From fdd233f9a5bd92175c068351107497da11bf52da Mon Sep 17 00:00:00 2001
From: Ryan Cebulko <ryan@cebulko.com>
Date: Thu, 29 Apr 2021 12:28:40 -0400
Subject: [PATCH] Missing things

---
 build-system/test-configs/dep-check-config.js |  6 ++---
 src/core/assert/assert.extern.js              | 25 +++++++++++++++++++
 2 files changed, 28 insertions(+), 3 deletions(-)
 create mode 100644 src/core/assert/assert.extern.js

diff --git a/build-system/test-configs/dep-check-config.js b/build-system/test-configs/dep-check-config.js
index 6f1bd5f2747a8..d716c1c950b0c 100644
--- a/build-system/test-configs/dep-check-config.js
+++ b/build-system/test-configs/dep-check-config.js
@@ -506,9 +506,9 @@ exports.rules = [
     filesMatching: '**/*.js',
     mustNotDependOn: 'src/core/assert/base.js',
     allowlist: [
-      'src/core/assert/dev.js',
-      'src/core/assert/user.js',
-      'src/log.js',
+      'src/core/assert/dev.js->src/core/assert/base.js',
+      'src/core/assert/user.js->src/core/assert/base.js',
+      'src/log.js->src/core/assert/base.js',
     ],
   },
 
diff --git a/src/core/assert/assert.extern.js b/src/core/assert/assert.extern.js
new file mode 100644
index 0000000000000..7d261a8f5f940
--- /dev/null
+++ b/src/core/assert/assert.extern.js
@@ -0,0 +1,25 @@
+/**
+ * Copyright 2021 The AMP HTML Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Type externs for assertions.
+ * @externs
+ */
+
+/**
+ * @typedef {function(?, string=, ...*):?|function(?, !Array<*>)}
+ */
+let AssertionFunction;