borisyankov/DefinitelyTyped — pull request #2557 by Steve-Fenton (2014-07-25 07:18:17+00:00)
Title: Added extensibility point to Handlebars templates.

This allows named templates to be added, for example:

interface HandlebarsTemplates {
specialListOfThings: HandlebarsTemplateDelegate;
}

So the strongly typed version can be used.

var template = Handlebars.templates.specialListOfThings;