code: function flattenize(routes, prefix, parent) {
    const list = {}
  
    Object.keys(routes.local).forEach((method) => {
      const localName = prefix === '' ? '/' : `${prefix}/`
  
      if (!list[localName]) {
        list[localName] = {}
      }
      list[localName][method] = [].concat(
        parent.before,
        routes.before,
        routes.local[method],
        routes.after,
        parent.after
      )
    })
  
    Object.keys(routes.scoped).forEach((scope) => {
      const scoped = routes.scoped[scope]
      const listeners = flattenize(scoped, `${prefix}/${scope}`, {
        before: parent.before.concat(routes.before),
        after: routes.after.concat(parent.after),
      })
  
      Object.assign(list, listeners)
    })
  
    return list
  }
docs: Recursive flatten
  @private
  @param {RestRoutes} routes Routes object from `createRest()`
  @param {string} prefix Add prefix to each route path
  @param {RestRoutes} parent Parent routes