backstage/.changeset/twenty-swans-matter.md

@backstage/core-app-api

@backstage/core-app-api
patch

The createApp function from @backstage/core-app-api has been deprecated, with two new options being provided as a replacement.

The first and most commonly used one is createApp from the new @backstage/app-defaults package, which behaves just like the existing createApp. In the future this method is likely to be expanded to add more APIs and other pieces into the default setup, for example the Utility APIs from @backstage/integration-react.

The other option that we now provide is to use createSpecializedApp from @backstage/core-app-api. This is a more low-level API where you need to provide a full set of options, including your own components, icons, defaultApis, and themes. The createSpecializedApp way of creating an app is particularly useful if you are not using @backstage/core-components or MUI, as it allows you to avoid those dependencies completely.