fix(typescript): correctly import long

[callmehiphop]

Fixes #526

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[codecov]

Codecov Report

Merging #541 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #541   +/-   ##
=======================================
  Coverage   94.81%   94.81%           
=======================================
  Files          16       16           
  Lines         965      965           
  Branches       86       86           
=======================================
  Hits          915      915           
  Misses         42       42           
  Partials        8        8

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[bcoe]

I think we should probably use mkdirp for the directory creation, so that we work on Windows (and other platforms without mkdir).

Otherwise, this looks good to me; up to you whether you add mkdirp in another pull request (I probably would).

[bcoe]

thank you \o/