Can't run example codes

[Yaoaoaoao]

Hello,

I have some problems running the example codes.

I followed the steps in "Install and execute main app or provided examples", installed all dependencies and ran the app. The "brat-frontend-editor.js" was loaded by the browser. But I got an error:

Uncaught ReferenceError: BratFrontendEditor is not defined
    at window_onload ((index):415)
    at onload ((index):424)

I also tried the react example in the section "Import module in your current application". Another error showed up:

window.BratFrontendEditor is not a constructor

I'm still new to frontend development. Anyone saw this before and knows a solution?

Thanks.