Add key typings for Fuse expressions

[MariaSolOs]

Description

It would be nice to have type information about the keys used for creating the Fuse instance when creating Fuse expressions.

As an example, say I have the following data set:

data = [
  {
    "title": "Old Man's War",
    "author": "John Scalzi"
  },
  {
    "title": "The Lock Artist",
    "author": "Steve"
  }
]

And I create the Fuse instance with const fuse = new Fuse(data, { keys: [ 'title' ] }). Then when writing fuse.search({ $or: [{ ;, I would like to have a completion suggestion for 'title' as my key for the $or clause.

Describe the solution you'd like

I imagine the solution being something like creating a temporary union literal type that corresponds to allowed keys for these logical query operators.

Describe alternatives you've considered

I guess one could maintain the typings independently from the Fuse implementation, but these would just add extra setup to maintain which could easily be integrated with this wonderful library.

[MariaSolOs]

I should also mention that if this sounds like a reasonable feature, I would love to work on it!

[github-actions[bot]]

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