How to achieve the intelligent code-completion from import file

[xgyyx]

monaco-editor version: 0.23.0
Browser: Chrome
OS: Mac

Hey, I'm trying to build an IDE like the pic below. The multi editor works fine.

But now I meet a problem is how to achieve the intelligent code-completion from import file.
As the example from playground,

monaco.languages.typescript.javascriptDefaults.addExtraLib

can do this job.
But when the file got an import as same as the namespace from extra lib, the completion was replaced just like this.

Is there any way that can keep using import from extra library and still get the completion?

[xgyyx]

Hope can get response from you guys, thx.