Update babylon beta 3 (#5394)

* Update babylon to v7-beta.3

* convert RestProperty/SpreadProperty to RestElement/SpreadElement

* add virtual types to make it easier to upgrade

packages/babel-types/src/definitions/core.js

@@ -470,7 +470,7 @@ defineType("ObjectExpression", {
     properties: {
       validate: chain(
         assertValueType("array"),
-        assertEach(assertNodeType("ObjectMethod", "ObjectProperty", "SpreadProperty"))
+        assertEach(assertNodeType("ObjectMethod", "ObjectProperty", "SpreadElement"))
       )
     }
   }

packages/babel-types/src/definitions/es2015.js

@@ -298,7 +298,7 @@ defineType("ObjectPattern", {
   aliases: ["Pattern", "LVal"],
   fields: {
     properties: {
-      validate: chain(assertValueType("array"), assertEach(assertNodeType("RestProperty", "Property")))
+      validate: chain(assertValueType("array"), assertEach(assertNodeType("RestElement", "Property")))
     },
     decorators: {
       validate: chain(assertValueType("array"), assertEach(assertNodeType("Decorator")))

packages/babel-types/src/definitions/experimental.js

@@ -61,23 +61,3 @@ defineType("ExportNamespaceSpecifier", {
     }
   }
 });
-
-defineType("RestProperty", {
-  visitor: ["argument"],
-  aliases: ["UnaryLike"],
-  fields: {
-    argument: {
-      validate: assertNodeType("LVal")
-    }
-  }
-});
-
-defineType("SpreadProperty", {
-  visitor: ["argument"],
-  aliases: ["UnaryLike"],
-  fields: {
-    argument: {
-      validate: assertNodeType("Expression")
-    }
-  }
-});

packages/babel-types/src/retrievers.js

@@ -94,7 +94,6 @@ getBindingIdentifiers.keys = {
   RestElement: ["argument"],
   UpdateExpression: ["argument"],
 
-  RestProperty: ["argument"],
   ObjectProperty: ["value"],
 
   AssignmentPattern: ["left"],