Merge pull request #20723 from backstage/rugvip/remove-exp-types

cli: remove support for --experimental-type-build

.changeset/chilly-books-sneeze.md

@@ -0,0 +1,6 @@
+---
+'@backstage/cli-node': minor
+'@backstage/cli': minor
+---
+
+Removed support for the `publishConfig.alphaTypes` and `.betaTypes` fields that were used together with `--experimental-type-build` to generate `/alpha` and `/beta` entry points. Use the `exports` field to achieve this instead.

.changeset/many-masks-smoke.md

@@ -0,0 +1,6 @@
+---
+'@backstage/repo-tools': minor
+'@backstage/cli': minor
+---
+
+Remove support for the deprecated `--experimental-type-build` option for `package build`.

.changeset/sour-toes-joke.md

@@ -0,0 +1,13 @@
+---
+'@backstage/plugin-user-settings-backend': patch
+'@backstage/plugin-scaffolder-backend': patch
+'@backstage/plugin-periskop-backend': patch
+'@backstage/plugin-scaffolder-node': patch
+'@backstage/plugin-bazaar-backend': patch
+'@backstage/plugin-kafka-backend': patch
+'@backstage/plugin-proxy-backend': patch
+'@backstage/plugin-sonarqube': patch
+'@backstage/plugin-todo': patch
+---
+
+Switched to using `"exports"` field for `/alpha` subpath export.