interface Array<T> {
    /**
     * Returns the value of the first element in the array where predicate is true, and undefined
     * otherwise.
     * @param predicate find calls predicate once for each element of the array, in ascending
     * order, until it finds one where predicate returns true. If such an element is found, find
     * immediately returns that element value. Otherwise, find returns undefined.
     * @param thisArg If provided, it will be used as the this value for each invocation of
     * predicate. If it is not provided, undefined is used instead.
     */
    find<S extends T>(predicate: (value: T, index: number, obj: T[]) => value is S, thisArg?: any): S | undefined
    find(predicate: (value: T, index: number, obj: T[]) => unknown, thisArg?: any): T | undefined
}