core.js:1673 ERROR Error: Uncaught (in promise): TypeError: instance[output.propName].subscribe is not a function

Hi Guys ,

Today I have faced this error :

core.js:1673 ERROR Error: Uncaught (in promise): TypeError: instance[output.propName].subscribe is not a function

Later I have found out that I have imported the EventEmitter from a different package in my component file :

import { EventEmitter } from 'events';

Later when I changed the package to @angular/core it worked fine .

import { EventEmitter } from '@angular/core';

The full stack trace is below for your reference :

ERROR Error: Uncaught (in promise): TypeError: instance[output.propName].subscribe is not a function
TypeError: instance[output.propName].subscribe is not a function
    at createDirectiveInstance (core.js:9183)
    at createViewNodes (core.js:10399)
    at callViewAction (core.js:10715)
    at execComponentViewsAction (core.js:10634)
    at createViewNodes (core.js:10427)
    at createRootView (core.js:10313)
    at callWithDebugContext (core.js:11344)
    at Object.debugCreateRootView [as createRootView] (core.js:10831)
    at ComponentFactory_.push../node_modules/@angular/core/fesm5/core.js.ComponentFactory_.create (core.js:8659)
    at ComponentFactoryBoundToModule.push../node_modules/@angular/core/fesm5/core.js.ComponentFactoryBoundToModule.create (core.js:3311)
    at resolvePromise (zone.js:831)
    at resolvePromise (zone.js:788)
    at zone.js:892
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:423)
    at Object.onInvokeTask (core.js:3811)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:422)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:195)
    at drainMicroTaskQueue (zone.js:601)
defaultErrorLogger @ core.js:1673
push../node_modules/@angular/core/fesm5/core.js.ErrorHandler.handleError @ core.js:1719
next @ core.js:4311
schedulerFn @ core.js:3551
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.__tryOrUnsub @ Subscriber.js:196
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.next @ Subscriber.js:134
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._next @ Subscriber.js:77
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next @ Subscriber.js:54
push../node_modules/rxjs/_esm5/internal/Subject.js.Subject.next @ Subject.js:47
push../node_modules/@angular/core/fesm5/core.js.EventEmitter.emit @ core.js:3535
(anonymous) @ core.js:3842
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:391
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:150
push../node_modules/@angular/core/fesm5/core.js.NgZone.runOutsideAngular @ core.js:3779
onHandleError @ core.js:3842
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.handleError @ zone.js:395
push../node_modules/zone.js/dist/zone.js.Zone.runGuarded @ zone.js:164
_loop_1 @ zone.js:694
api.microtaskDrainDone @ zone.js:703
drainMicroTaskQueue @ zone.js:608
Promise.then (async)
scheduleMicroTask @ zone.js:584
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:413
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:238
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMicroTask @ zone.js:258
scheduleResolveOrReject @ zone.js:879
ZoneAwarePromise.then @ zone.js:1012
push../node_modules/@angular/core/fesm5/core.js.PlatformRef.bootstrapModule @ core.js:4345
./src/main.ts @ main.ts:11
__webpack_require__ @ bootstrap:76
0 @ main.ts:12
__webpack_require__ @ bootstrap:76
checkDeferredModules @ bootstrap:43
webpackJsonpCallback @ bootstrap:30
(anonymous) @ main.js:1