cli: add support for trimming next entry

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/friendly-cougars-return.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Added support for a new experimental `EXPERIMENTAL_TRIM_NEXT_ENTRY` flag which removes any `./next` entry points present in packages when building and publishing.

packages/cli/src/lib/entryPoints.ts

@@ -67,6 +67,11 @@ export function readEntryPoints(pkg: BackstagePackageJson): Array<EntryPoint> {
         );
       }
 
+      // Setting the EXPERIMENTAL_TRIM_NEXT_ENTRY flag will remove any `./next` entry points
+      if (process.env.EXPERIMENTAL_TRIM_NEXT_ENTRY && mount === './next') {
+        continue;
+      }
+
       entryPoints.push(parseEntryPoint(mount, path));
     }