declare global {
    interface Array<T> {
        /**
         * Returns the first element of a the array, or the first element that satisfies the condition (by predicateFunc), or <c>defaultValue</c> if no element is found.
         * @param predicateFunc A optional function to test each element for a condition. If function is not specified, the first element is returend or <c>defaultValue</c>.
         * @param defaultValue A default value that will be returned if the element is not found. If this parameter is not specified, null is returned.
         * @example items.FirstOrDefault((item) => item.name === "SPFx-App.dev";);
         * @returns <c>null|defaultValue</c> if <c>Array<T></c> is empty or if no element passes the test specified by predicate; otherwise, the first element in source <c>Array<T></c> that passes the test specified by predicate.
         * @since 1.0.0
         * @since 1.1.0 predicateFunc is optional, if not set the first element or <c>null|defaultValue</c> is returned
         */
        FirstOrDefault(predicateFunc?: (item: T) => boolean, defaultValue?: T | null): T | null;
        /**
         * Returns the first index of element of a sequence, or <c>-1</c> if no element is found.
         * @param predicateFunc A function to get the index for a condition.
         * @example items.IndexOf((item) => { return item.name === "SPFx-App.dev"; });
         * @returns <c>null</c> if <c>Array<T></c> is empty or if no element passes the test specified by predicate; otherwise, the first element in source <c>Array<T></c> that passes the test specified by predicate.
         * @since 1.0.0
         */
        IndexOf(predicateFunc: (item: T) => boolean): number;
        /**
         * Filters a sequence of values based on a predicate.
         * @param predicateFunc A function to test each element for a condition.
         * @example items.Where((item) => { return item.Active === true; });
         * @returns An <c>Array<T></c> that contains elements from the input sequence that satisfy the condition.
         * @since 1.0.0
         */
        Where(predicateFunc: (item: T) => boolean): Array<T>;
        /**
         * Sorts the elements of a sequence in ascending order.
         * @param keySelector A function to extract a key from an element.
         * @example items.OrderBy((item) => item.name);
         * @returns An <c>Array<T></c> whose elements are sorted according to a key.
         * @since 1.0.0
         */
        OrderBy(keySelector: (item: T) => any): Array<T>;
        /**
         * Sorts the elements of a sequence in descending order.
         * @param keySelector A function to extract a key from an element.
         * @example items.OrderByDescending((item) => item.name);
         * @returns An <c>Array<T></c> whose elements are sorted descending to a key.
         * @since 1.0.0
         */
        OrderByDescending(keySelector: (item: T) => any): Array<T>;
        /**
         * Sorts the elements of a sequence in ascending order (first by a then by b then by c etc.).
         * @param keySelectors An array of functions to extract a key from an element.
         * @example items.OrderByMultiple([(item) => item.name, (item) => item.id]);
         * @returns An <c>Array<T></c> whose elements are sorted ascending to multiple keys.
         * @since 1.0.0
         */
        OrderByMultiple(keySelectors: Array<(item: T) => any>): Array<T>;
        /**
         * Sorts the elements of a sequence in descending order (first by a then by b then by c etc.).
         * @param keySelectors An array of functions to extract a key from an element.
         * @example items.OrderByMultipleDescending([(item) => item.name, (item) => item.id]);
         * @returns An <c>Array<T></c> whose elements are sorted descending to multiple keys.
         * @since 1.0.0
         */
        OrderByMultipleDescending(keySelectors: Array<(item: T) => any>): Array<T>;
        /**
         * Determines whether an array contains a particular element that satisfies the condition
         * @param predicateFunc A function to test each element for a condition.
         * @returns <c>true</c> if the Array contains the element, otherwise <c>false</c>
         * @since 1.1.0
         */
        Contains(predicateFunc: (item: T) => boolean): boolean;
        /**
         * Returns the number of elements that satisfies the condition
         * @param predicateFunc A function to test each element for a condition.
         * @returns The number of elements
         * @since 1.1.0
         */
        Count(predicateFunc: (item: T) => boolean): number;
        /**
         * Returns the last element of a the array, or the last element that satisfies the condition (by predicateFunc), or <c>defaultValue</c> if no element is found.
         * @param predicateFunc A optional function to test each element for a condition. If function is not specified, the last element is returend or <c>defaultValue</c>.
         * @param defaultValue A default value that will be returned if the element is not found. If this parameter is not specified, null is returned.
         * @returns <c>defaultValue</c> if no element is found, otherwise the last element last element of a the array, or the last element that satisfies the condition (by predicateFunc)
         * @since 1.1.0
         */
        LastOrDefault(predicateFunc?: (item: T) => boolean, defaultValue?: T | null): T | null;
        /**
         * Add one or more items at specified index
         * @param index The index at which to add the new item(s). If greater than the length of the array or negative, the item(s) are added at the end.
         * @param itemToAdd One or more elements to add to the array
         * @since 1.1.0
         */
        AddAt(index: number, ...itemToAdd: any[]): void;
        /**
        * Remove the item(s) at specified index
        * @param index The index at which to remove the item(s)
        * @param totalItemsToRemove Number of elements to be removed from the specified index. Default: 1
        * @since 1.1.0
        */
        RemoveAt(index: number, totalItemsToRemove?: number): void;
    }
}
export {};
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