Add TypeScript declaration for utils.js

[adam187]

Add missing declaration file for utils.js file.

import { localeUtils, dateUtils, modifiersUtils } from 'react-day-picker/utils'

[codecov-io]

Codecov Report

Merging #885 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #885   +/-   ##
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  Coverage     100%   100%           
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  Files          15     15           
  Lines         659    659           
  Branches      146    146           
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  Hits          659    659

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[DylanVann]

There doesn't need to be a declaration file for every source file, there just needs to be declarations for the public API

[adam187]

@DylanVann This file utils.js actually looks to me like public API.

Currently, you can't use utils function like in docs in typescript because of type/export conflicts but looks like this PR should solve it.

import { DateUtils } from "react-day-picker";

'DateUtils' only refers to a type, but is being used as a value here.ts

[DylanVann]

Yeah I’m aware of the issue I’m just not sure this will do anything to help, also aware of that PR since I made it :)

[gpbl]

#899 has been merged 🎊