/**
 * This interface represents a set of HTTP headers.
 */
export interface HeadersInterface {
    /**
     * Sets a HTTP header name and value
     */
    set(name: string, value: string | string[] | number): void;
    /**
     * Gets a HTTP header's value.
     *
     * This function will return null if the header did not exist. If it did
     * exist, it will return a string.
     *
     * If there were multiple headers with the same value, it will join the
     * headers with a comma.
     */
    get(name: string): string | null;
    /**
     * Gets all values of a HTTP header
     *
     * This function will return an array with 0 or more values of a header.
     *
     */
    getMany(name: string): string[];
    /**
     * Returns true or false depending on if a HTTP header exists.
     */
    has(name: string): boolean;
    /**
     * Removes a HTTP header
     */
    delete(name: string): void;
    /**
     * Returns all HTTP headers.
     *
     * Headernames are lowercased. Values may be either strings or arrays of
     * strings or numbers.
     */
    getAll(): HeadersObject;
    /**
     * Appends a new header, without removing an old one with the same name.
     */
    append(name: string, value: string | string[] | number): void;
}
/**
 * This type is a simple key-value object that can be used to instantiate a
 * Headers class.
 */
export type HeadersObject = {
    [headerName: string]: string | string[] | number;
};
export declare class Headers implements HeadersInterface {
    private store;
    constructor(headersObj?: HeadersObject);
    /**
     * Sets a HTTP header name and value.
     */
    set(name: string, value: string | string[] | number): void;
    /**
     * Gets a HTTP header's value.
     *
     * This function will return null if the header did not exist. If it did
     * exist, it will return a string.
     *
     * If there were multiple headers with the same value, it will join the
     * headers with a comma.
     */
    get(name: string): string | null;
    /**
     * Gets all values of a HTTP header
     *
     * This function will return an array with 0 or more values of a header.
     *
     */
    getMany(name: string): string[];
    /**
     * Returns true or false depending on if a HTTP header exists.
     */
    has(name: string): boolean;
    /**
     * Returns all HTTP headers.
     *
     * Headernames are lowercased. Values may be either strings or arrays of
     * strings or numbers.
     */
    getAll(): HeadersObject;
    /**
     * Appends a new header, without removing an old one with the same name.
     */
    append(name: string, value: string | string[] | number): void;
    /**
     * Removes a HTTP header
     */
    delete(name: string): void;
}
export default Headers;