code: function contains (obj1, obj2) {
    const keys = Object.keys(obj1)
    let result = keys.length > 0
    let l = keys.length
    while (l--) {
      const key = keys[l]
      result = result && match(obj1[key], obj2[key])
    }
    return result
  }
docs: Return true if second object contains all keys and values
  from the first object.
  
  @param {Object} obj1
  @param {Object} obj2
  @return {Boolean}
  @api private