fix(ivy): enable flat module index production in Bazel (#27655)

ngtsc now produces flat module index files when that option is enabled
in tsconfig, but Bazel still needs the output declared in order for them to
be passed through.

This fixes some tests which verify this behavior on Bazel.

FW-738 #resolve

PR Close #27655

packages/bazel/src/ng_module.bzl

@@ -201,13 +201,14 @@ def _expected_outs(ctx):
             metadata_files += [ctx.actions.declare_file(basename + ext) for ext in metadata]
 
     # We do this just when producing a flat module index for a publishable ng_module
-    if is_legacy_ngc and _should_produce_flat_module_outs(ctx):
+    if _should_produce_flat_module_outs(ctx):
         flat_module_out = _flat_module_out_file(ctx)
         devmode_js_files.append(ctx.actions.declare_file("%s.js" % flat_module_out))
         closure_js_files.append(ctx.actions.declare_file("%s.closure.js" % flat_module_out))
         bundle_index_typings = ctx.actions.declare_file("%s.d.ts" % flat_module_out)
         declaration_files.append(bundle_index_typings)
-        metadata_files.append(ctx.actions.declare_file("%s.metadata.json" % flat_module_out))
+        if is_legacy_ngc:
+            metadata_files.append(ctx.actions.declare_file("%s.metadata.json" % flat_module_out))
     else:
         bundle_index_typings = None
 

packages/bazel/test/ng_package/core_package.spec.ts

@@ -73,10 +73,8 @@ describe('@angular/core ng_package', () => {
 
 
     describe('typescript support', () => {
-
-      fixmeIvy('FW-738: ngtsc doesn\'t generate flat index files')
-          .it('should have an index d.ts file',
-              () => { expect(shx.cat('core.d.ts')).toContain(`export *`); });
+      it('should have an index d.ts file',
+         () => { expect(shx.cat('core.d.ts')).toContain(`export *`); });
 
       it('should not have amd module names',
          () => { expect(shx.cat('public_api.d.ts')).not.toContain('<amd-module name'); });