fromJSON lost class information

[huan]

Thanks for your unit test; it's very helpful.

With your code, I am able to reproduce the bug, and it's related to the FileBox.fromJSON() method.

Here's the minimum reproducible code for FileBox:

test('message file test', async t => {
  const JSON_TEXT = '{"metadata":{},"name":"smoke-testing.ts","size":735,"type":7,"uuid":"82f461b9-e654-422d-aade-222d05cb02ad","boxType":7}'
  const FileBoxUuid = uuidifyFileBoxGrpc(() => ({} as any))
  const fileBoxUuid = FileBoxUuid.fromJSON(JSON_TEXT)
  t.equal(instanceToClass(fileBoxUuid, FileBox), FileBoxUuid, 'should get back FileBoxUuid class')
})

Originally posted by @huan in wechaty/puppet-service#206 (comment)

[huan]

Fixed by the commit.