/** A single pointer sample recorded during a drag gesture. */
export interface VelocitySample {
    /** Drag offset in the dismiss direction (px) at sample time */
    offset: number;
    /** Timestamp in ms (Date.now()) */
    time: number;
}
/** Sliding window (ms) of samples used to compute release velocity. */
export declare const VELOCITY_WINDOW_MS = 100;
/**
 * Append a pointer sample, pruning entries that fall outside the sliding
 * window (plus a hard cap as a memory guard). Mutates and returns `samples`.
 */
export declare const appendVelocitySample: (samples: VelocitySample[], sample: VelocitySample) => VelocitySample[];
/**
 * Compute release velocity (px/ms, positive = dismiss direction) from the
 * samples recorded within the sliding window before `releaseTime`.
 *
 * Using only recent samples means a pause followed by a flick reports the
 * flick's velocity — not the whole-gesture average, which would dilute it
 * to near zero.
 */
export declare const getReleaseVelocity: (samples: VelocitySample[], releaseTime: number) => number;
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