vscode-extension-samples/lsp-multi-root-sample/.vscode/launch.json

{
	"version": "0.2.0",
	// List of configurations. Add new configurations or edit existing ones.
	"configurations": [
		{
			"name": "Launch Client",
			"type": "extensionHost",
			"request": "launch",
			"runtimeExecutable": "${execPath}",
			"args": ["--extensionDevelopmentPath=${workspaceRoot}/client" ],
			"stopOnEntry": false,
			"sourceMaps": true,
			"outFiles": [ "${workspaceRoot}/client/out/src/**/*.js" ],
			"preLaunchTask": "watch:client"
		},
		{
			"name": "Attach to Server",
			"type": "node",
			"request": "attach",
			"port": 6009,
			"sourceMaps": true,
			"outFiles": [ "${workspaceRoot}/client/server/**/*.js" ],
			"preLaunchTask": "watch:server"
		}
	]
}