borisyankov/DefinitelyTyped — pull request #2834 by panuhorsmalahti (2014-09-16 09:21:30+00:00)
Title: Add exists function to i18next

The exists function is documented here:

http://i18next.com/pages/doc_features.html
"check if a key exists: i18n.exists("my.key", options); // same options as in t function"

This pull request includes a new test for the function.