Install the extension and you should see invalid imports highlighted as errors on save.
Navigate to the settings for the extension in Extensions > Tach to set arguments if needed.
Run Tach: Restart Server from the command palette (CMD+SHFT+P) to restart the server.
If you run into any issues, let us know by submitting a Github Issue!
Known Issues
To diagnose an issue, use 'Output: Focus on Output View' in the VSCode Command Palette, and then select 'Tach' from the dropdown selector to see the logs.
'Project config root not found': this means you don't have a tach.toml in the ancestors of an open file. This should generally be in the root of your repo.