Trying to figure out transform-builtin-extend, transform-runtime, etc.

.babelrc

{
  "env": {
    "development": {
      "plugins": [
        ["transform-builtin-extend", {
          "globals": ["Error"]
        }],
        "transform-runtime",
        "transform-es2015-classes",
        "transform-es2015-modules-commonjs"
      ]
    }
  }
}

compiled-index.js

"use strict";

var _create = require("babel-runtime/core-js/object/create");

var _create2 = _interopRequireDefault(_create);

var _setPrototypeOf = require("babel-runtime/core-js/object/set-prototype-of");

var _setPrototypeOf2 = _interopRequireDefault(_setPrototypeOf);

var _from = require("babel-runtime/core-js/array/from");

var _from2 = _interopRequireDefault(_from);

var _construct = require("babel-runtime/core-js/reflect/construct");

var _construct2 = _interopRequireDefault(_construct);

var _getPrototypeOf = require("babel-runtime/core-js/object/get-prototype-of");

var _getPrototypeOf2 = _interopRequireDefault(_getPrototypeOf);

var _classCallCheck2 = require("babel-runtime/helpers/classCallCheck");

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _possibleConstructorReturn2 = require("babel-runtime/helpers/possibleConstructorReturn");

var _possibleConstructorReturn3 = _interopRequireDefault(_possibleConstructorReturn2);

var _inherits2 = require("babel-runtime/helpers/inherits");

var _inherits3 = _interopRequireDefault(_inherits2);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _extendableBuiltin3(cls) {
  function ExtendableBuiltin() {
    var instance = _Reflect$construct(cls, _Array$from(arguments));

    _Object$setPrototypeOf(instance, _Object$getPrototypeOf(this));

    return instance;
  }

  ExtendableBuiltin.prototype = _Object$create(cls.prototype, {
    constructor: {
      value: cls,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });

  if (_Object$setPrototypeOf) {
    _Object$setPrototypeOf(ExtendableBuiltin, cls);
  } else {
    ExtendableBuiltin.__proto__ = cls;
  }

  return ExtendableBuiltin;
}

function _extendableBuiltin(cls) {
  function ExtendableBuiltin() {
    var instance = (0, _construct2.default)(cls, (0, _from2.default)(arguments));
    (0, _setPrototypeOf2.default)(instance, (0, _getPrototypeOf2.default)(this));
    return instance;
  }

  ExtendableBuiltin.prototype = (0, _create2.default)(cls.prototype, {
    constructor: {
      value: cls,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });

  if (_setPrototypeOf2.default) {
    (0, _setPrototypeOf2.default)(ExtendableBuiltin, cls);
  } else {
    ExtendableBuiltin.__proto__ = cls;
  }

  return ExtendableBuiltin;
}

var Error1 = function (_extendableBuiltin2) {
  (0, _inherits3.default)(Error1, _extendableBuiltin2);

  function Error1() {
    (0, _classCallCheck3.default)(this, Error1);
    return (0, _possibleConstructorReturn3.default)(this, (Error1.__proto__ || (0, _getPrototypeOf2.default)(Error1)).apply(this, arguments));
  }

  return Error1;
}(_extendableBuiltin(Error));

var Error2 = function (_extendableBuiltin4) {
  (0, _inherits3.default)(Error2, _extendableBuiltin4);

  function Error2() {
    (0, _classCallCheck3.default)(this, Error2);
    return (0, _possibleConstructorReturn3.default)(this, (Error2.__proto__ || (0, _getPrototypeOf2.default)(Error2)).apply(this, arguments));
  }

  return Error2;
}(_extendableBuiltin3(Error));

