rxjs/Subject.d.ts error : Class 'Subject' incorrectly extends base class 'Observable'

Question

I extracted sample template code from this tutorial and did below two steps to get started -

1. npm install // worked fine and created node_modules folder

Answer 1

reinstalling rxjs -> npm install rxjs@6 rxjs-compat@6 --save

Answer 2

thanks the answer of zmag and Rahul Sharma, it works! @zmag @Rahul Sharma

  "rxjs": "5.4.1",
  "typescript": "~2.4.0"

my problem is as follow:

typings/globals/core-js/index.d.ts:3:14 - error TS2300: Duplicate identifier

Make changes as.

GO to Package.json file and modify the below configuration

  "rxjs": "5.4.1",
  "typescript": "~2.4.0"

Answer 3

GO to Package.json file and modify the below configuration

...
  "rxjs": "5.4.1",
  "typescript": "~2.4.0"
...

It will work

Answer 4

Just a little bit of detail, in an attempt to put in my two cents.

The problem arises when we upgrade Typescript to the latest version, which by now was TypeScript 2.4.1, [ "as we love the upgrades : )" ], and as mentioned by @Jonnysai in his answer and the link provided there, there is a detailed discussion regarding the problem and its fixes.

So, what worked for me was:
1. I had to Uninstall TypeScript 2.4.1 first, by going to Control Panel > Programs and Features...
2. Install, afresh, TypeScript 2.4.0, and then make sure, in package.json file, you have this


configuration, as mentioned here in a rather shorter detail.

You can download TypeScript 2.4.0 from here, for Visual Studio 2015

Answer 5

As per this you need update typescript 2.3.4 or rxjs 6 alpha

go the your package.json file in your project update typescript or rxjs version. Example

"typescript": "2.3.4"

do npm install

update(06/29/2017):-

As per the comments typescript "2.4.0" working.

Answer 6

Please change the following line of Subject.d.ts file:

lift<R>(operator: Operator<T, R>): Observable<T>;

to:

lift<R>(operator: Operator<T, R>): Observable<R>;

The return type should probably be Observable<R> rather than Observable<T>