TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable.

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed
• I’m reporting the issue to the correct repository (not related to Angular, AngularCLI or any dependency)

Expected Behavior

Make e2e tests

Current Behavior

Failure with the following error: TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable.

Failure Information (for bugs)

It seems to be something when running e2e cypress test with a react project

Steps to Reproduce

npm run e2e react-app-e2e

Context

• version of Nx used 8.6.0

Failure Logs

TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable.
    at Object.exports.subscribeTo (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/util/subscribeTo.js:29:15)
    at Object.subscribeToResult (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/util/subscribeToResult.js:14:26)
    at SwitchMapSubscriber._innerSub (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/operators/switchMap.js:65:54)
    at SwitchMapSubscriber._next (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/operators/switchMap.js:55:14)
    at SwitchMapSubscriber.Subscriber.next (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/Subscriber.js:66:18)
    at MapSubscriber._next (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/operators/map.js:55:26)
    at MapSubscriber.Subscriber.next (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/Subscriber.js:66:18)
    at MapSubscriber._next (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/operators/map.js:55:26)
    at MapSubscriber.Subscriber.next (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/Subscriber.js:66:18)
    at Object.complete (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/observable/forkJoin.js:57:40)
    at Object.wrappedComplete (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/Subscriber.js:188:76)
    at SafeSubscriber.__tryOrUnsub (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/Subscriber.js:205:16)
    at SafeSubscriber.complete (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/Subscriber.js:190:26)
    at Subscriber._complete (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/Subscriber.js:96:26)
    at Subscriber.complete (/Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/Subscriber.js:78:18)
    at /Users/jose.sanchez/Documents/shapeletsProjects/@shapelets-cristal-ui/node_modules/rxjs/internal/util/subscribeToPromise.js:8:24
    at process._tickCallback (internal/process/next_tick.js:68:7)
    at Function.Module.runMain (internal/modules/cjs/loader.js:834:11)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)

[oak-wildwood]

This is because your workspace has multiple versions of RxJS. RxJS version 1 doesn’t recognize observable from RxJS version 2. If you are using Yarn, you can tell Yarn to use one version of RxJS. The easier way to do with NPM is to delete every other version of RxJS except the root one.

My projects seems to have rxjs@5.5.12 installed under cypress@3.4.1 > listr@0.12.0. But that is a direct dependency of listr. So I’m not quite sure how to delete that one without other things breaking.

Thanks for the quick fix though.

@kpaxton - Did you figure out a workaround? I don’t really understand why this fix isn’t working for me. I’m running nx 9.4.5 so I think it should be included. Currently I see rxjs@5.5.12 installed by cypress@3.8.3 > listr@0.12.0. Seeing as this version of Cypress is included in by nx cli I don’t see how this ever worked for anyone.

EDIT: I was able to get it working by updating to latest (9.5.0-beta.1) and then manually updating cypress to 4.1.0 as it didn’t update it in package.json for some reason. Working now.

[vsavkin]

This is because your workspace has multiple versions of RxJS. RxJS version 1 doesn’t recognize observable from RxJS version 2. If you are using Yarn, you can tell Yarn to use one version of RxJS. The easier way to do with NPM is to delete every other version of RxJS except the root one.

There is a workaround with setting a special symbol that resolves it, but i can only apply it to the builders we own.