Split @babel/runtime into two separate runtime modules.

packages/babel-runtime-corejs2/.npmignore

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+src
+test
+*.log

packages/babel-runtime-corejs2/README.md

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+# @babel/runtime-corejs2
+
+> babel's modular runtime helpers with core-js@2 polyfilling
+
+See our website [@babel/runtime-corejs2](https://babeljs.io/docs/en/next/babel-runtime-corejs2.html) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/runtime-corejs2
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/runtime-corejs2 --dev
+```

packages/babel-runtime-corejs2/core-js/map.js

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+module.exports = require("core-js/library/fn/map");

packages/babel-runtime-corejs2/helpers/esm/iterableToArray.js

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+import _Array$from from "../../core-js/array/from";
+import _isIterable from "../../core-js/is-iterable";
+export default function _iterableToArray(iter) {
+  if (_isIterable(Object(iter)) || Object.prototype.toString.call(iter) === "[object Arguments]") return _Array$from(iter);
+}

packages/babel-runtime-corejs2/helpers/esm/temporalRef.js

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+import undef from "./temporalUndefined";
+export default function _temporalRef(val, name) {
+  if (val === undef) {
+    throw new ReferenceError(name + " is not defined - temporal dead zone");
+  } else {
+    return val;
+  }
+}

packages/babel-runtime-corejs2/helpers/esm/toArray.js

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+import arrayWithHoles from "./arrayWithHoles";
+import iterableToArray from "./iterableToArray";
+import nonIterableRest from "./nonIterableRest";
+export default function _toArray(arr) {
+  return arrayWithHoles(arr) || iterableToArray(arr) || nonIterableRest();
+}

packages/babel-runtime-corejs2/helpers/iterableToArray.js

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+var _Array$from = require("../core-js/array/from");
+
+var _isIterable = require("../core-js/is-iterable");
+
+function _iterableToArray(iter) {
+  if (_isIterable(Object(iter)) || Object.prototype.toString.call(iter) === "[object Arguments]") return _Array$from(iter);
+}
+
+module.exports = _iterableToArray;

packages/babel-runtime-corejs2/helpers/temporalRef.js

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+var temporalUndefined = require("./temporalUndefined");
+
+function _temporalRef(val, name) {
+  if (val === temporalUndefined) {
+    throw new ReferenceError(name + " is not defined - temporal dead zone");
+  } else {
+    return val;
+  }
+}
+
+module.exports = _temporalRef;

packages/babel-runtime-corejs2/helpers/toArray.js

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+var arrayWithHoles = require("./arrayWithHoles");
+
+var iterableToArray = require("./iterableToArray");
+
+var nonIterableRest = require("./nonIterableRest");
+
+function _toArray(arr) {
+  return arrayWithHoles(arr) || iterableToArray(arr) || nonIterableRest();
+}
+
+module.exports = _toArray;

packages/babel-runtime-corejs2/package.json

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+{
+  "name": "@babel/runtime-corejs2",
+  "version": "7.0.0-beta.51",
+  "description": "babel's modular runtime helpers with core-js@2 polyfilling",
+  "license": "MIT",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-runtime-corejs2",
+  "author": "Sebastian McKenzie <sebmck@gmail.com>",
+  "dependencies": {
+    "core-js": "^2.5.7",
+    "regenerator-runtime": "^0.12.0"
+  }
+}

packages/babel-runtime-corejs2/regenerator/index.js

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+module.exports = require("regenerator-runtime");