typescript tests and fixes

[rosskevin]

I improved the structure of the typescript exports (now strongly typed) and added tests for all the functions.

I believe I found the problem with #7 in that the package was referring to a js file instead of a ts file.

@erikras Please try a build and see if the ts gets included.

Closes #7
Depends on final-form/final-form#68

[rosskevin]

FYI - This casting is a bit gross, but unless we allow parameterized types in the form and expose it all the way through, this is the way it needs to be done. Parameterized types in jsx is already painful so this is not any worse by any means.

[codecov]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master     #8   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           8      8           
  Lines          48     48           
  Branches       10     10           
=====================================
  Hits           48     48

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[rosskevin]

I need to PR a change to react-final-form to FormRenderProps mutators to make this simpler (make sure they are not undefined). The test I have created in final-form/react-final-form-arrays#18 show that this will be really painful in a strongly typed application.

[rosskevin]

I don't have this quite right yet. Please hold and I'll work on it tomorrow. The import * as arrayMutators has default as the only member. I've tried a few quick things but did not work. I'll fix this tomorrow.

[erikras]

Okay. I upgraded the final-form dep. Let me know when this PR is good to go.

[rosskevin]

@erikras This one is good to merge/release

[erikras]

Published in v1.0.4.