test(zone.js): add zone.js externs test (#39108)

Add back the zone.js externs file test for google closure compiler.
The test compiles a test program with and without `zone_externs`.

1. With `zone_externs`, the code should keep the APIs defined in the `zone_externs`.
2. Without `zone_externs`, the code will not keep these APIs.

PR Close #39108

.circleci/config.yml

@@ -728,6 +728,7 @@ jobs:
     steps:
       - custom_attach_workspace
       - init_environment
+      - install_java
         # Install
       - run: yarn --cwd packages/zone.js install --frozen-lockfile --non-interactive
         # Run zone.js tools tests
@@ -736,9 +737,11 @@ jobs:
       - run: yarn bazel build //packages/zone.js:npm_package &&
              cp dist/bin/packages/zone.js/npm_package/bundles/zone-mix.umd.js ./packages/zone.js/test/extra/ &&
              cp dist/bin/packages/zone.js/npm_package/bundles/zone-patch-electron.umd.js ./packages/zone.js/test/extra/ &&
-             yarn --cwd packages/zone.js electrontest
+             cp dist/bin/packages/zone.js/npm_package/bundles/zone.umd.js ./packages/zone.js/build/test/closure/zone.js
       - run: yarn --cwd packages/zone.js jest:test
       - run: yarn --cwd packages/zone.js jest:nodetest
+      - run: yarn --cwd packages/zone.js electrontest
+      - run: yarn --cwd packages/zone.js closuretest
       - run: yarn --cwd packages/zone.js/test/typings install --frozen-lockfile --non-interactive
       - run: yarn --cwd packages/zone.js/test/typings test
 

packages/zone.js/.gitignore

@@ -0,0 +1 @@
+build

packages/zone.js/package.json

@@ -11,15 +11,18 @@
     "tslib": "^2.0.0"
   },
   "devDependencies": {
+    "@externs/nodejs": "^1.5.0",
     "@types/node": "^10.9.4",
     "domino": "2.1.2",
     "jest": "^26.4",
+    "google-closure-compiler": "^20200927.0.0",
     "mocha": "^3.1.2",
     "mock-require": "3.0.3",
     "promises-aplus-tests": "^2.1.2",
     "typescript": "4.0.2"
   },
   "scripts": {
+    "closuretest": "./scripts/closure/closure_compiler.sh",
     "electrontest": "cd test/extra && node electron.js",
     "jest:test": "jest --config ./test/jest/jest.config.js ./test/jest/jest.spec.js",
     "jest:nodetest": "jest --config ./test/jest/jest.node.config.js ./test/jest/jest.spec.js",

packages/zone.js/scripts/closure/closure_compiler.sh

@@ -1,10 +1,10 @@
 # compile closure test source file
 $(npm bin)/tsc -p .
 # Run the Google Closure compiler java runnable with zone externs
-java -jar node_modules/google-closure-compiler/compiler.jar --flagfile 'scripts/closure/closure_flagfile' --externs 'lib/closure/zone_externs.js'
+java -jar ./node_modules/google-closure-compiler-java/compiler.jar --flagfile './scripts/closure/closure_flagfile' --externs './lib/closure/zone_externs.js' --externs './node_modules/@externs/nodejs/v8/global.js' --process_common_js_modules
 
 # the names of Zone exposed API should be kept correctly with zone externs, test program should exit with 0.
-node build/closure/closure-bundle.js
+node build/closure/zone-closure-bundle.js
 
 if [ $? -eq 0 ]
 then
@@ -15,10 +15,9 @@ else
 fi
 
 # Run the Google Closure compiler java runnable without zone externs.
-java -jar node_modules/google-closure-compiler/compiler.jar --flagfile 'scripts/closure/closure_flagfile'
+java -jar node_modules/google-closure-compiler-java/compiler.jar --flagfile 'scripts/closure/closure_flagfile' --externs './node_modules/@externs/nodejs/v8/global.js' --process_common_js_modules
 
