import type { Component } from "@earendil-works/pi-tui";
export interface AnimationViewportState {
    renderedRows?: number;
}
export declare const animationFitsViewport: (state: AnimationViewportState | undefined, terminalRows?: number) => boolean;
export declare const observeAnimationRows: (component: Component, state: AnimationViewportState) => Component;
export interface SpinnerTimerState extends AnimationViewportState {
    timer?: ReturnType<typeof setTimeout>;
    frame?: string;
}
export declare const spinnerFrame: (now?: number) => string;
export declare const updateSpinner: (state: SpinnerTimerState, active: boolean, invalidate: () => void, now?: number) => string;
//# sourceMappingURL=spinner.d.ts.map