const removeKey = (key, {[key]: _, ...rest}) => rest;

const getNewObj = toAdd => Array.isArray(toAdd) ? getObj(toAdd) : toAdd

const DE_DUPE = (e, i, arr) => arr.indexOf(e) === i

const removeEmptyObj = (o) => {
  let ignores = [null, undefined, ""],
  isNonEmpty = d => !ignores.includes(d) && (typeof(d) !== "object" || Object.keys(d).length)
  return JSON.parse(JSON.stringify(o), function(k, v) {
    if (isNonEmpty(v))
      return v;
  });
}
const getDeepMerge = (ogObj, opts={})=> {
  const { add, uniq=true, replace=false, removeEmpty=false } = opts

  const isObject = obj => obj && typeof obj === 'object';
    return [ogObj, add].reduce((prev, obj) => {
      let _add = {...prev}
      Object.keys(obj).forEach(key => {

        const pVal = _add[key];
        const oVal = obj[key];

        if (Array.isArray(pVal) && Array.isArray(oVal)) {
          _add[key] = pVal.concat(...oVal).filter(uniq ? DE_DUPE : null)
          if(replace){
_add[key] = oVal }
          _add = removeEmpty ? removeKey(key, _add) : _add

        }
        else if (isObject(pVal) && isObject(oVal)) {
            _add[key] = getDeepMerge(pVal, {...opts, add:oVal})
            if(replace){
              _add[key] = oVal
            }
        }
        else {
          _add[key] = oVal
        }
      });
      return removeEmptyObj(_add)
    }, {});
}
```