Improve typings

[PabloDinella]

Really good features in v0.8! But looks like it's not possible to type a document anymore:

This is an important feature for typescript users like me :)

Another case is DocumentSearchResults, if you make it a discriminated union users can more elegantly determine its type when looping through it.

[ts-thomas]

Thanks a lot for the report. The default export was not declared in index.d.ts, it should be working now. You can also use named imports import { Document } from "flexsearch".
Something like "conditional types" rellay would help me, but I don't know how to declare those. If you know how to declare it would be nice when you provide a short example. The SearchResult depends on the options passed in.

[flycran]

Thanks a lot for the report. The default export was not declared in index.d.ts, it should be working now. You can also use named imports import { Document } from "flexsearch"。 Something like "conditional types" rellay would help me, but I don't know how to declare those. If you know how to declare it would be nice when you provide a short example. The SearchResult depends on the options passed in.

我知道如何编写泛型类型，这是我一直在深入研究的，我很乐意为flexsearch提供类型支持，因为我也在使用flexsearch的时候遇到了一样的类型问题，但我目前对flexsearch的了解还不够彻底，我可以开启一个新的pr，优先为我已经理解的部分修改类型定义，然后慢慢完善它。

[flycran]

Really good features in v0.8! But looks like it's not possible to type a document anymore:v0.8 版本中的功能真的很好！但看起来现在无法再输入文档了：

This is an important feature for typescript users like me :)这是我这样的 typescript 用户的一个重要功能！

Another case is DocumentSearchResults, if you make it a discriminated union users can more elegantly determine its type when looping through it.另一个例子是 DocumentSearchResults ，如果你将其设置为区分联合，那么在遍历时可以更优雅地确定其类型。

#497 我正在编写更好的类型支持