Swift + VS Code, Windows (WSL), Linux

 SourceKit-LSP Extension for Visual Studio Code

Swift + CLI, Linux

Swift + CLI, Windows

1.Install Node
$ sudo apt-get install npm

2.Download SourceKit-LSP

3.Build SourceKit-LSP

$ cd Editors/vscode
$ npm run createDevPackage
 
4.Install SourceKit-LSP VSCode Extension
  
$ code --install-extension out/sourcekit-lsp-vscode-dev.vsix
//or Install from VSIX