rxjs/Subscription has no exported member 'Subscription'

问题

I updated my angular project and all my dependencies to latest version. Without to much trouble I solved most of the dependency issues, but I'm still stuck on RxJS. Here is my package.json:

  "dependencies": {
    "@angular-devkit/build-angular": "^0.6.0",
    "@angular/animations": "^6.0.0",
    "@angular/common": "^6.0.0",
    "@angular/compiler": "^6.0.0",
    "@angular/core": "^6.0.0",
    "@angular/forms": "^6.0.0",
    "@angular/http": "^6.0.0",
    "@angular/platform-browser": "^6.0.0",
    "@angular/platform-browser-dynamic": "^6.0.0",
    "@angular/router": "^6.0.0",
    "angular-bootstrap-md": "^6.0.1",
    "core-js": "^2.5.5",
    "font-awesome": "^4.7.0",
    "rxjs": "^6.1.0",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@angular/cli": "~6.0.0",
    "@angular/compiler-cli": "^6.0.0",
    "@angular/language-service": "6.0.0",
    "@types/jasmine": "~2.8.3",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~6.0.60",
    "codelyzer": "^4.0.1",
    "electron": "^1.8.3",
    "jasmine-core": "~2.8.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~2.0.2",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "^1.4.2",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^1.0.0",
    "protractor": "~5.3.1",
    "ts-node": "~6.0.2",
    "tslint": "~5.10.0",
    "typescript": "~2.7.2"

I'm only importing two modules from RxJS:

import { fromPromise } from 'rxjs/observable/fromPromise';
import { Subscription } from 'rxjs/Subscription';

They are both giving the same error:

    [ts] Module '"***/node_modules/rxjs/Subscription"' has no exported
 member 'Subscription'.

It's exactly the same for fromPromise. Here is the error message I'm getting from Subscribtion.d.ts (I have not modified the code in any way)

UPDATE:

The answers bellow solved the issue with Subscription but fromPromise still gives the same issue even though it's exported correctly:

export * from 'rxjs-compat/observable/fromPromise';

回答1:

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

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

回答2:

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

回答3:

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

回答4:

afaik Angular 6 and rxjs 6 are not already compatible, for the compatibility they created https://www.npmjs.com/package/rxjs-compat you have to install

[UPDATE] fromPromise is now "from". see here : https://github.com/ReactiveX/rxjs/issues/3525

来源：https://stackoverflow.com/questions/50176029/rxjs-subscription-has-no-exported-member-subscription

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