Learn about changes to the macOS SDK.
The Apple Developer Program provides everything you need to build and distribute your apps on the Mac App Store. Membership includes access to beta OS releases, advanced app capabilities, and tools to develop, test, and distribute apps and Safari extensions. For more information, visit Apple Developer Program.
For issues not mentioned in release notes, file bugs through Apple Bug Reporter.
When filing a bug, please include the full version number in the bug title and in the description. This looks like “10.14 (18Axxxx).” You can find the full version number by choosing About This Mac from the Apple Menu. In the window that appears, click on “Version 10.14” displayed beneath “macOS” to show the full version including the part that is in parentheses.