecrownclown/merge-headers/blob/master/index.ts */
export declare function mergeHeaders(...sources: Array<HeadersInit | undefined>): Headers;
export {};
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