vscode-extension-samples/statusbar-sample/.vscode/launch.json

// A launch configuration that compiles the extension and then opens it inside a new window
{
	"version": "0.2.0",
	"configurations": [
		{
			"name": "Launch Extension",
			"type": "extensionHost",
			"request": "launch",
			"runtimeExecutable": "${execPath}",
			"args": [
				"--extensionDevelopmentPath=${workspaceRoot}"
			],
			"stopOnEntry": false,
			"sourceMaps": true,
			"outFiles": [
				"${workspaceRoot}/out/**/*.js"
			],
			"preLaunchTask": "npm: watch"
		}
	]
}