export declare const MOTION_MS: {
    readonly fast: 150;
    readonly base: 200;
    readonly enter: 200;
    readonly exit: 200;
};
export type MotionSpeed = keyof typeof MOTION_MS;
export type CubicBezier = readonly [number, number, number, number];
/** Pebble easing curves (mobile `pebble-spec.json` motion.easing); `in` is Pebble's `accelerate`. */
export declare const MOTION_BEZIER: {
    readonly standard: readonly [0.2, 0, 0, 1];
    readonly out: readonly [0.16, 1, 0.3, 1];
    readonly in: readonly [0.3, 0, 1, 1];
};
export type MotionCurve = keyof typeof MOTION_BEZIER;
export declare const cubicBezierCss: (curve: CubicBezier) => string;
export declare const MOTION_EASE: string;
export declare const MOTION_EASE_OUT: string;
export declare const MOTION_EASE_IN: string;
/** Periods for loops that are feedback, not transitions: skeleton pulse, spinner turn, progress sweep. */
export declare const MOTION_LOOP_MS: {
    readonly pulse: 700;
    readonly spin: 800;
    readonly sweep: 1200;
};
export declare const MOTION_PRESS_SCALE = 0.98;
/** A `transition` value for named properties only — `all` also animates layout and colour flips. */
export declare const transitionFor: (properties: readonly string[], speed?: MotionSpeed, curve?: MotionCurve) => string;
export declare const motionTransition: (speed?: MotionSpeed, curve?: MotionCurve) => {
    duration: number;
    ease: [number, number, number, number];
};