Add index.d.ts

[LumaKernel]

Adding typing.d.ts for TypeScript users ( and also including JS users ). It enables to use @begin/data in TypeScript way!

Most of doc comments are cited from https://docs.begin.com/en/data/begin-data

Some detailed of my decisions.

• Why undefined in { [key: string]: BeginDataType | undefined } in BeginDataType?
  • To enable to do {table:"foo", bar: "hi", ...{bar: undefined}} for deleting keys.
• Why err is Error | null | undefined instead of Error | null?
  • Some methods don't return null but undefined, so I decided to make it consistent.
  • For example, data.destroy([{ table, key }], (...args) => {console.log(args); }); shows [].
• I couldn't find documentation for .page() so I've added only typing for this.

Thank you!

[ryanblock]

We do not intend to formally support TypeScript, I think this would be a great contribution for https://github.com/DefinitelyTyped/DefinitelyTyped, wdyt?

[LumaKernel]

Okay, thanks! I will do that.

[ryanblock]

Right on! If you'd like to add myself and @brianleroux as co-maintainers, happy to provide backup/feedback where we can!

[LumaKernel]

I made the PR for DefinitelyTyped and applied necessary fixes. https://github.com/DefinitelyTyped/DefinitelyTyped/pull/54596 @ryanblock @brianleroux Thank you for running. I appreciate reviewing since it may take longer to wait reviewed by DefinitelyTyped owners. If you have time to review, would you visit above link? If you've reviewed, I'll add to owners!

[LumaKernel]

Ah, it looks I need to add as owners beforehand...? Can I add you two ( @ryanblock @brianleroux ) as maintainers?

[LumaKernel]

It's been merged and released as @types/begin__data ❤️

[ryanblock]

Yes, please add us as maintainers! Thanks for creating this, this is great!