---
title: extensionDidFinishLaunching()
framework: XcodeKit
role: symbol
role_heading: Instance Method
platforms: [macOS 10.12+]
path: xcodekit/xcsourceeditorextension/extensiondidfinishlaunching()
---

# extensionDidFinishLaunching()

Tells the extension that it successfully launched and may begin to receive editor commands.

## Declaration

```swift
optional func extensionDidFinishLaunching()
```

## Discussion

Discussion There are no guarantees about the thread or queue on which this method is called.