Object assign gives error when bundling react native package

[arealmaas]

Using react native and this line: https://github.com/apollostack/react-apollo/blob/master/src/connect.tsx#L158 gives me the following error in the react native simulator:

One of the sources for assign has an enumerable key on the prototype chain. This is an edge case that we do not support. This error is a performance optimization and not spec compliant.

Anybody else receiving this?

[arealmaas]

changed from

var storeState = this.store.getState();
this.state = Object.assign({}, storeState)

to

var storeState = this.store.getState();
this.state = storeState.toJS()

And it started working again. Seems like an issue with Object.assign and react native, prooobably not related to this lib :))

[stubailo]

@jbaxleyiii perhaps we should use lodash.assign?

[jbaxleyiii]

@stubailo sounds good too me. I can change that out and open a PR this evening for it, unless you or someone else wants to get to it sooner?

Also, welcome back!

[stubailo]

Hey good to be back! So relaxing :) I can try, but I have a lot of meetings so it might be much later today.

[jbaxleyiii]

haha same here 👍

[arealmaas]

Does assign even work with immutable Map?

[arealmaas]

nvm.. The issue seems to be the use of immutable reducers.. Seems like react-apollo doesn't treat immutable data very well :)

[jbaxleyiii]

@AlmaasAre can you show me your usage? I'd love to improve this lib to support immutable data! Are you using immutable.js?

[arealmaas]

@jbaxleyiii Yes sure, thanks! Yes i am! When using the connect function it fails. Tries to deep copy state by using Object.assign which i believe doesn't work well with immutablejs. I also got some errors of wrong usage of Object.assign:

One of the sources for assign has an enumerable key on the prototype chain. This is an edge case that we do not support. This error is a performance optimization and not spec compliant.

I get this error by just using connect from apollo.

Dunno what needs to be done tho. Check if the state is immutable before assigning? not sure

[jbaxleyiii]

@AlmaasAre yep! I need to add in a check for immutablejs 👍

[aweary]

Does it make more sense to provide a way for the user to map their storeState to connect's local state? If you just add a check for immutable.js you'll still have the same problem when users are using other immutable libraries.

Instead maybe connect can accept a function like getStateFromStoreState that passes in storeState and lets the user parse and return a plain object representing their state.

[stubailo]

Apollo Client now supports React Native as of 0.3.27! Going to close this issue because most of the conversation is about Immutable.js and not React Native.

[davidyaha]

I think that with the 0.5.25 version of apollo-client that uses object spread and polyfills with Object.assign, this bug came back..
In my implementation this happens on refetch.
Also I think this issue belongs in apollo-client rather than here.

[helfer]

@davidyaha is this still the case for you with 0.7.1? If so, please open an issue on apollo-client! ❤️

[davidyaha]

Not sure.. I will update next week probably and if it reappears I'll open a new issue.