BUG: Cocos Creator 2.3.0 typescript source mapping is broken.

Hello,

I have upgraded yesterday, and I’ve got problems in using typescript with Cocos Creator 2.3.0.
The definition file(creator.d.ts) generated by the creator has many syntax errors.
But, I can fix it manually, so it is not so big problem.

The main problem is Chrome debugging breakpoint is not working while debugging with Visual Studio Code.
I guess the source mapping is broken in preview mode.
Is there any suggestion can I fix this?
Please, help me.

Thank you.

We can ask @jare to help with this.