Some functions in the expo-file-system API can resolve to undefined in addition to being rejected, but I can’t find any explanation in the docs of how to interpret such a return value. What is the meaning of an undefined return (as opposed to rejection)?
Hey @orome 
If there’s any function that resolves to the value that is not described in the docs you can treat is as a bug. If such thing is happening to you should definitely create an issue describing such buggy scenario and we’ll investigate it further 
You can expect every function to return the value described in the docs and the TypeScript API, and the result of the function call should be always either rejection (with a meaningful message/value) or the actual result you’re expecting.
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