Fix typescript declaration issue
Fix typescript declaration issue

Declare now needed: https://typescript.codeplex.com/wikipage?title=Known%20breaking%20changes%20between%200.8%20and%200.9

typescript-ruby/typescript-rails,typescript-ruby/typescript-rails,preetpalS/typescript-sprockets,bdrazhzhov/typescript-rails,bdrazhzhov/typescript-rails,bdrazhzhov/typescript-rails,typescript-ruby/typescript-rails