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": [
        {
            "name": "C#: <project-name> Debug",
            "type": "dotnet",
            "request": "launch",
            "projectPath": "${workspaceFolder}/<relative-path-to-project-folder><project-name>.csproj"
        },
        {
            "command": "npm start",
            "name": "Run npm start",
            "request": "launch",
            "type": "node-terminal"
        },
        {
            "args": [
                "--extensionDevelopmentPath=${workspaceFolder}"
            ],
            "name": "Launch Extension",
            "outFiles": [
                "${workspaceFolder}/out/**/*.js"
            ],
            "preLaunchTask": "npm",
            "request": "launch",
            "type": "extensionHost"
        }

    ]
}