bazel: check cycle test

BUILD

@@ -853,3 +853,29 @@ public_api_test(
     public_api = ":public_api",
     size = "small",
 )
+
+nodejs_test(
+    name = "check_cycle_test",
+    srcs = [
+        "//build_defs:check_cycle.js",
+    ],
+    deps = [
+        ":madge",
+    ],
+    entry_point = "check_cycle.js",
+    data = [
+        ":core",
+        ":common",
+        ":compiler",
+        ":compiler-cli",
+        ":forms",
+        ":http",
+        ":platform-browser",
+        ":platform-browser-dynamic",
+        ":platform-server",
+        ":router",
+        ":upgrade",
+        ":tsc-wrapped",
+    ],
+    size = "small",
+)

build_defs/BUILD

@@ -5,4 +5,5 @@ exports_files([
     "rollup_config_template.js",
     "protractor_launcher_template.sh",
     "ts_api_guardian_launcher_template.sh",
+    "check_cycle.js",
 ])

build_defs/check_cycle.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const madge = require('madge');
+
+const dependencyObject = madge([process.env.RUNFILES + '/modules/'], {
+  format: 'cjs',
+  extensions: ['.js'],
+  onParseFile: function(data) { data.src = data.src.replace(/\/\* circular \*\//g, '//'); }
+});
+
+const circularDependencies = dependencyObject.circular().getArray();
+if (circularDependencies.length > 0) {
+  console.log('Found circular dependencies!');
+  console.log(circularDependencies);
+  process.exit(1);
+}