Property 'do' does not exist on type 'Observable'

Question

After upgrading to Angular 6.0 and Rxjs to 6.0 I receive the following compilation error:

Property \'do\' does not exist on type \'Observable\'.

Her

Answer 1

"do" operator had replaced with "tap" operator in rxjs 6 , that why this error occurs "Property 'do' does not exist on type 'Observable'"

To Fix this Error, you have two options

Solution 1: Patch your code ... it will work fine with do operator

npm install rxjs-compat@6 --save

Solution 2: Replace your next.handle code with below code

 return next.handle(req).pipe(
      tap(
        event => this.handleResponse(req, event),
        error => this.handleError(req, error)
      )
    );