import RequestInterface from './request.js';
import ResponseInterface from './response.js';
/**
 * This method will return true or false if a Request or Response has a
 * Content-Type header that matches the argument.
 *
 * For example, if the Content-Type header has the value: application/hal+json,
 * then the arguments will all return true:
 *
 * * application/hal+json
 * * application/json
 * * hal+json
 * * json
 * * application/*
 */
export declare function is(message: RequestInterface<any> | ResponseInterface<any>, type: string): boolean;
type Preferences = {
    [preference: string]: true | string;
};
/**
 * Parses a RFC7240 Prefer header.
 *
 * It's a naive parser as it assumes a fairly simple subset of
 * Prefer.
 *
 * TODO: Make this parse every possible variation.
 */
export declare function parsePrefer(header: string | null): Preferences;
/**
 * This function takes a multi-value comma-separated header and splits it
 * into multiple headers.
 *
 * TODO: In the future this function will respect comma's appearing within
 * quotes and ignore them. It doesn't right now.
 */
export declare function splitHeader(header: string): string[];
export {};