feat(events): add default exports for new backend system

Add default exports for event modules
to be used with the new backend system
as well as documentation on how to install.

Signed-off-by: Patrick Jungermann <Patrick.Jungermann@gmail.com>

.changeset/odd-ligers-return.md

@@ -0,0 +1,7 @@
+---
+'@backstage/plugin-events-backend-module-bitbucket-cloud': patch
+'@backstage/plugin-events-backend-module-gerrit': patch
+'@backstage/plugin-events-backend-module-azure': patch
+---
+
+Add default exports for the new backend system and documentation.

plugins/events-backend-module-azure/README.md

@@ -31,6 +31,14 @@ Install this module:
 yarn add --cwd packages/backend @backstage/plugin-events-backend-module-azure
 ```
 
+### Add to backend
+
+```ts title="packages/backend/src/index.ts"
+backend.add(import('@backstage/plugin-events-backend-module-azure/alpha'));
+```
+
+### Add to backend (old)
+
 Add the event router to the `EventsBackend` instance in `packages/backend/src/plugins/events.ts`:
 
 ```diff

plugins/events-backend-module-azure/api-report-alpha.md

@@ -6,7 +6,9 @@
 import { BackendFeature } from '@backstage/backend-plugin-api';
 
 // @alpha
-export const eventsModuleAzureDevOpsEventRouter: () => BackendFeature;
+const eventsModuleAzureDevOpsEventRouter: () => BackendFeature;
+export default eventsModuleAzureDevOpsEventRouter;
+export { eventsModuleAzureDevOpsEventRouter };
 
 // (No @packageDocumentation comment for this package)
 ```

plugins/events-backend-module-azure/src/alpha.ts

@@ -15,3 +15,4 @@
  */
 
 export { eventsModuleAzureDevOpsEventRouter } from './service/eventsModuleAzureDevOpsEventRouter';
+export { eventsModuleAzureDevOpsEventRouter as default } from './service/eventsModuleAzureDevOpsEventRouter';

plugins/events-backend-module-bitbucket-cloud/README.md

@@ -31,6 +31,16 @@ Install this module:
 yarn add --cwd packages/backend @backstage/plugin-events-backend-module-bitbucket-cloud
 ```
 
+### Add to backend
+
+```ts title="packages/backend/src/index.ts"
+backend.add(
+  import('@backstage/plugin-events-backend-module-bitbucket-cloud/alpha'),
+);
+```
+
+### Add to backend (old)
+
 Add the event router to the `EventsBackend` instance in `packages/backend/src/plugins/events.ts`:
 
 ```diff

plugins/events-backend-module-bitbucket-cloud/api-report-alpha.md

@@ -6,7 +6,9 @@
 import { BackendFeature } from '@backstage/backend-plugin-api';
 
 // @alpha
-export const eventsModuleBitbucketCloudEventRouter: () => BackendFeature;
+const eventsModuleBitbucketCloudEventRouter: () => BackendFeature;
+export default eventsModuleBitbucketCloudEventRouter;
+export { eventsModuleBitbucketCloudEventRouter };
 
 // (No @packageDocumentation comment for this package)
 ```

plugins/events-backend-module-bitbucket-cloud/src/alpha.ts

@@ -15,3 +15,4 @@
  */
 
 export { eventsModuleBitbucketCloudEventRouter } from './service/eventsModuleBitbucketCloudEventRouter';
+export { eventsModuleBitbucketCloudEventRouter as default } from './service/eventsModuleBitbucketCloudEventRouter';

plugins/events-backend-module-gerrit/README.md

@@ -30,6 +30,14 @@ Install this module:
 yarn add --cwd packages/backend @backstage/plugin-events-backend-module-gerrit
 ```
 
+### Add to backend
+
+```ts title="packages/backend/src/index.ts"
+backend.add(import('@backstage/plugin-events-backend-module-gerrit/alpha'));
+```
+
+### Add to backend (old)
+
 Add the event router to the `EventsBackend` instance in `packages/backend/src/plugins/events.ts`:
 
 ```diff

plugins/events-backend-module-gerrit/api-report-alpha.md

@@ -6,7 +6,9 @@
 import { BackendFeature } from '@backstage/backend-plugin-api';
 
 // @alpha
-export const eventsModuleGerritEventRouter: () => BackendFeature;
+const eventsModuleGerritEventRouter: () => BackendFeature;
+export default eventsModuleGerritEventRouter;
+export { eventsModuleGerritEventRouter };
 
 // (No @packageDocumentation comment for this package)
 ```

plugins/events-backend-module-gerrit/src/alpha.ts

@@ -15,3 +15,4 @@
  */
 
 export { eventsModuleGerritEventRouter } from './service/eventsModuleGerritEventRouter';
+export { eventsModuleGerritEventRouter as default } from './service/eventsModuleGerritEventRouter';