postit-js-core/lib/features/snapping/PostitSnappingUtil.js

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import { getOrientation } from 'diagram-js/lib/layout/LayoutUtil';

export function getBoundaryAttachment(position, targetBounds) {

  var orientation = getOrientation(position, targetBounds, -15);

  if (orientation !== 'intersect') {
    return orientation;
  } else {
    return null;
  }
}