import * as i0 from "@angular/core";
/**
 * Material 3 press ripple for interactive cards.
 *
 * Angular port of the ComPsych DS ripple. Apply to a positioned,
 * `overflow: hidden` element. On primary pointer-down it spawns a circle at the
 * pointer that scales out to the farthest corner and fades; keyboard activation
 * (Enter/Space) spawns a centered ripple.
 *
 * The ripple nodes are created imperatively and animated with the Web Animations
 * API, and their colour is `currentColor` — so no global stylesheet is needed
 * and the ripple inherits the host's text colour (white on filled/image, dark on
 * outlined/gradient), matching the reference.
 */
export declare class RippleDirective {
    private readonly el;
    private readonly zone;
    /**
     * Imperative suppression — the card surface only ripples when `interactive`
     * and not `disabled`. Set by the host component. Defaults to off.
     */
    suppressed: boolean;
    private static readonly DURATION_MS;
    private layer;
    onPointerDown(event: PointerEvent): void;
    onKeyDown(event: KeyboardEvent): void;
    private ensureLayer;
    private spawn;
    static ɵfac: i0.ɵɵFactoryDeclaration<RippleDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<RippleDirective, "[compsychRipple]", never, {}, {}, never, never, true, never>;
}