export interface QuickBarPositionArgs {
    readonly anchorRect: {
        top: number;
        bottom: number;
        left: number;
        right: number;
    };
    readonly barHeight: number;
    /** Top edge of the visible viewport, in the SAME coordinate frame as
     *  anchorRect — pass 0 when anchorRect is already viewport-relative
     *  (position:fixed / shadow-host mount) or when the containing block
     *  doesn't scroll independently (position:absolute inside a
     *  non-scrolling wrapper — ReactionQuickBar's #container case). */
    readonly viewportTop: number;
    readonly isOwn: boolean;
    readonly gap?: number;
}
export interface QuickBarPosition {
    readonly top: number;
    readonly placement: 'above' | 'below';
    /** Set for a non-own message (anchor by left edge). Undefined when `right` is set. */
    readonly left?: number;
    /** Set for an own message (anchor by right edge, bar hugs the bubble's right side). Undefined when `left` is set. */
    readonly right?: number;
}
export declare function computeQuickBarPosition(args: QuickBarPositionArgs): QuickBarPosition;
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