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-core/test/api.js

@@ -480,7 +480,7 @@ describe("api", function() {
     }).then(function(result) {
       assert.equal(
         result.code,
-        "/*before*/start;\n/*after*/class Foo {}\n/*before*/end;\n/*after*/",
+        "/*before*/\nstart;\n\n/*after*/\nclass Foo {}\n\n/*before*/\nend;\n\n/*after*/",
       );
     });
   });

packages/babel-core/test/fixtures/transformation/misc/enforce-newline-modules-blacklist/expected.js

@@ -1,3 +1,2 @@
 export function foo() {}
-
-export function bar() {}
+export function bar() {}

packages/babel-core/test/fixtures/transformation/misc/regression-1155/expected.js

@@ -3,13 +3,14 @@ var Foo = function (_Bar) {
 
   function Foo(options) {
     babelHelpers.classCallCheck(this, Foo);
-
     var parentOptions = {};
+
     parentOptions.init = function () {
       this;
     };
+
     return babelHelpers.possibleConstructorReturn(this, (Foo.__proto__ || Object.getPrototypeOf(Foo)).call(this, parentOptions));
   }
 
   return Foo;
-}(Bar);
+}(Bar);

packages/babel-core/test/fixtures/transformation/misc/regression-1168/expected.js

@@ -1,5 +1,4 @@
 function test() {
   var x = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : "hi";
-
   return x;
 }

packages/babel-core/test/fixtures/transformation/misc/regression-1169/expected.js

@@ -9,4 +9,4 @@ function foo() {
   }
 
   return output;
-}
+}

packages/babel-core/test/fixtures/transformation/misc/regression-2765/expected.js

@@ -10,7 +10,9 @@ function f() {
       return _ref.apply(this, arguments);
     };
   }();
-};
+}
+
+;
 
 class Class {
   m() {
@@ -28,4 +30,5 @@ class Class {
       }();
     })();
   }
-}
+
+}

packages/babel-core/test/fixtures/transformation/misc/regression-4855/expected.js

@@ -3,5 +3,4 @@
 var _values = values;
 value = _values[fieldName];
 rest = babelHelpers.objectWithoutProperties(_values, [fieldName]);
-
 var error = void 0;

packages/babel-core/test/fixtures/transformation/misc/shebang/expected.js

@@ -1,4 +1,2 @@
 #!/usr/bin/env node
-
-
-foobar();
+foobar();