Remove whitespace generation (#5833)

* Remove whitespace generation and rely on default printing

Changes to printing:
* Add newline after last empty SwitchCase
* Add newlines around block comments if they are non-flow comments or contain newlines

* Fix a few more fixtures

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/append-to-end-when-declared-in-scope-2/expected.js

@@ -13,4 +13,5 @@ export default class App extends React.Component {
   render() {
     return _ref2;
   }
-}
+
+}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/append-to-end-when-declared-in-scope-3/expected.js

@@ -7,6 +7,7 @@ var _ref3 = <p>Parent</p>;
     render() {
       return _ref;
     }
+
   }
 
   const AppItem = () => {

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/append-to-end-when-declared-in-scope-4/expected.js

@@ -16,5 +16,6 @@ var _ref3 = <p>Parent</p>;
     render() {
       return _ref2;
     }
+
   }
-});
+});

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/append-to-end-when-declared-in-scope/expected.js

@@ -2,6 +2,7 @@ export default class App extends React.Component {
   render() {
     return _ref;
   }
+
 }
 
 var _ref2 = <div>child</div>;

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/async-function/expected.js

@@ -3,11 +3,10 @@ function _asyncToGenerator(fn) { return function () { return new Promise((resolv
 export default {
   function(name) {
     return _asyncToGenerator(function* () {
-      const uppercasedName = name.upperCase();
-
-      // awaits depending on uppercasedName go here
+      const uppercasedName = name.upperCase(); // awaits depending on uppercasedName go here
 
       return <Foo name={uppercasedName} />;
     })();
   }
+
 };

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/class-assign-unreferenced-param-deopt/expected.js

@@ -1,6 +1,4 @@
-import React from 'react';
-
-// Regression test for https://github.com/babel/babel/issues/5552
+import React from 'react'; // Regression test for https://github.com/babel/babel/issues/5552
 
 var _ref = <div />;
 
@@ -8,9 +6,13 @@ class BugReport extends React.Component {
   constructor(...args) {
     var _temp;
 
-    return _temp = super(...args), this.thisWontWork = ({ color }) => data => {
+    return _temp = super(...args), this.thisWontWork = ({
+      color
+    }) => data => {
       return <div color={color}>does not reference data</div>;
-    }, this.thisWorks = ({ color }) => data => {
+    }, this.thisWorks = ({
+      color
+    }) => data => {
       return <div color={color}>{data}</div>;
     }, _temp;
   }
@@ -18,4 +20,5 @@ class BugReport extends React.Component {
   render() {
     return _ref;
   }
+
 }

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/destructure/expected.js

@@ -10,4 +10,5 @@ class AnchorLink extends Component {
 
     return <Link>{children}</Link>;
   }
-}
+
+}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/dont-hoist-before-hoc/expected.js

@@ -11,6 +11,7 @@ var _ref2 = <div className="child">
   </div>;
 
 let Child = () => _ref2;
+
 Child = HOC(Child);
 
 var _ref = <div className="parent">

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/dont-hoist-block-scoped-variables/expected.js

@@ -1,11 +1,9 @@
 function render(flag) {
   if (flag) {
     var bar = "bar";
-
     [].map(() => bar);
-
     return <foo bar={bar} />;
   }
 
   return null;
-}
+}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/param-and-var/expected.js

@@ -1,7 +1,6 @@
 function fn(Component, obj) {
-
   var data = obj.data,
       _ref = <Component prop={data} />;
 
   return () => _ref;
-}
+}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/pure-deopt/expected.js

@@ -1,5 +1,7 @@
 // https://github.com/facebook/react/issues/3226
 // Not safe to reuse because it is mutable
 function render() {
-  return <div style={{ width: 100 }} />;
-}
+  return <div style={{
+    width: 100
+  }} />;
+}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/regression-node-type-export-default/expected.js

@@ -2,6 +2,7 @@ class A {
   render() {
     return _ref;
   }
+
 }
 
 export default class B {}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/regression-node-type-export/expected.js

@@ -2,6 +2,7 @@ class A {
   render() {
     return _ref;
   }
+
 }
 
 export class B {}

packages/babel-plugin-transform-react-constant-elements/test/fixtures/constant-elements/var/expected.js

@@ -1,7 +1,6 @@
 function fn(Component) {
-
   var data = "prop",
       _ref = <Component prop={data} />;
 
   return () => _ref;
-}
+}