Bug report

Describe the bug

when modifying the mobx state data, the latest data is not rendered

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. git clone https://github.com/Fullsize/next.js
2. yarn install
3. yarn dev
4. open the browser and enter localhost:3000
5. open user.store.ts to modify userName and view

BuidlerError and BuidlerPluginError instances aren't print nicely in node's console. We should provide custom inspect methods to change this.

Currently the eldoc type is either function or variable:

(defn- extract-eldoc
  [info]
  (if-let [arglists (seq (-> info extract-arglists format-arglists))]
    {:eldoc arglists :type "function"}
    {:type "variable"}))

This means that the result users see is not particularly accurate, not to mention that the function check is pretty primitive. We should add types like `m