rxjs 5 tree shaking

[rafaelkallis]

Currently, the rxjs config of recompose, for the mapStreamToProps and componentFromStream enhancers, imports the whole rxjs library. This is quite bad for size-sensitive builds.

As described here, it is possible to selectively import the features we need from rxjs in order to reduce the build size.

In this PR, I have changed the rxjs 5 config such that only necessary features get imported, dramatically decreasing build size for apps using the enhancers mentioned above with rxjs 5.

In my current app, I have reduced the production build size by 100KB with this change.

[rafaelkallis]

@acdlite question regarding the travis config, isn't a yarn install necessary? Or am I missing something obvious here? I believe that's the reason the travis checks are failing.

The tests are just fine when running on my local machine.

[TrySound]

@rafaelkallis I guess it's because observable directory is not capitalized in this package.

[istarkov]

Thank you.
Just from is useless, then users need to use bind operator or add other rx operators via global import. Everyone can create and use his own config if he need to reduce app size, or use smaller rx alternatives.

[codecov-io]

Codecov Report

Merging #422 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #422   +/-   ##
======================================
  Coverage    88.8%   88.8%           
======================================
  Files          51      51           
  Lines         375     375           
======================================
  Hits          333     333           
  Misses         42      42

Impacted Files	Coverage Δ
src/packages/recompose/rxjsObservableConfig.js	100% <ø> (ø)	⬆️

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[rafaelkallis]

@TrySound thanks for the tip, seems to work now.

@istarkov thanks for the feedback. The uselessness of only importing from is relative to the use-case. At least it should be mentioned in the docs that the rxjsConfig imports the whole rxjs lib and therefore is not suitable for size-sensitive builds. We could also make a separate rxjsLiteConfig. What are your thoughts?

[istarkov]

I think that change of documentation is ok,
I thinks that we can place a link to gist with rxjsLiteConfig there too, as there are a lot of cases where we need an additional config, as an example SSR config to avoid memory leaks #328 (comment)
Having that every library can have similar problems we could get enormous amount of configs ;-) we need to support
I'll approve such PR

[wuct]

Having that every library can have similar problems we could get enormous amount of configs ;-) we need to support

In that case, I think we should create a dedicated page for them.

[rafaelkallis]

@istarkov sounds reasonable to me, PR can be closed in that case.