launch.json

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "args": [
        "--extensionDevelopmentPath=${workspaceFolder}/vscode-extension"
      ],
      "name": "Client",
      "outFiles": [
        "${workspaceFolder}/vscode-extension/out/*.js",
        "${workspaceFolder}/vscode-extension/out/*.js.map"
      ],
      "preLaunchTask": "build",
      "request": "launch",
      "type": "extensionHost",
      "sourceMaps": true
    },
    {
      "type": "scala",
      "request": "attach",
      "name": "Server",
      "buildTarget": "lsp",
      "hostName": "localhost",
      "port": 5010
    },
    {
      "name": "Run Extension Tests",
      "type": "extensionHost",
      "request": "launch",
      "runtimeExecutable": "${execPath}",
      "args": [
        "--extensionDevelopmentPath=${workspaceFolder}/vscode-extension",
        "--extensionTestsPath=${workspaceFolder}/vscode-extension/out/test/suite/index",
        "--disable-extensions",
        "${workspaceFolder}/vscode-extension/fixture"
      ],
      "outFiles": ["${workspaceFolder}/vscode-extension/out/test/**/*.js"],
      // "preLaunchTask": "build",
      "sourceMaps": true
    }
  ]
}