interface JQueryAtWhoOptions<T> {
    // key char for observing such as `@`
    at?: string;
    /*
        alias name of `at`
        it would be an id attribute of the popup view.
    */
    alias?: string;
    /*
         should be a plain object *Array* or a *URL*
         would save *Array* directly.
         would load and save remote JSON data by *URL*
     */
    data?: T[];
    /*
         would eval it and assign value of the key contained in `${}`
         key-value ( {'name'?: "one"} ) is an item in `data` Array.
         Alternatively, this can be a function accepting one data item as a parameter.
    */
    displayTpl?: string | ((T)=> string);
    /*
         It will be evaluated and inserted in the inputor.
         `atwho-at` is the `at` for runtime by default.
         You change it into anything you want.
    */
    insertTpl?: string;
    /*
        There are several data processors that can be overriden here such as `filter`.
        we will cover it later.
    */
    callbacks?: any,
    /*
        would matching item by test against the value of this `search_key` with query string.
    */
    searchKey?: string;
    /*
        limit number of items to show in popup list.
    */
    limit?: number;
    /*
        setting the max length of the string after `at` that would be matched
        It will stop matching if the query string is longer than `max_len`.
    */
    maxLen?: number;
    /*
        if `yes`, At.js will match the query with a spaaace before the `at`.
    */
    startWithSpace?: boolean,
    displayTimeout?: number;
    // highlight_first suggestion in popup menu
    highlightFirst?: boolean,
    // delay time trigger At.js while typing. For example?: delay?: 400
    delay?: number,
    // suffix for inserting string.
    suffix?: string;
    // don't show dropdown view without `suffix`
    hideWithoutSuffix?: boolean;
}

interface JQueryAtWhoStatic {

}

interface JQueryStatic {
    atwho: JQueryAtWhoStatic;
}

interface JQuery {
    atwho(method: "hide"): JQuery;
    atwho(method: "destroy"): JQuery;
    atwho(method: "run"): JQuery;
    atwho(method: string): JQuery;
    atwho<T>(options?: JQueryAtWhoOptions<T>): JQuery;
}