Add declaration true to tsconfig

[kitsonk]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

Ensure that declarations are generated when doing a development build.

References dojo/meta#200

[codecov]

Codecov Report

Merging #144 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   86.08%   86.08%           
=======================================
  Files           1        1           
  Lines         546      546           
  Branches      133      133           
=======================================
  Hits          470      470           
  Misses         32       32           
  Partials       44       44

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