function detectOverflow()

in _/js/bootstrap.bundle.js [2640:2694]
50 lines of code
19 McCabe index (conditional complexity)

  function detectOverflow(state, options) {
    if (options === void 0) {
      options = {};
    }

    var _options = options,
        _options$placement = _options.placement,
        placement = _options$placement === void 0 ? state.placement : _options$placement,
        _options$strategy = _options.strategy,
        strategy = _options$strategy === void 0 ? state.strategy : _options$strategy,
        _options$boundary = _options.boundary,
        boundary = _options$boundary === void 0 ? clippingParents : _options$boundary,
        _options$rootBoundary = _options.rootBoundary,
        rootBoundary = _options$rootBoundary === void 0 ? viewport : _options$rootBoundary,
        _options$elementConte = _options.elementContext,
        elementContext = _options$elementConte === void 0 ? popper : _options$elementConte,
        _options$altBoundary = _options.altBoundary,
        altBoundary = _options$altBoundary === void 0 ? false : _options$altBoundary,
        _options$padding = _options.padding,
        padding = _options$padding === void 0 ? 0 : _options$padding;
    var paddingObject = mergePaddingObject(typeof padding !== 'number' ? padding : expandToHashMap(padding, basePlacements));
    var altContext = elementContext === popper ? reference : popper;
    var popperRect = state.rects.popper;
    var element = state.elements[altBoundary ? altContext : elementContext];
    var clippingClientRect = getClippingRect(isElement(element) ? element : element.contextElement || getDocumentElement(state.elements.popper), boundary, rootBoundary, strategy);
    var referenceClientRect = getBoundingClientRect(state.elements.reference);
    var popperOffsets = computeOffsets({
      reference: referenceClientRect,
      element: popperRect,
      strategy: 'absolute',
      placement: placement
    });
    var popperClientRect = rectToClientRect(Object.assign({}, popperRect, popperOffsets));
    var elementClientRect = elementContext === popper ? popperClientRect : referenceClientRect; // positive = overflowing the clipping rect
    // 0 or negative = within the clipping rect

    var overflowOffsets = {
      top: clippingClientRect.top - elementClientRect.top + paddingObject.top,
      bottom: elementClientRect.bottom - clippingClientRect.bottom + paddingObject.bottom,
      left: clippingClientRect.left - elementClientRect.left + paddingObject.left,
      right: elementClientRect.right - clippingClientRect.right + paddingObject.right
    };
    var offsetData = state.modifiersData.offset; // Offsets can be applied only to the popper element

    if (elementContext === popper && offsetData) {
      var offset = offsetData[placement];
      Object.keys(overflowOffsets).forEach(function (key) {
        var multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;
        var axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';
        overflowOffsets[key] += offset[axis] * multiply;
      });
    }

    return overflowOffsets;
  }