react/cmd/stateGen: store date conflict

[lijianying10]

When the state has the same type of variable, it seems that the generated code store to the same key to
map rootNode.store.

[myitcv]

@lijianying10 I'm just getting round to your issues and PRs. Apologies again for the delay.

Please can you lay out what the actual issue is here, because I'm struggling to reverse engineer it from the short title 😄

Do you have an example of what went wrong?