Describe the bug

The type for FuseIndex isn't exported in the Fuse namespace

Version

6.4.1

Is this a regression?

No

🔬Minimal Reproduction

import { FuseIndex } from "fuse.js"

Additional context

This makes it impossible to type the result of Fuse.createIndex without actually calling the method (say, storing the value in a map or loading from disk).

A non-obvious workaround is to do:

ReturnType<Fuse<GenericArgument>["getIndex"]>