/**
 * Filters the given array, removing all elements that do not match the given predicate
 * **in place. This means `array` will be modified!**.
 */
export declare function filterInPlace<T>(array: Array<T>, predicate: (el: T) => boolean): Array<T>;
/**
 * Produces a random number between the inclusive `lower` and `upper` bounds.
 */
export declare function randomInteger(lower: number, upper: number): number;