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-proposal-private-methods/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "@babel/plugin-proposal-private-methods",
+  "version": "7.1.0",
+  "description": "This plugin transforms private class methods",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-proposal-private-methods",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "^7.0.0",
+    "@babel/plugin-class-features": "^7.1.4"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.0.0",
+    "@babel/helper-plugin-test-runner": "^7.0.0"
+  }
+}