/**
 * Pure helper for the space-aware classmate avatar group in StudentLessonCard.
 *
 * Given the measured width available to the avatar group, returns how many avatars
 * should be shown before collapsing the rest into a "+N" overflow badge. The return
 * value maps directly onto AvatarGroup's `max` prop (avatars shown before overflow;
 * the badge renders only when `total > max`).
 */
export interface ComputeVisibleAvatarCountArgs {
    /** Measured content width of the avatar wrapper, in px. `null`/`0` → fallback. */
    availableWidth: number | null;
    /** Total number of classmate avatars. */
    total: number;
    /** Avatar diameter in px. Avatar "sm" = 2rem = 32px. */
    avatarSize?: number;
    /** Negative overlap between consecutive avatars, in px. AvatarGroup default = 9. */
    overlap?: number;
    /** "+N" badge diameter in px. --avatar-md = 2.5rem = 40px. */
    badgeSize?: number;
    /** Count to return when width is unknown (initial render). */
    fallback?: number;
}
export declare function computeVisibleAvatarCount({ availableWidth, total, avatarSize, overlap, badgeSize, fallback, }: ComputeVisibleAvatarCountArgs): number;
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