- Run the [`Launch Extension`](https://github.com/microsoft/vscode/blob/master/extensions/css-language-features/.vscode/launch.json) debug target in the Debug View. This will:
If you want to fix CSS/SCSS/Less issues or make improvements, you should make changes at [microsoft/vscode-css-languageservice](https://github.com/microsoft/vscode-css-languageservice).
However, within this extension, you can run a development version of `vscode-css-languageservice` to debug code or test language features interactively:
#### Linking `vscode-css-languageservice` in `css-language-features/server/`
#### Testing the development version of `vscode-css-languageservice`
- Open both `vscode-css-languageservice` and this extension in a single workspace with [multi-root workspace](https://code.visualstudio.com/docs/editor/multi-root-workspaces) feature
- Make some changes in `vscode-css-languageservice`
- Now when you run `Launch Extension` debug target, the launched instance will use your development version of `vscode-css-languageservice`. You can interactively test the language features.
- You can also run the `Debug Extension and Language Server` debug target, which will launch the extension and attach the debugger to the language server. After successful attach, you should be able to hit breakpoints in both `vscode-css-languageservice` and `css-language-features/server/`