Use new `Store` interface from `express-rate-limit` v6

[gamemaker1]

Hi @okv,

I recently helped out with a Typescript rewrite for the express-rate-limit package, which also introduced a couple of changes to the Store interface:

• Added the init method for stores to set themselves up using options passed to the middleware.
• Rename the incr method to increment.
• Allow the increment, decrement, resetKey and resetAll methods to return a promise.
• Old stores will automatically be promisified and used.

As the external tests show, the store still works (without any changes) with v6 of express-rate-limit. However, implementing the newer Store interface allows for the following:

• The users do not need to pass expireTimeMs/windowMs twice (once to the middleware and once to the store) with the introduction of the init method.
• Since all functions can now return Promises, it removes the need for the numerous callbacks used in the code.

I would be happy to open/help out with a PR that implements the new Store interface.

Also, I see that #27 is still open and there is no @types/rate-limit-mongo package. Would you like this PR to also:

1. Rewrite the library in Typescript, OR
2. Add a type definition file (index.d.ts like what @gtmsingh has suggested in https://github.com/2do2go/rate-limit-mongo/issues/27#issuecomment-855444547) so that Typescript users don't encounter errors while using this library.

Please let me know your thoughts on the above.

Thanks, Vedant

// cc @nfriedly

[okv]

Hey @gamemaker1, to be honest I'm not a big TypeScript fan. But everything except it sounds awesome :smiley: I would keep the code in JS, but index.d.ts could be useful. Any assistance with reviewing #28 is highly appreciated. I will try to take a closer look at all this next weekend.

[gamemaker1]

Great, I'll start working on a PR this weekend! I'll also take a look at #28.

[FxllenCode]

Is this issue stale? Not to necrobump but it would be nice to support v6 👍

[gamemaker1]

@FxllenCode yes, this issue is stale since I have not gotten the time to convert the store to by yet :(

Although ypu could send in a PR as per the discussion above.