-# the names of Zone exposed API should be renamed and fail to be executed, test program should exit with 1.
-node build/closure/closure-bundle.js
+node build/closure/zone-closure-bundle.js
 
 if [ $? -eq 1 ]
 then

packages/zone.js/scripts/closure/closure_flagfile

@@ -1,5 +1,6 @@
 --compilation_level ADVANCED_OPTIMIZATIONS
---js_output_file "build/closure/closure-bundle.js"
+--js_output_file "build/closure/zone-closure-bundle.js"
 --rewrite_polyfills false
+--js "build/test/closure/zone.js"
 --js "build/test/closure/zone.closure.js"
 --formatting PRETTY_PRINT

packages/zone.js/test/closure/zone.closure.ts

@@ -5,7 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import '../../dist/zone-node';
+import './zone.js';
 const testClosureFunction = () => {
   const logs: string[] = [];
   // call all Zone exposed functions
@@ -72,28 +72,64 @@ const testClosureFunction = () => {
       logs.push('getZoneWith' + keyZone!.name);
       logs.push('get' + keyZone!.get('key'));
       logs.push('root' + Zone.root.name);
-      Object.keys((Zone as any).prototype).forEach(key => {
-        logs.push(key);
-      });
-      Object.keys(testZoneSpec).forEach(key => {
-        logs.push(key);
-      });
-
-      const task = Zone.current.scheduleMicroTask('testTask', () => {}, undefined, () => {});
-      Object.keys(task).forEach(key => {
-        logs.push(key);
-      });
-    });
-  });
-
-  const expectedResult = [
-    'currentclosure',
-    'parent<root>',
-    'getZoneWithclosure',
-    'getvalue',
-    'root<root>',
-    'parent',
-    'name',
+      const zonePrototypeKeys = [
+        'get',
+        'getZoneWith',
+        'fork',
+        'wrap',
+        'run',
+        'runGuarded',
+        'runTask',
+        'scheduleTask',
+        'scheduleMicroTask',
+        'scheduleMacroTask',
+        'scheduleEventTask',
+        'cancelTask',
+      ];
+      zonePrototypeKeys.forEach(key => {
+        if ((Zone as any).prototype.hasOwnProperty(key)) {
+          logs.push(key);
+        }
+      });
+
+      const zoneSpecKeys = [
+        'name',
+        'properties',
+        'onFork',
+        'onIntercept',
+        'onInvoke',
+        'onHandleError',
+        'onScheduleTask',
+        'onInvokeTask',
+        'onCancelTask',
+        'onHasTask',
+      ];
+      zoneSpecKeys.forEach(key => {
+        if (testZoneSpec.hasOwnProperty(key)) {
+          logs.push(key);
+        }
+      });
+
+      const zoneTaskKeys = [
+        'onHasTask', 'runCount', 'type', 'source', 'data', 'scheduleFn', 'cancelFn', 'callback',
+        'invoke'
+      ];
+
+      const task = Zone.current.scheduleMicroTask('testTask', () => {}, undefined, () => {});
+      zoneTaskKeys.forEach(key => {
+        if (task.hasOwnProperty(key)) {
+          logs.push(key);
+        }
+      });
+    });
+  });
+
+  const expectedResult = [
+    'currentclosure',
+    'parent<root>',
+    'getZoneWithclosure',
+    'getvalue',
+    'root<root>',
     'get',
     'getZoneWith',
     'fork',
@@ -106,7 +142,6 @@ const testClosureFunction = () => {
     'scheduleMacroTask',
     'scheduleEventTask',
     'cancelTask',
-    '_updateTaskCount',
     'name',
     'properties',
     'onFork',
@@ -117,10 +152,7 @@ const testClosureFunction = () => {
     'onInvokeTask',
     'onCancelTask',
     'onHasTask',
-    '_zone',
     'runCount',
-    '_zoneDelegates',
-    '_state',
     'type',
     'source',
     'data',
@@ -137,6 +169,11 @@ const testClosureFunction = () => {
       result = false;
     }
   }
+  if (result) {
+    console.log('All tests passed.');
+  } else {
+    console.error('Test failed, some public APIs cannot be found after closure compiler.');
+  }
   process['exit'](result ? 0 : 1);
 };
 process['on']('uncaughtException', (err: any) => {