diff --git a/build.sh b/build.sh
index 6701cb8ccc..dd7aaaca92 100755
--- a/build.sh
+++ b/build.sh
@@ -472,8 +472,9 @@ do
       rsync -a ${OUT_DIR}/ ${NPM_DIR}
     fi
 
-    echo "======        Copy ${PACKAGE} package.json files"
+    echo "======        Copy ${PACKAGE} package.json and .externs.js files"
     rsync -am --include="package.json" --include="*/" --exclude=* ${SRC_DIR}/ ${NPM_DIR}/
+    rsync -am --include="*.externs.js" --include="*/" --exclude=* ${SRC_DIR}/ ${NPM_DIR}/
 
     cp ${ROOT_DIR}/README.md ${NPM_DIR}/
   fi
diff --git a/integration/hello_world__closure/bundle.sh b/integration/hello_world__closure/bundle.sh
index 0b4771698d..f8b7814693 100755
--- a/integration/hello_world__closure/bundle.sh
+++ b/integration/hello_world__closure/bundle.sh
@@ -34,7 +34,7 @@ CLOSURE_ARGS=(
   # Uncomment for easier debugging
   # "--formatting=PRETTY_PRINT"
 
-  e2e/testability.externs.js
+  node_modules/@angular/core/src/testability/testability.externs.js
   node_modules/zone.js/dist/zone.js
   $(find -L vendor/rxjs -name *.js)
   node_modules/@angular/core/@angular/core.js
diff --git a/integration/hello_world__closure/e2e/testability.externs.js b/integration/hello_world__closure/e2e/testability.externs.js
deleted file mode 100644
index a17161d38e..0000000000
--- a/integration/hello_world__closure/e2e/testability.externs.js
+++ /dev/null
@@ -1,47 +0,0 @@
-/** @externs */
-// Workaround for #11119
-// TODO(alexeagle): these externs ought to be distributed with Angular.
-/**
- * @externs
- * @suppress {duplicate}
- */
-// NOTE: generated by tsickle, do not edit.
-
-/** @record @struct */
-function BrowserNodeGlobal() {}
- /** @type {?} */
-BrowserNodeGlobal.prototype.getAngularTestability;
- /** @type {?} */
-BrowserNodeGlobal.prototype.getAllAngularTestabilities;
- /** @type {?} */
-BrowserNodeGlobal.prototype.getAllAngularRootElements;
- /** @type {?} */
-BrowserNodeGlobal.prototype.frameworkStabilizers;
-
-/**
- * @param {?} condition
- * @return {?}
- */
-BrowserNodeGlobal.prototype.assert = function(condition) {};
-
-/** @record @struct */
-function PublicTestability() {}
-
-/**
- * @return {?}
- */
-PublicTestability.prototype.isStable = function() {};
-
-/**
- * @param {?} callback
- * @return {?}
- */
-PublicTestability.prototype.whenStable = function(callback) {};
-
-/**
- * @param {?} using
- * @param {?} provider
- * @param {?} exactMatch
- * @return {?}
- */
-PublicTestability.prototype.findProviders = function(using, provider, exactMatch) {};
\ No newline at end of file
diff --git a/packages/core/src/testability/testability.externs.js b/packages/core/src/testability/testability.externs.js
new file mode 100644
index 0000000000..5db059634d
--- /dev/null
+++ b/packages/core/src/testability/testability.externs.js
@@ -0,0 +1,23 @@
+/** @externs */
+
+/** @record @struct */
+function PublicTestability() {}
+
+/**
+ * @return {?}
+ */
+PublicTestability.prototype.isStable = function() {};
+
+/**
+ * @param {?} callback
+ * @return {?}
+ */
+PublicTestability.prototype.whenStable = function(callback) {};
+
+/**
+ * @param {?} using
+ * @param {?} provider
+ * @param {?} exactMatch
+ * @return {?}
+ */
+PublicTestability.prototype.findProviders = function(using, provider, exactMatch) {};
\ No newline at end of file