Browserify vs. Splittable tree-shaking

.babelrc

{"presets": ["es2015", "stage-0"]}

browserify.js

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
'use strict';

var _package = require('./package.json');

console.log(_package.version);

},{"./package.json":2}],2:[function(require,module,exports){
module.exports={
  "name": "minjs",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "time": "time npm run browserify; time npm run splittable",
    "browserify": "browserify --debug -t babelify bundle.js | exorcist browserify.js.map > browserify.js",
    "splittable": "splittable --write-to split bundle.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "babel-cli": "^6.18.0",
    "babel-preset-es2015": "^6.18.0",
    "babel-preset-stage-0": "^6.16.0",
    "babelify": "^7.3.0",
    "browserify": "^13.1.1",
    "exorcist": "^0.4.0",
    "splittable": "^3.0.1",
    "uglify-js": "^2.7.5"
  }
}

},{}]},{},[1])
//# sourceMappingURL=browserify.js.map

browserify.js.map

{
  "version": 3,
  "sources": [
    "node_modules/browser-pack/_prelude.js",
    "bundle.js",
    "package.json"
  ],
  "names": [],
  "mappings": "AAAA;;;ACAA;;AACA,QAAQ,GAAR;;;ACDA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA",
  "file": "generated.js",
  "sourceRoot": "",
  "sourcesContent": [
    "(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})",
    "import {version} from './package.json';\nconsole.log(version);\n",
    "module.exports={\n  \"name\": \"minjs\",\n  \"version\": \"1.0.0\",\n  \"description\": \"\",\n  \"main\": \"index.js\",\n  \"scripts\": {\n    \"time\": \"time npm run browserify; time npm run splittable\",\n    \"browserify\": \"browserify --debug -t babelify bundle.js | exorcist browserify.js.map > browserify.js\",\n    \"splittable\": \"splittable --write-to split bundle.js\"\n  },\n  \"keywords\": [],\n  \"author\": \"\",\n  \"license\": \"ISC\",\n  \"dependencies\": {\n    \"babel-cli\": \"^6.18.0\",\n    \"babel-preset-es2015\": \"^6.18.0\",\n    \"babel-preset-stage-0\": \"^6.16.0\",\n    \"babelify\": \"^7.3.0\",\n    \"browserify\": \"^13.1.1\",\n    \"exorcist\": \"^0.4.0\",\n    \"splittable\": \"^3.0.1\",\n    \"uglify-js\": \"^2.7.5\"\n  }\n}\n"
  ]
}

bundle.js

import {version} from './package.json';
console.log(version);

package.json

{
  "name": "minjs",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "time": "time npm run browserify; time npm run splittable",
    "browserify": "browserify --debug -t babelify bundle.js | exorcist browserify.js.map > browserify.js",
    "splittable": "splittable --write-to split bundle.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "babel-cli": "^6.18.0",
    "babel-preset-es2015": "^6.18.0",
    "babel-preset-stage-0": "^6.16.0",
    "babelify": "^7.3.0",
    "browserify": "^13.1.1",
    "exorcist": "^0.4.0",
    "splittable": "^3.0.1",
    "uglify-js": "^2.7.5"
  }
}

splitbundle.js

self.global=self;console.log("1.0.0");
//# sourceMappingURL=splitbundle.js.map

splitbundle.js.map

{
"version":3,
"file":"/splitbundle.js",
"lineCount":1,
"mappings":"A,iBACAA,OAAAC,IAAA,CCCaC,ODDb;",
"sources":["/bundle.js","/package.json"],
"names":["console","log","module$package_json.version"]
}