backstage/.changeset/violet-jokes-tap.md

@backstage/frontend-plugin-api, @backstage/frontend-app-api

@backstage/frontend-plugin-api	@backstage/frontend-app-api
patch	patch

Added support for defining replaces in createExtensionInput which will allow extensions to redirect missing attachTo points to an input of the created extension.

export const AppThemeApi = ApiBlueprint.makeWithOverrides({
  name: 'app-theme',
  inputs: {
    themes: createExtensionInput([ThemeBlueprint.dataRefs.theme], {
      // attachTo: { id: 'app', input: 'themes'} will be redirected to this input instead
      replaces: [{ id: 'app', input: 'themes' }],
    }),
  },
  factory: () {
    ...
  }
});