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": [
        {
            "type": "lldb",
            "request": "launch",
            "name": "Debug buck2",
            "cargo": {
                "args": [
                    "build",
                    "--bin=buck2",
                    "--package=cli"
                ],
                "env": {
                    // Doesn't work, but has been requested upstream
                    // https://github.com/vadimcn/vscode-lldb/issues/388
                    "CARGO_PROFILE_DEV_DEBUG": "true"
                },
                "filter": {
                    "name": "buck2",
                    "kind": "bin"
                }
            },
            "args": [
                "build",
                "fbcode//buck2:buck2"
            ],
            "cwd": "${workspaceFolder}"
        },
        {
            "type": "lldb",
            "request": "attach",
            "name": "Debug buck2d",
            "cwd": "${workspaceFolder}",
            "pid": "${command:pickMyProcess}",
        },
        {
            "type": "starlark",
            "request": "launch",
            "name": "Starlark",
            "program": "${file}"
        }
    ]
}