import { type SharedValue } from "react-native-reanimated";
/** Duration for chart reveal (loading/empty → live) and collapse (live → empty). */
export declare const CHART_REVEAL_DURATION_MS = 600;
/**
 * Maps a [0,1] morphT to a [0,1] opacity, starting at `delay` and reaching
 * 1 at morphT=1. Uses smoothstep for a polished ease-in/out.
 */
export declare function revealRamp(morphT: number, delay: number): number;
export interface ChartRevealState {
    /** 0 = loading/empty shell, 1 = fully live chart (matches web chartReveal). */
    morphT: SharedValue<number>;
    /** True while loading=true */
    isLoading: SharedValue<boolean>;
    /** True when not loading and no samples are available. */
    isEmpty: SharedValue<boolean>;
    yAxisOpacity: SharedValue<number>;
    fillOpacity: SharedValue<number>;
    lineOpacity: SharedValue<number>;
    dotOpacity: SharedValue<number>;
    badgeOpacity: SharedValue<number>;
}
/**
 * Drives loading / empty / live visibility.
 *
 * Chart is fully revealed only when `!loading && hasData`. Data appearing
 * grows `morphT` from 0 to 1; data disappearing snaps it to 0 so stale paths
 * never visibly flatten over a loading or empty shell. `isEmpty` is derived as
 * `!loading && !hasData` for the empty overlay label.
 */
export declare function useChartReveal(loading: boolean, hasData: SharedValue<boolean>, 
/** Static charts skip the entry ramp: morphT snaps to its target, no `withTiming`. */
isStatic?: boolean, 
/** Reveal/collapse duration (ms). Default {@link CHART_REVEAL_DURATION_MS}; `0` snaps. */
revealDuration?: number): ChartRevealState;
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