Clio Language Support for Visual Studio code adds syntax highlighting, code completion, suggestions and debugging features to VSCode. You can check the source here or check the package on VSCode marketplace.
You can install the Clio language server to get better code completion on VSCode. To enable the Clio language server, first you need to install it using npm:
npm i -g clio-language-server
Then, you need to head on to the Clio extension settings in VSCode and activate the feature: