Question

let’s say you have a date_ext.js with functions:

Date.prototype.getMyBlaDate = function() {
  return // bla bla
};

Date.minutesBetween = function (date1, date2) {
  return // obladi-oblada
}

You don’t want to convert entire file into typescript but you still can use the methods from it.
Let’s create a definition for typescript

interface Date{
  getMyBlaDate():BlaBlaType;
  minutesBetween(date1:Date, date2:Date):ObladiType; 
}

it will work for prototyped method but not for the static one.
How do you define static method?

Answer 1

From looking at lib.d.ts is appears you would use:

declare var Date: {
    minutesBetween(date1:Date, date2:Date):ObladiType;
}

UPDATE

Looks like it’s not currently supported; see http://typescript.codeplex.com/discussions/403971