TypeScript syntax highlithing and twoslash autocompletion does not work in mdx files

[vecerek]

Given the mdx vscode extension and the Twoslash VS code extension are both installed, these two files, and a docusaurus 2.0 setup with mdx:

repro.md

```ts twoslash
// ---cut---
const hi = "Hi" as const;
```

repro.mdx

import Tabs from "@theme/Tabs";
import TabItem from "@theme/TabItem";

<Tabs>
<TabItem value="val" label="Label">

```ts twoslash
// ---cut---
const hi = "Hi" as const;
```

</TabItem>
</Tabs>

I would expect the TypeScript code to be highlighted the same way in both files. Instead, I see this:

Can you also reproduce this behavior, or is it just something with my local setup? 😅 Would you expect the twoslahs plug to work for both MD and MDX files?

[orta]

I've never worked with mdx, so I didn't add support - you're welcome to add support though!