how to restrict drag elements to overlap in interact.js

Sorry that this was not answered sooner. I believe you have to manually check the position of the elements' top, bottom, left, and right edges, so here is what I did:
//Call this function from within your .on('dragmove') method.
//It should replace your translations.

function noOverlap(event, overlapElements){
    var dx = event.dx;
    var dy = event.dy;

    //just for flagging when the target would overlap another element
    var overlap = false;
    var targetDims = event.target.getBoundingClientRect();

    for(i = 0; i < overlapElements.length; i++){
        var overlapElementDims =  
        overlapElements[i].getBoundingClientRect();

        //make sure the element doesn't look at itself..
        if(overlapElements[i] != event.target){
            //checks if the target "doesn't" overlap
            if(((targetDims.right + dx) < (overlapElementDims.left + 1)) 
            ||((targetDims.left + 1 + dx) > (overlapElementDims.right)) 
            ||((targetDims.top + 1 + dy) > (overlapElementDims.bottom)) 
            ||((targetDims.bottom + dy) < (overlapElementDims.top + 1))){

            //Basically, the target element doesn't overlap the current 
            //element in the HTMLCollection, do nothing and go to the 
            //next iterate
            }
            else{
                //This is if the target element would overlap the current element

                //set overlap to true and break out of the for loop to conserve time.

                overlap = true;
                break;
            }
        }
    };

    if(overlap === false){

        //if there's no overlap, do your normal stuff, like:
        event.target.x += dx;
        event.target.y += dy;

        event.target.style.webkitTransform =
            event.target.style.transform =
                'translate(' + event.target.x + 'px, ' + event.target.y + 'px)';

        //then reset dx and dy
        dy = 0;
        dx = 0;
    }
    else{
        if(event.interaction.pointers[event.interaction.pointers.length - 1].type 
        === "pointerup"){

            //check if the target "is" in the restriction zone
            var restriction = 
            interact(event.target).options.drag.restrict.restriction;
            var restrictionDims = restriction.getBoundingClientRect();

            if((targetDims.right > restrictionDims.right) || 
            (targetDims.left < restrictionDims.left) || 
            (targetDims.bottom > restrictionDims.bottom) || 
            (targetDims.top < restrictionDims.top)){
                event.target.style.webkitTransform =
                event.target.style.transform =
                    'translate(0px, 0px)';

                //then reset dx and dy
                dy = 0;
                dx = 0;

                //then reset x and y
                event.target.x = 0;
                event.target.y = 0;
            }
        }       
    } 
}
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