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Tooltip and Popover Positioning Engine

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// @flow
import type { Placement } from '../enums';

const hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };

export default function getOppositePlacement(placement: Placement): Placement {
  return (placement.replace(
    /left|right|bottom|top/g,
    matched => hash[matched]
  ): any);
}