import { InputBag } from './input-bag.js';
import { QueryParameterBag as QueryParameterBagContract } from '@supercharge/contracts';
export declare class QueryParameterBag<Properties> extends InputBag<Properties> implements QueryParameterBagContract<Properties> {
    /**
     * Returns the query string created from all items in this query parameter bag,
     * without the leading question mark `?`.
     *
     * **Notice:** the returned querystring is encoded. Node.js automatically
     * encodes the querystring to ensure a valid URL. Some characters would
     * break the URL string otherwise. This way ensures the valid string.
     */
    toQuerystring(): string;
    /**
     * Returns the decoded querystring by running the result of `toQuerystring`
     * through `decodeURIComponent`. This method is useful to debug during
     * development. It’s recommended to use `toQuerystring` in production.
     */
    toQuerystringDecoded(): string;
}