The type definitions for d3.js 4.x 
- d3-array
- d3-axis
- d3-color
- d3-ease
- d3-hierarchy
- d3-interpolate
- d3-path
- d3-polygon
- d3-scale
- d3-selection
- d3-shape
- d3-transition
NPM based declarations for Typescript 2.0
This declarations will move to npm @types/d3v4.
But, It need Typescript 2.0 and newest IDEs. (ex. Webstorm 2016.2)
https://github.com/iamssen/typings-d3/tree/types
