diff --git a/aio/tools/transforms/angular-api-package/tag-defs/nocollapse.js b/aio/tools/transforms/angular-api-package/tag-defs/nocollapse.js
new file mode 100644
index 0000000000..71c62ca536
--- /dev/null
+++ b/aio/tools/transforms/angular-api-package/tag-defs/nocollapse.js
@@ -0,0 +1,7 @@
+// A fake annotation to prevent Closure compiler from modifying the
+// associated code.
+// See https://github.com/angular/angular/blob/master/packages/compiler-cli/src/transformers/nocollapse_hack.ts
+// We must provide a tag-def for it or the doc-gen will error.
+module.exports = function() {
+  return {name: 'nocollapse'};
+};