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[ghost]

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[jvilk]

Not sure I grok 100% what you are trying to accomplish, but this should work as a polyfill for Node's file system module with the following caveats:

• Synchronous API calls are not available on some file systems. You can make any asynchronous file system synchronous with AsyncMirrorFS, with the caveat that it needs to asynchronously preload all of the files in the filesystem into a synchronous file system before you can use it (typically the InMemory file system).
• Read/write streams are currently not supported.
• Symlinks are not supported on most file systems, although that could change.
• User/group permissions are not supported on many file systems.

Does that answer your question?

[jvilk]

Closing for now since I think that's what you were asking. There's a summary of all available file system backends in the documentation. Some are data stores (localStorage, IndexedDB, Dropbox, etc), while others are meta (MountableFileSystem lets you mount file systems into a hierarchy, AsyncMirrorFS is what I described in the previous comment, etc).