Add localestorage support

[Belphemur]

To be able to use it in browser easily and rely on the storage mechanism there.

• Create a storage "interface"
• Implement driver for hard storage (current one)
• Implement storage for LocalStorage

[ZaneHannanAU]

Currently not possible without a rework (requires('') compatibility required for current implementation).

I'm working on it though, as one with Promises.

Not published, but see https://github.com/ZaneHannanAU/db-dot-json for more information.

[Belphemur]

@ZaneHannanAU Great work on implementing the Promises :)

I admit I gave up on Async as it was overkill for the usage I had of the lib at the time (hence the decision to use Sync filesystem calls).

[ZaneHannanAU]

@Belphemur The biggest issue with mine right now is that it doesn't work at all.

As in, not even the tests work lol

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Anyway, once you go promise for one thing; everything else must become a promise.

[Belphemur]

@ZaneHannanAU Yep, Promises are a double edge sword. One that I didn't wanted to impose on the user.

Also at the time I started the lib, there were easily 5-6 differents promise lib...

[Drarig29]

@Belphemur I think an easier solution would be to:

• Make the file persistance optional (for example by allowing null as a database filename in the JsonDB constructor)
• Add a public method exposing the private field named data (maybe a copy for security concerns)
• Let the user make his own solution (either outside of the library, or by passing a save callback function) to persist data manually
• Persisting in json files would remain the default behavior

I can do it in a PR... I need this feature 😁