How to use the rambda.merge function in rambda

export const model = classDecorator((
  Class,
  name = Class.name,
  options = {auto: false},
) => {
  if (is.obj(name)) {
    options = merge(options, name)
    name = Class.name
  }

  const {preProcessSnapshot, postProcessSnapshot} = Class
  // TS class property initializers and defaults from constructor
  const values = new Class()
  const {onSnapshot, onPatch, onAction} = values

  let props = extractTaggedProps(Class, PropsKey)
  props = pipe(
    rdMap(args => args[0]),
    convertValuesToMst,
  )(props)

  const propKeys = Object.keys(props)
  const viewKeys = Object.keys(extractTaggedProps(Class, ViewsKey))

Model = Model.preProcessSnapshot(snapshot => {
    snapshot = preProcessSnapshot ? preProcessSnapshot(snapshot) : snapshot
    if (!is.obj(snapshot)) {
      if (!options.auto) return snapshot
      snapshot = {}
    }
    return merge(values, snapshot)
  })