export type Edge = 'top' | 'bottom' | 'left' | 'right';
export type DirectionMode = 'all' | 'vertical' | 'horizontal' | Edge;
export declare function parseDirectionMode(tokens: Iterable<string>): DirectionMode;
export declare function defaultEdge(mode: DirectionMode): Edge;
export declare function detectEdge(event: MouseEvent, el: Element, mode: DirectionMode): Edge;
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