To fix this we need to update mongosh to version 1.18+ and then it will be fixed.

Here's the original description:

Looks like something when we run playgrounds something is looking for browserlists in the open workspace. To reproduce you can open a node js project folder/workspace and edit the package.json and add something like:

  "browserslist": [
    "Node 14.18"
  ],

Or add a .browserslistrc file with similar.
The error then occurs when trying to run a playground.

Reported on github: https://github.com/mongodb-js/vscode/issues/375