index.js

class Error1 extends Error {}
class Error2 extends Error {}

npm list.output

├─┬ babel-cli@6.26.0
│ ├─┬ babel-polyfill@6.26.0
│ │ └── regenerator-runtime@0.10.5
│ ├─┬ babel-register@6.26.0
│ │ ├─┬ home-or-tmp@2.0.0
│ │ │ ├── os-homedir@1.0.2
│ │ │ └── os-tmpdir@1.0.2
│ │ ├─┬ mkdirp@0.5.1
│ │ │ └── minimist@0.0.8
│ │ └── source-map-support@0.4.18
│ ├─┬ chokidar@1.7.0
│ │ ├─┬ anymatch@1.3.2
│ │ │ ├─┬ micromatch@2.3.11
│ │ │ │ ├─┬ arr-diff@2.0.0
│ │ │ │ │ └── arr-flatten@1.1.0
│ │ │ │ ├── array-unique@0.2.1
│ │ │ │ ├─┬ braces@1.8.5
│ │ │ │ │ ├─┬ expand-range@1.8.2
│ │ │ │ │ │ └─┬ fill-range@2.2.3
│ │ │ │ │ │   ├── is-number@2.1.0
│ │ │ │ │ │   ├── isobject@2.1.0
│ │ │ │ │ │   ├─┬ randomatic@1.1.7
│ │ │ │ │ │   │ ├─┬ is-number@3.0.0
│ │ │ │ │ │   │ │ └── kind-of@3.2.2
│ │ │ │ │ │   │ └── kind-of@4.0.0
│ │ │ │ │ │   └── repeat-string@1.6.1
│ │ │ │ │ ├── preserve@0.2.0
│ │ │ │ │ └── repeat-element@1.1.2
│ │ │ │ ├─┬ expand-brackets@0.1.5
│ │ │ │ │ └── is-posix-bracket@0.1.1
│ │ │ │ ├── extglob@0.3.2
│ │ │ │ ├── filename-regex@2.0.1
│ │ │ │ ├─┬ kind-of@3.2.2
│ │ │ │ │ └── is-buffer@1.1.6
│ │ │ │ ├─┬ object.omit@2.0.1
│ │ │ │ │ ├─┬ for-own@0.1.5
│ │ │ │ │ │ └── for-in@1.0.2
│ │ │ │ │ └── is-extendable@0.1.1
│ │ │ │ ├─┬ parse-glob@3.0.4
│ │ │ │ │ ├── glob-base@0.3.0
│ │ │ │ │ └── is-dotfile@1.0.3
│ │ │ │ └─┬ regex-cache@0.4.4
│ │ │ │   └─┬ is-equal-shallow@0.1.3
│ │ │ │     └── is-primitive@2.0.0
│ │ │ └─┬ normalize-path@2.1.1
│ │ │   └── remove-trailing-separator@1.1.0
│ │ ├── async-each@1.0.1
│ │ ├── UNMET OPTIONAL DEPENDENCY fsevents@^1.0.0
│ │ ├── glob-parent@2.0.0
│ │ ├── inherits@2.0.3
│ │ ├─┬ is-binary-path@1.0.1
│ │ │ └── binary-extensions@1.10.0
│ │ ├─┬ is-glob@2.0.1
│ │ │ └── is-extglob@1.0.0
│ │ └─┬ readdirp@2.1.0
│ │   ├─┬ readable-stream@2.3.3
│ │   │ ├── core-util-is@1.0.2
│ │   │ ├── isarray@1.0.0
│ │   │ ├── process-nextick-args@1.0.7
│ │   │ ├── safe-buffer@5.1.1
│ │   │ ├── string_decoder@1.0.3
│ │   │ └── util-deprecate@1.0.2
│ │   └── set-immediate-shim@1.0.1
│ ├── commander@2.11.0
│ ├── convert-source-map@1.5.0
│ ├── fs-readdir-recursive@1.1.0
│ ├─┬ glob@7.1.2
│ │ ├── fs.realpath@1.0.0
│ │ ├─┬ inflight@1.0.6
│ │ │ └── wrappy@1.0.2
│ │ └── once@1.4.0
│ ├── lodash@4.17.4
│ ├─┬ output-file-sync@1.1.2
│ │ ├── graceful-fs@4.1.11
│ │ └── object-assign@4.1.1
│ ├── path-is-absolute@1.0.1
│ ├── slash@1.0.0
│ ├── source-map@0.5.7
│ └─┬ v8flags@2.1.1
│   └── user-home@1.1.1
├─┬ babel-core@6.26.0
│ ├─┬ babel-code-frame@6.26.0
│ │ ├─┬ chalk@1.1.3
│ │ │ ├── ansi-styles@2.2.1
│ │ │ ├── escape-string-regexp@1.0.5
│ │ │ ├─┬ has-ansi@2.0.0
│ │ │ │ └── ansi-regex@2.1.1
│ │ │ ├── strip-ansi@3.0.1
│ │ │ └── supports-color@2.0.0
│ │ ├── esutils@2.0.2
│ │ └── js-tokens@3.0.2
│ ├─┬ babel-generator@6.26.0
│ │ ├─┬ detect-indent@4.0.0
│ │ │ └─┬ repeating@2.0.1
│ │ │   └─┬ is-finite@1.0.2
│ │ │     └── number-is-nan@1.0.1
│ │ ├── jsesc@1.3.0
│ │ └── trim-right@1.0.1
│ ├── babel-helpers@6.24.1
│ ├── babel-messages@6.23.0
│ ├── babel-template@6.26.0
