Encountered an error: "switch/mergeAll/flatten is not a valid function" when working with the http driver

Question

Encountered an error: "switch/mergeAll/flatten is not a valid function" when working with the http driver

As I delve into learning CycleJS, one thing that has caught my attention is the usage of Cycle's HTTP Driver. It seems that in order to reach the stream level, merging the response stream stream with RxJS switch/mergeAll is essential. However, when attempting to implement these functions, a type error occurs: switch is not a function (on response stream stream).

  const response$$ = sources.HTTP
            .filter(response$ => response$.request.url === 'http://jsonplaceholder.typicode.com/users/1')
  const response$ = response$$.switch()

I am puzzled by this issue and would appreciate any insights on what might be going wrong.

javascript rxjs reactivex cyclejs

Answer 1

Answer №1

@cycle/http filter produces a metastream, lacking the typical capabilities of a regular stream.

To convert it into a regular stream, you need to extract the response$$ stream from the generated metastream after applying the filter function and then use flatten on it:

const response$$ = sources.HTTP
  .filter(response$ => response$.request.url === 'http://jsonplaceholder.typicode.com/users/1')
  .response$$
const response$ = response$$.flatten()

You can then proceed with using operators like map, depending on the version of Cycle.js being used. The latest versions utilize xstream as their stream engine.

@cycle/http response$$

When working with an HTTP Source, you can also access the meta stream using httpSource.response$$. Remember to flatten the metastream before consuming it to receive the response object from superagent.

Alternatively, you can simplify the process by doing:

const response$ = sources.HTTP
  .filter(response$ => response$.request.url === 'http://jsonplaceholder.typicode.com/users/1')
  .response$$.flatten()

Now you have the desired response$ to continue your operations.

Answer 2

@cycle/http filter produces a metastream, lacking the typical capabilities of a regular stream.

To convert it into a regular stream, you need to extract the response$$ stream from the generated metastream after applying the filter function and then use flatten on it:

const response$$ = sources.HTTP
  .filter(response$ => response$.request.url === 'http://jsonplaceholder.typicode.com/users/1')
  .response$$
const response$ = response$$.flatten()

You can then proceed with using operators like map, depending on the version of Cycle.js being used. The latest versions utilize xstream as their stream engine.

@cycle/http response$$

When working with an HTTP Source, you can also access the meta stream using httpSource.response$$. Remember to flatten the metastream before consuming it to receive the response object from superagent.

Alternatively, you can simplify the process by doing:

const response$ = sources.HTTP
  .filter(response$ => response$.request.url === 'http://jsonplaceholder.typicode.com/users/1')
  .response$$.flatten()

Now you have the desired response$ to continue your operations.

Answer 3

Answer №2

switch is a unique operator in RxJS, whereas its equivalent in xstream is flatten. The selection of which *-run package to import your run function from will determine the stream engine that drives your application. For instance, importing {run} from 'rx-run' will give you source streams from drivers using the stable RxJS 4 interface.

The introduction of multiple stream engines is a recent development with the latest release. It's recommended to check out the migration guide for more information.

Answer 4

switch is a unique operator in RxJS, whereas its equivalent in xstream is flatten. The selection of which *-run package to import your run function from will determine the stream engine that drives your application. For instance, importing {run} from 'rx-run' will give you source streams from drivers using the stable RxJS 4 interface.

The introduction of multiple stream engines is a recent development with the latest release. It's recommended to check out the migration guide for more information.

Encountered an error: "switch/mergeAll/flatten is not a valid function" when working with the http driver

Answer №1

Answer №2

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