text: var fs = require("fs"),
      rollup = require("rollup"),
      dependencies = require("./package.json").dependencies;
  
  rollup.rollup({
    input: "index.js",
    external: Object.keys(dependencies)
  }).then(function(bundle) {
    return bundle.generate({format: "cjs"});
  }).then(function(result) {
    var code = result.code + "Object.defineProperty(exports, \"event\", {get: function() { return d3Selection.event; }});\n";
    return new Promise(function(resolve, reject) {
      fs.writeFile("dist/d3.node.js", code, "utf8", function(error) {
        if (error) return reject(error);
        else resolve();
      });
    });
  }).catch(abort);
  
  function abort(error) {
    console.error(error.stack);
  }
  