import { type Signal } from "@angular/core";
/**
 * Returns a signal that emits the previous value of the given signal.
 * The first time the signal is emitted, the previous value will be the same as the current value.
 *
 * @param s Signal to compute previous value for
 * @returns Signal that emits previous value of `s`
 */
export declare function computedPrevious<T>(s: Signal<T>): Signal<T>;
/**
 * Returns a signal that emits css styles form an element when it gets resized
 *
 * @param elem Element to compute styles for
 * @returns Signal that emits the calculated styles
 */
export declare function cssStyles<T>(elem: HTMLElement): Signal<CSSStyleDeclaration>;
/**
 * Returns a signal that emits css variables form an element when it gets resized
 *
 * @param elem Element to compute variables for
 * @returns Signal that emits the calculated properties
 */
export declare function cssVariables<T>(elem: HTMLElement): Signal<Record<string, string>>;