I've installed big.js via npm and the d.ts file viatsd. I am attempting to import it in NodeJS via:
import Big = require('big.js'), as I have done with other modules (e.g., import _ = require('lodash')).

However, I receive the following error upon compilation:
error TS2307: Cannot find external module 'big.js'

In case it matters, I'm using TypeScript 1.3. Also, I am using the typings reference in the file:
/// <reference path="../typings/tsd.d.ts" />