export = Negotiator;

declare class Negotiator {
    /**
     * The negotiator constructor receives a request object
     */
    constructor(req: { headers: Negotiator.Headers });

    /**
     * Returns the most preferred media type from the client.
     *
     * @param [availableMediaTypes] When provided, returns the most preferred media type
     * from a list of available media types.
     */
    mediaType(availableMediaTypes?: string[]): string | undefined;

    /**
     * Returns an array of preferred media types ordered by the client preference
     *
     * @param [availableMediaTypes] When provided, returns an array of preferred media
     * types ordered by priority from a list of available media types.
     */
    mediaTypes(availableMediaTypes?: string[]): string[];

    /**
     * Returns the most preferred language from the client.
     *
     * @param [availableLanguages] When provided, returns the most preferred language
     * from a list of available languages.
     */
    language(availableLanguages?: string[]): string | undefined;

    /**
     * Returns an array of preferred languages ordered by the client preference.
     *
     * @param [availableLanguages] When provided, returns an array of preferred languages
     * ordered by priority from a list of available languages.
     */
    languages(availableLanguages?: string[]): string[];

    /**
     * Returns the most preferred charset from the client.
     *
     * @param [availableCharsets] When provided, returns the most preferred charset
     * from a list of available charsets.
     */
    charset(availableCharsets?: string[]): string | undefined;

    /**
     * Returns an array of preferred charsets ordered by the client preference.
     *
     * @param [availableCharsets] When provided, returns an array of preferred charsets
     * ordered by priority from a list of available charsets.
     */
    charsets(availableCharsets?: string[]): string[];

    /**
     * Returns the most preferred encoding from the client.
     *
     * @param [availableEncodings] When provided, returns the most preferred encoding
     * from a list of available encodings.
     */
    encoding(availableEncodings?: string[]): string | undefined;

    /**
     * Returns an array of preferred encodings ordered by the client preference.
     *
     * @param [availableEncodings] When provided, returns an array of preferred encodings
     * ordered by priority from a list of available encodings.
     */
    encodings(availableEncodings?: string[]): string[];
}

declare namespace Negotiator {
    interface Headers {
        [key: string]: string | string[] | undefined;
    }
}