│ ├─┬ babel-traverse@6.26.0
│ │ ├── globals@9.18.0
│ │ └─┬ invariant@2.2.2
│ │   └── loose-envify@1.3.1
│ ├─┬ babel-types@6.26.0
│ │ └── to-fast-properties@1.0.3
│ ├── babylon@6.18.0
│ ├─┬ debug@2.6.9
│ │ └── ms@2.0.0
│ ├── json5@0.5.1
│ ├─┬ minimatch@3.0.4
│ │ └─┬ brace-expansion@1.1.8
│ │   ├── balanced-match@1.0.0
│ │   └── concat-map@0.0.1
│ └── private@0.1.8
├── babel-plugin-transform-builtin-extend@1.1.2
├── babel-plugin-transform-runtime@6.23.0
├─┬ babel-preset-es2015@6.24.1
│ ├── babel-plugin-check-es2015-constants@6.22.0
│ ├── babel-plugin-transform-es2015-arrow-functions@6.22.0
│ ├── babel-plugin-transform-es2015-block-scoped-functions@6.22.0
│ ├── babel-plugin-transform-es2015-block-scoping@6.26.0
│ ├─┬ babel-plugin-transform-es2015-classes@6.24.1
│ │ ├── babel-helper-define-map@6.26.0
│ │ ├── babel-helper-function-name@6.24.1
│ │ ├── babel-helper-optimise-call-expression@6.24.1
│ │ └── babel-helper-replace-supers@6.24.1
│ ├── babel-plugin-transform-es2015-computed-properties@6.24.1
│ ├── babel-plugin-transform-es2015-destructuring@6.23.0
│ ├── babel-plugin-transform-es2015-duplicate-keys@6.24.1
│ ├── babel-plugin-transform-es2015-for-of@6.23.0
│ ├── babel-plugin-transform-es2015-function-name@6.24.1
│ ├── babel-plugin-transform-es2015-literals@6.22.0
│ ├── babel-plugin-transform-es2015-modules-amd@6.24.1
│ ├─┬ babel-plugin-transform-es2015-modules-commonjs@6.26.0
│ │ └── babel-plugin-transform-strict-mode@6.24.1
│ ├─┬ babel-plugin-transform-es2015-modules-systemjs@6.24.1
│ │ └── babel-helper-hoist-variables@6.24.1
│ ├── babel-plugin-transform-es2015-modules-umd@6.24.1
│ ├── babel-plugin-transform-es2015-object-super@6.24.1
│ ├─┬ babel-plugin-transform-es2015-parameters@6.24.1
│ │ ├── babel-helper-call-delegate@6.24.1
│ │ └── babel-helper-get-function-arity@6.24.1
│ ├── babel-plugin-transform-es2015-shorthand-properties@6.24.1
│ ├── babel-plugin-transform-es2015-spread@6.22.0
│ ├─┬ babel-plugin-transform-es2015-sticky-regex@6.24.1
│ │ └── babel-helper-regex@6.26.0
│ ├── babel-plugin-transform-es2015-template-literals@6.22.0
│ ├── babel-plugin-transform-es2015-typeof-symbol@6.23.0
│ ├─┬ babel-plugin-transform-es2015-unicode-regex@6.24.1
│ │ └─┬ regexpu-core@2.0.0
│ │   ├── regenerate@1.3.3
│ │   ├── regjsgen@0.2.0
│ │   └─┬ regjsparser@0.1.5
│ │     └── jsesc@0.5.0
│ └─┬ babel-plugin-transform-regenerator@6.26.0
│   └── regenerator-transform@0.10.1
└─┬ babel-runtime@6.26.0
  ├── core-js@2.5.1
  └── regenerator-runtime@0.11.0

package.json

{
  "name": "ethan-test-core-js",
  "version": "0.0.1",
  "description": "Ethan is trying to understand how these transforms work",
  "main": "lib/index.js",
  "scripts": {
    "build": "babel -d lib/ index.js"
  },
  "dependencies": {
    "babel-runtime": "^6.22.0"
  },
  "devDependencies": {
    "babel-cli": "^6.22.2",
    "babel-core": "^6.26.0",
    "babel-plugin-transform-builtin-extend": "^1.1.2",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-es2015": "^6.24.1"
  },
  "engines": {
    "node": ">=6"
  }
}