fixing possible Error:EPERM:operation not permitted,rename ...

[gaodeng]

fix #17
fix #15

[MaverickMartyn]

@gaodeng There seems to be an issue here.
According to the test output here,
storage.get("state") is returning undefined for some reason.
I am going to take a look, since I have my own fork now, in part because of the issues this PR is trying to fix.
In the meantime, perhaps you could have a look as well? I am not familiar with lodash, so it might take me some extra time.

[MaverickMartyn]

@gaodeng and @MrEmelianenko I have looked into this, and I don't think this is a very good solution.
The reason the tests fail, is because of the debounce's 1 second delay, causing the store to not have been persisted yet.
This then continues for the rest of the tests, since at no point is there more than 1 second between setState calls.

This would likely be the only real world scenario that would cause the error in the first place.
I therefore propose that we focus on providing options to limit the amount of times we save the state and limiting what is saved to it.
This could be done by for example deferring the persistance saving itself (while keeping the state in memory) and/or providing proper whitelist/blacklist support.

[summxu]

thanks my bro 问题解决，爱你摸摸哒

fix #17
fix #15

[yansenlei]

Why not merge

[jensstigaard]

I have the same issue on Windows as addressed by the PR. I have just used this PR, and it seem to fix the issue in practice, since the changes are persisted with a possible delay, and I don't experience errors.
It is of course not ideal that Windows cannot do rename atomically, and the current solution is to throttle to file updates to 1000ms, it is not ideal, but it does the job in practice.
As @MaverickMartyn states, it should be solved by figuring out how to refactor to atomically wait for the locking of the file before renaming the file.