Support private properties in no-invalid-this (babel/eslint-plugin-babel#183)

* add failing test

* support ClassPrivateProperty

eslint/babel-eslint-plugin/rules/no-invalid-this.js

@@ -11,7 +11,8 @@ module.exports = ruleComposer.filterReports(
         let node = problem.node;
 
         while (node) {
-            if (node.type === "ClassProperty") {
+            if (node.type === "ClassProperty" ||
+                node.type === "ClassPrivateProperty") {
                 inClassProperty = true;
                 return;
             }

eslint/babel-eslint-plugin/tests/rules/no-invalid-this.js

@@ -602,6 +602,21 @@ const patterns = [
         valid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
         invalid: []
     },
+
+    // Class Private Instance Properties.
+    {
+        code: "class A {#a = this.b;};",
+        parserOptions: { ecmaVersion: 6 },
+        valid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
+        invalid: []
+    },
+
+    {
+        code: "class A {#a = () => {return this.b;};};",
+        parserOptions: { ecmaVersion: 6 },
+        valid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
+        invalid: []
+    },
 ];
 
 const ruleTester = new RuleTester();