Error on npm start

[rajneeshm49]

Hello,
My node version is 7.10.0 and npm version is 5.0.3
I cloned the repository and inside root folder I ran npm install and npm start.
After that it gives me below error:

node_modules/rxjs/Subject.d.ts(16,22): error TS2415: Class 'Subject' incorrectly extends base class 'Observable'.
Types of property 'lift' are incompatible.
Type '(operator: Operator<T, R>) => Observable' is not assignable to type '(operator: Operator<T, R>) => Observable'.
Type 'Observable' is not assignable to type 'Observable'.
Type 'T' is not assignable to type 'R'.
node_modules/rxjs/observable/dom/WebSocketSubject.d.ts(24,22): error TS2415: Class 'WebSocketSubject' incorrectly extends base class 'AnonymousSubject'.
Types of property 'lift' are incompatible.
Type '(operator: Operator<T, R>) => WebSocketSubject' is not assignable to type '(operator: Operator<T, R>) => Observable'.
Type 'WebSocketSubject' is not assignable to type 'Observable'.
Types of property 'operator' are incompatible.
Type 'Operator<any, R>' is not assignable to type 'Operator<any, T>'.
Type 'R' is not assignable to type 'T'.
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! [email protected] start: tsc && concurrently "npm run tsc:w" "npm run lite"
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

[codebubb]

Hi @rajneeshm49,

There's an issue with the rxjs extensions working with TypeScript 2.4.1 (see ReactiveX/rxjs#2699)

Simple fix for it is to set the dependency for TypeScript to 2.4.0 or lower in your package.json. For example:

"devDependencies": {
        "@types/node": "^6.0.60",
        "concurrently": "^3.1.0",
        "lite-server": "^2.3.0",
        "typescript": "2.4.0"
    }

I was able to npm start after this. Hope that helps.

[cornflourblue]

This has been fixed in RxJS 5.4.2 so no need for a workaround anymore - microsoft/TypeScript#16593 (comment)