Feature request: Adding XMLHttpRequest support to the Node.js version

[chumo]

I noticed that d3.xhr and its convenient methods (like d3.json) do not work in Node.js due to a lack of an implemented XMLHttpRequest there. Wouldn't it be easy enough to add a dependency to the xmlhttprequest npm package? This way the Node version would work as well as the browser version by adding:

var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;

[mbostock]

I’ve opened d3/d3-request#8 as a request for the d3-request module in 4.0. I’m all for this, although I don’t yet know how to express this optional dependency in conjunction with Rollup so that the require only happens in a Node environment (and not, for example, in Browserify consuming the CommonJS / UMD bundle). One possibility is a wrapper script as the main entry in the package.json, and then a separate Browserify entry, but then the wrapper has to expose the XMLHttpRequest symbol globally… so, blech.

[mbostock]

d3-request now supports Node in 0.4.3.