Split @babel/runtime into two separate runtime modules.

packages/babel-runtime/README.md

@@ -1,6 +1,6 @@
 # @babel/runtime
 
-> babel selfContained runtime
+> babel's modular runtime helpers
 
 See our website [@babel/runtime](https://babeljs.io/docs/en/next/babel-runtime.html) for more information.
 

packages/babel-runtime/core-js.js

@@ -1 +0,0 @@
-module.exports = require("core-js/library");

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

@@ -1 +0,0 @@
-module.exports = require("core-js/library/fn/map");

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

@@ -1,5 +0,0 @@
-function _iterableToArray(iter) {
-  if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
-}
-
-module.exports = _iterableToArray;

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

@@ -1,11 +0,0 @@
-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/helpers/builtin/toArray.js

@@ -1,11 +0,0 @@
-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/helpers/es6/iterableToArray.js

@@ -1,5 +0,0 @@
-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/helpers/es6/temporalRef.js

@@ -1,8 +0,0 @@
-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/helpers/es6/toArray.js

@@ -1,6 +0,0 @@
-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/helpers/iterableToArray.js

@@ -1,9 +1,5 @@
-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);
+  if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
 }
 
 module.exports = _iterableToArray;

packages/babel-runtime/package.json

@@ -1,12 +1,11 @@
 {
   "name": "@babel/runtime",
   "version": "7.0.0-beta.55",
-  "description": "babel selfContained runtime",
+  "description": "babel's modular runtime helpers",
   "license": "MIT",
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-runtime",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "dependencies": {
-    "core-js": "^2.5.7",
     "regenerator-runtime": "^0.12.0"
   }
 }