Fix support for namespaced babel packages (#4918)

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Fixes
 
+* `[babel-jest]` Fix support for namespaced babel version 7
+  ([#4918](https://github.com/facebook/jest/pull/4918))
 * `[expect]` fix .toThrow for promises
   ([#4884](https://github.com/facebook/jest/pull/4884))
 * `[jest-docblock]` pragmas should preserve urls

docs/GettingStarted.md

@@ -81,9 +81,15 @@ To use [Babel](http://babeljs.io/), install the `babel-jest` and
 `regenerator-runtime` packages:
 
 ```
-npm install --save-dev babel-jest regenerator-runtime
+npm install --save-dev babel-jest babel-core regenerator-runtime
 ```
 
+> Note: If you are using a babel version 7 then you need to install `babel-jest`
+> with the following command:
+> ```
+> npm install --save-dev babel-jest babel-core@^7.0.0-0 @babel/core regenerator-runtime
+> ```
+
 _Note: Explicitly installing `regenerator-runtime` is not needed if you use
 `npm` 3 or 4 or Yarn_
 

packages/babel-jest/README.md

@@ -9,9 +9,14 @@ If you are already using `jest-cli`, just add `babel-jest` and it will
 automatically compile JavaScript code using babel.
 
 ```
-npm install --save-dev babel-jest
+npm install --save-dev babel-jest babel-core
 ```
 
+> Note: If you are using babel version 7 you have to install `babel-jest` with
+> ```
+> npm install --save-dev babel-jest babel-core@^7.0.0-0 @babel/core
+> ```
+
 If you would like to write your own preprocessor, uninstall and delete
 babel-jest and set the
 [config.transform](http://facebook.github.io/jest/docs/configuration.html#transform-object-string-string)

packages/babel-jest/package.json

@@ -16,6 +16,6 @@
     "babel-core": "^6.0.0"
   },
   "peerDependencies": {
-    "babel-core": "^6.0.0 || ^7.0.0-alpha || ^7.0.0-beta || ^7.0.0"
+    "babel-core": "^6.0.0 || ^7.0.0-0"
   }
 }