import type { MotionEasing } from './types';
export declare const DEFAULT_CUSTOM_EASING = "cubic-bezier(0.22, 1, 0.36, 1)";
export declare const MOTION_EASING_PRESETS: {
    readonly smooth: "cubic-bezier(0.22, 1, 0.36, 1)";
    readonly linear: "linear";
    readonly easeIn: "cubic-bezier(0.32, 0, 0.67, 0)";
    readonly easeOut: "cubic-bezier(0.33, 1, 0.68, 1)";
    readonly easeInOut: "cubic-bezier(0.65, 0, 0.35, 1)";
};
export declare const MOTION_EASING_OPTIONS: readonly MotionEasing[];
export declare const CUSTOM_EASING_WARNING = "Custom easing is invalid; falling back to smooth.";
export type CustomEasingValidation = {
    ok: true;
    value: string;
} | {
    ok: false;
    reason: string;
};
export declare function validateCustomEasing(value: unknown): CustomEasingValidation;
export declare function createMotionEasingFields(easing: MotionEasing, customEasing?: string): {
    easing: MotionEasing;
    customEasing?: string;
};
export declare function resolveMotionEasing(action: {
    easing?: MotionEasing;
    customEasing?: string;
}): {
    easing: string;
    warnings: never[];
} | {
    easing: "cubic-bezier(0.22, 1, 0.36, 1)";
    warnings: string[];
};