This adds support for the GLSLX shader language to Visual Studio Code. Features include inline errors, type tooltips, go-to-definition, and symbol renaming. It's open source and is published as glslx-vscode on the Visual Studio Marketplace.
Installing extensions in Visual Studio Code is a little strange. Use Ctrl+P to bring up the in-app command line (Command+P on OS X), then type "ext install glslx-vscode" and press enter when it loads.