rxjs/Subscription has no exported member 'Subscription'

There is a lot of breaking changes with RxJS 6. For example, prototype methods as

myObservable.map(data => data * 2)

won't work anymore and must be replaced by

myObservable.pipe(map(data => data * 2))

All details can be found here: https://github.com/ReactiveX/rxjs/blob/master/docs_app/content/guide/v6/migration.md

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Until you have fixed all breaking changes, you can make your old code work again with rxjs-compat (https://github.com/ReactiveX/rxjs/tree/master/compat).

This package is required to get backwards compatibility with RxJS previous to version 6. It contains the imports to add operators to Observable.prototype and creation methods to Observable.

Type this to install it:

npm install -s rxjs-compat

I hope your problem will resolve using this below statement import Subscription from 'rxjs'

You can fix it with this:

import {from} from 'rxjs';

And, instead of: return Observable.fromPromise(new Promise((resolve, reject) => {

Now just do:

return from(new Promise((resolve, reject) => {

The same applies to Observable.of