diff --git a/packages/concatjs/third_party/google3/rules_typescript/defs.bzl b/packages/concatjs/third_party/google3/rules_typescript/defs.bzl
index 4c29df52d2..5c537d6d07 100644
--- a/packages/concatjs/third_party/google3/rules_typescript/defs.bzl
+++ b/packages/concatjs/third_party/google3/rules_typescript/defs.bzl
@@ -17,3 +17,4 @@
 Users should not load files under "/internal"
 """
 load("//internal:build_defs.bzl", "ts_library")
+load("//internal:ts_config.bzl", "ts_config")
diff --git a/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/BUILD.bazel b/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/BUILD.bazel
new file mode 100644
index 0000000000..e1d13f65bf
--- /dev/null
+++ b/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/BUILD.bazel
@@ -0,0 +1,35 @@
+# Copyright 2017 The Bazel 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.
+
+package(default_visibility = ["//visibility:public"])
+
+load("//:defs.bzl", "ts_config", "ts_library")
+
+# Because our tsconfig.json has an extends property, we must also tell the
+# ts_library to include the extended tsconfig file in compilations.
+# The ts_library rule will generate its own tsconfig which extends from the
+# src file.
+ts_config(
+    name = "tsconfig",
+    src = "tsconfig.json",
+    deps = ["tsconfig-base.json"],
+)
+
+ts_library(
+    name = "tsconfig_extends",
+    srcs = [
+        "uses_promise.ts",
+    ],
+    tsconfig = ":tsconfig",
+)
diff --git a/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/tsconfig-base.json b/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/tsconfig-base.json
new file mode 100644
index 0000000000..b549881810
--- /dev/null
+++ b/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/tsconfig-base.json
@@ -0,0 +1,5 @@
+{
+  "compilerOptions": {
+    "lib": ["es2015.promise", "es5"]
+  }
+}
\ No newline at end of file
diff --git a/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/tsconfig.json b/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/tsconfig.json
new file mode 100644
index 0000000000..712de299b0
--- /dev/null
+++ b/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig-base"
+}
+
diff --git a/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/uses_promise.ts b/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/uses_promise.ts
new file mode 100644
index 0000000000..4d2e73b457
--- /dev/null
+++ b/packages/concatjs/third_party/google3/rules_typescript/examples/tsconfig_extends/uses_promise.ts
@@ -0,0 +1,3 @@
+export function hiLater(): Promise<string> {
+  return Promise.resolve('hi');
+}
diff --git a/packages/concatjs/third_party/google3/rules_typescript/internal/build_defs.bzl b/packages/concatjs/third_party/google3/rules_typescript/internal/build_defs.bzl
index a79ffb8fb7..ed80d0d118 100644
--- a/packages/concatjs/third_party/google3/rules_typescript/internal/build_defs.bzl
+++ b/packages/concatjs/third_party/google3/rules_typescript/internal/build_defs.bzl
@@ -19,6 +19,7 @@
 load(":common/compilation.bzl", "COMMON_ATTRIBUTES", "compile_ts", "ts_providers_dict_to_struct")
 load(":executables.bzl", "get_tsc")
 load(":common/tsconfig.bzl", "create_tsconfig")
+load(":ts_config.bzl", "TsConfig")
 
 def _compile_action(ctx, inputs, outputs, config_file_path):
   externs_files = []
@@ -39,6 +40,8 @@ def _compile_action(ctx, inputs, outputs, config_file_path):
                             if f.path.endswith(".ts") or f.path.endswith(".json")]
   if ctx.file.tsconfig:
     action_inputs += [ctx.file.tsconfig]
+    if TsConfig in ctx.attr.tsconfig:
+      action_inputs += ctx.attr.tsconfig[TsConfig].deps
 
   # One at-sign makes this a params-file, enabling the worker strategy.
   # Two at-signs escapes the argument so it's passed through to tsc_wrapped
@@ -103,7 +106,7 @@ def tsc_wrapped_tsconfig(ctx,
   # this gives extra error-checking.
   if ctx.file.tsconfig:
     workspace_path = config["compilerOptions"]["rootDir"]
-    config["extends"] = "/".join([workspace_path, ctx.file.tsconfig.path[:-5]])
+    config["extends"] = "/".join([workspace_path, ctx.file.tsconfig.path[:-len(".json")]])
 
   return config
 
@@ -141,14 +144,14 @@ ts_library = rule(
         # be portable across internal/external, so we need this attribute
         # internally as well.
         "tsconfig":
-            attr.label(allow_files = True, single_file=True),
+            attr.label(allow_files = True, single_file = True),
         "compiler":
             attr.label(
                 default=get_tsc(),
                 single_file=False,
                 allow_files=True,
                 executable=True,
-                cfg="host",),
+                cfg="host"),
         "supports_workers": attr.bool(default = True),
         # @// is special syntax for the "main" repository
         # The default assumes the user specified a target "node_modules" in their
diff --git a/packages/concatjs/third_party/google3/rules_typescript/internal/ts_config.bzl b/packages/concatjs/third_party/google3/rules_typescript/internal/ts_config.bzl
new file mode 100644
index 0000000000..0aa4690dde
--- /dev/null
+++ b/packages/concatjs/third_party/google3/rules_typescript/internal/ts_config.bzl
@@ -0,0 +1,31 @@
+# Copyright 2017 The Bazel 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.
+
+"""The ts_config rule allows users to express tsconfig.json file groups.
+"""
+
+TsConfig = provider()
+
+def _ts_config_impl(ctx):
+  files = depset()
+  files += [ctx.file.src]
+  return [DefaultInfo(files = files), TsConfig(deps = ctx.files.deps)]
+
+ts_config = rule(
+    implementation = _ts_config_impl,
+    attrs = {
+      "src": attr.label(allow_files = True, single_file = True, mandatory = True),
+      "deps": attr.label_list(allow_files = True, mandatory = True),
+    },
+)