/**
 * Provides features for storing and retrieving URL query parameters.
 *
 * @remarks
 * The URL can be server-relative, and it can also be an empty or null string.
 * The query parameters must start with "?" to indicate the first query parameter and
 * use "&" for all subsequent parameters. The class also supports fragments.
 *
 * Edge case behavior:
 *
 * Empty value (www.example.com/?test=) stores key and empty value
 * No equals in queryParam (www.example.com/?test) stores key and undefined value
 * Empty queryParam (www.example.com/?&debug=on) stores undefined key and value
 * Query param with only equals (www.example.com/?=&debug=on stores empty string key and value
 *
 * @privateRemarks
 * The design of this class was that it could split the URL out into a data structure, and the user
 * could add items to the data structure (TBD), and then another (TBD) function would rebuild the URL.
 * This weird design would ensure that e.g. if no change was made to the data structure, then the
 * round trip wouldn't change the characters in the URL at all, which might be useful e.g. if we're
 * comparing URLs.
 *
 * @deprecated Use the URLSearchParams browser API instead.  The SharePoint Framework includes a
 * polyfill for older browsers.
 * @public
 */
export default class UrlQueryParameterCollection {
    private _queryParameterList;
    constructor(url: string);
    /**
     * Returns the value of the first matching query parameter or undefined if the key doesn't exist.
     *
     * @remarks
     * Examples:
     * ```
     * this._queryParameterList = [
     * {key: TEST, value: done},
     * {key: DEBUG, value: false},
     * {key: TEST, value: notdone}]
     *   getValue('TEST') ---> 'done'
     *   getValue('debug')  ---> 'false'
     *   getValue('lost')  ---> undefined
     * ```
     * @param param - the case insensitive key for the desired query parameter value.
     */
    getValue(param: string): string | undefined;
    /**
     * Returns the values of all of the matching query parameters or undefined if the key doesn't exist.
     *
     * @remarks
     * Examples:
     * ```
     * this._queryParameterList = [
     * {key: TEST, value: done},
     * {key: DEBUG, value: false},
     * {key: TEST, value: notdone}]
     *   getValues('TEST') ---> ['done', 'notdone']
     *   getValues('debug')  ---> ['false']
     *   getValues('lost')  ---> undefined
     * ```
     * @param param - the case insensitive key for the desired query parameter value.
     */
    getValues(param: string): (string | undefined)[] | undefined;
    private _getUrlQueryParameterArray;
}
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