fix(event): fix #1110, nodejs EventEmitter should support Symbol eventName

Author: JiaLiPassion

lib/common/events.ts

@@ -69,6 +69,8 @@ export interface PatchEventTargetOptions {
   diff?: (task: any, delegate: any) => boolean;
   // support passive or not
   supportPassive?: boolean;
+  // get string from eventName (in nodejs, eventName maybe Symbol)
+  eventNameToString?: (eventName: any) => string;
 }
 
 export function patchEventTarget(
@@ -212,6 +214,8 @@ export function patchEventTarget(
       return false;
     }
 
+    const eventNameToString = patchOptions && patchOptions.eventNameToString;
+
     // a shared global taskData to pass data for scheduleEventTask
     // so we do not need to create a new object just for pass some data
     const taskData: any = {};
@@ -380,8 +384,10 @@ export function patchEventTarget(
         let symbolEventName;
         if (!symbolEventNames) {
           // the code is duplicate, but I just want to get some better performance
-          const falseEventName = eventName + FALSE_STR;
-          const trueEventName = eventName + TRUE_STR;
+          const falseEventName =
+              (eventNameToString ? eventNameToString(eventName) : eventName) + FALSE_STR;
+          const trueEventName =
+              (eventNameToString ? eventNameToString(eventName) : eventName) + TRUE_STR;
           const symbol = ZONE_SYMBOL_PREFIX + falseEventName;
           const symbolCapture = ZONE_SYMBOL_PREFIX + trueEventName;
           zoneSymbolEventNames[eventName] = {};
@@ -414,7 +420,8 @@ export function patchEventTarget(
           source = targetSource[eventName];
         }
         if (!source) {
-          source = constructorName + addSource + eventName;
+          source = constructorName + addSource +
+              (eventNameToString ? eventNameToString(eventName) : eventName);
         }
         // do not create a new object as task.data to pass those things
         // just use the global shared one
@@ -552,7 +559,8 @@ export function patchEventTarget(
       const eventName = arguments[0];
 
       const listeners: any[] = [];
-      const tasks = findEventTasks(target, eventName);
+      const tasks =
+          findEventTasks(target, eventNameToString ? eventNameToString(eventName) : eventName);
 
       for (let i = 0; i < tasks.length; i++) {
         const task: any = tasks[i];

lib/node/events.ts

@@ -22,6 +22,16 @@ Zone.__load_patch('EventEmitter', (global: any) => {
     return task.callback === delegate || task.callback.listener === delegate;
   };
 
+  const eventNameToString = function(eventName: string|Symbol) {
+    if (typeof eventName === 'string') {
+      return eventName as string;
+    }
+    if (!eventName) {
+      return '';
+    }
+    return eventName.toString().replace('(', '_').replace(')', '_');
+  };
+
   function patchEventEmitterMethods(obj: any) {
     const result = patchEventTarget(global, [obj], {
       useG: false,
@@ -32,7 +42,8 @@ Zone.__load_patch('EventEmitter', (global: any) => {
       listeners: EE_LISTENERS,
       chkDup: false,
       rt: true,
-      diff: compareTaskCallbackVsDelegate
+      diff: compareTaskCallbackVsDelegate,
+      eventNameToString: eventNameToString
     });
     if (result && result[0]) {
       obj[EE_ON] = obj[EE_ADD_LISTENER];

test/node/events.spec.ts

@@ -183,4 +183,16 @@ describe('nodejs EventEmitter', () => {
       expect(emitter.listeners('removeListener').length).toBe(0);
     });
   });
+  it('should be able to addEventListener with symbol eventName', () => {
+    zoneA.run(() => {
+      const testSymbol = Symbol('test');
+      const test1Symbol = Symbol('test1');
+      emitter.on(testSymbol, expectZoneA);
+      emitter.on(test1Symbol, shouldNotRun);
+      emitter.removeListener(test1Symbol, shouldNotRun);
+      expect(emitter.listeners(testSymbol).length).toBe(1);
+      expect(emitter.listeners(test1Symbol).length).toBe(0);
+      emitter.emit(testSymbol, 'test value');
+    });
+  });
 });

tsconfig-esm-node.json

@@ -18,7 +18,8 @@
     "lib": [
       "es5",
       "dom",
-      "es2015.promise"
+      "es2015.promise",
+      "es2015.symbol"
     ]
   },
   "exclude": [

tsconfig-esm.json

@@ -26,6 +26,13 @@
     "build",
     "build-esm",
     "dist",
-    "lib/closure"
+    "lib/closure",
+    "lib/node/**",
+    "lib/mix/**",
+    "test/node/**",
+    "test/node_bluebird_entry_point.ts",
+    "test/node_entry_point.ts",
+    "test/node_error_entry_point.ts",
+    "test/node_tests.ts"
   ]
 }

tsconfig-node.json

@@ -16,7 +16,8 @@
     "lib": [
       "es5",
       "dom",
-      "es2015.promise"
+      "es2015.promise",
+      "es2015.symbol"
     ]
   },
   "exclude": [

tsconfig.json

@@ -23,6 +23,13 @@
     "build",
     "build-esm",
     "dist",
-    "lib/closure"
+    "lib/closure",
+    "lib/node/**",
+    "lib/mix/**",
+    "test/node/**",
+    "test/node_bluebird_entry_point.ts",
+    "test/node_entry_point.ts",
+    "test/node_error_entry_point.ts",
+    "test/node_tests.ts"
   ]
 }