Playground on site not catching invalid Javascript expressions error

Subject of the issue

Great Job on the v2 rc release! Noticed a minor bug with error catching on the new Playground page for the new Javascript expressions support.

Your environment

• OS: Window 10
• Packages: 2.0.0-rc.1 on https://v2.mdxjs.com/playground/
• Env: Chrome

Steps to reproduce

Invalid JSX Errors are caught correctly by the Compile tab:

Hello, world!
Below is an example of markdown in JSX.

</div>

Errors are NOT caught by the Compile tab when when using the new Javascript expressions syntax {…].

Hello, world!
Below is an example of markdown in JSX.

{r}

The page crashes from the error, error from chrome console:

Expected behaviour

Errors within Javascript expressions {…} should caught by the Playground Console tab like JSX syntax error.

Actual behaviour

The page crashes from the error, force you to refresh Playground.

[aquamarinecx]

This isn’t solved, editor doesn’t have a mechanism to catch invalid expressions. #1791 is related to codemirror state not being in sync with the application state

[wooorm]

ah, right, thanks!