Is this it?

Author: NullVoxPopuli

types/publish.mjs

@@ -104,6 +104,13 @@ async function main() {
 
   doOrDie(() => spawnSync('pnpm', ['tsc', '--project', 'tsconfig/publish-types.json']));
 
+  // We're deprecating the barrel file, so this is temporary. The Ember global is a namespace,
+  // and namespaces can't be both exported and used as a type with the same semantics and
+  // capabilities as when defined in the original file -- so we're going to LIE and
+  // pretend that the barrel file is the index file (which is the same behavior as
+  // prior to the deprecation)
+  await fs.cp(path.join(TYPES_DIR, 'ember/barrel.d.ts'), path.join(TYPES_DIR, 'ember/index.d.ts'));
+
   let remappedLocationExcludes = await doOrDie(copyHandwrittenDefinitions);
   let sideEffectExcludes = await doOrDie(copyRemappedLocationModules);