Private class methods stage 3 (#8654)

* Add private method syntax support

* Add private method spec support

* Add private method loose support

* Throw error if static private method is used

* Add more isStatic & isMethod checks

* Remove `writable:false` from private method inits

`writable` is false by default.

* Add private method func obj equality check

* Throw if private accessor is used

* Add check for fields === private method loose mode

* Throw buildCodeFrameErrors instead of Errors

* Move obj destructuring inside for loop

* Remove "computed" from ClassPrivateMethod type def

packages/babel-plugin-syntax-class-properties/src/index.js

@@ -7,7 +7,11 @@ export default declare(api => {
     name: "syntax-class-properties",
 
     manipulateOptions(opts, parserOpts) {
-      parserOpts.plugins.push("classProperties", "classPrivateProperties");
+      parserOpts.plugins.push(
+        "classProperties",
+        "classPrivateProperties",
+        "classPrivateMethods",
+      );
     },
   };
 });