Private fields

test/mjsunit/harmony/class-privates-scoping.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-private-class-fields
+
+// this
+{
+  class C {
+    #a = this;
+    a() { return #a; }
+  }
+
+  let c = new C;
+  assertEquals(c, c.a());
+}
+
+// super
+{
+  class Base {
+    m() {
+      return 0;
+    }
+  }
+
+  class Derived extends Base {
+    m() {
+      return 1;
+    }
+    #a = super.m();
+    a() { return #a; }
+  }
+
+  let c = new Derived;
+  assertEquals(0, c.a());
+}
+
+// new.target
+{
+  function outer() {
+    class C {
+      #a = new.target;
+      a() { return #a; }
+    }
+
+    let c = new C;
+    assertEquals(undefined, c.a());
+  }
+
+  new outer;
+}
+
+// arguments
+{
+  function outer() {
+    let stored_outer = arguments;
+    let stored_ctor;
+
+    class C {
+      #a = arguments;
+      a() { return #a; }
+
+      constructor() {
+        stored_ctor = arguments;
+      }
+    }
+
+    let c = new C;
+    assertEquals('[object Arguments]', Object.prototype.toString.call(c.a()));
+    assertFalse(stored_outer === c.a());
+    assertFalse(stored_ctor === c.a());
+  }
+
+  outer();
+}
+
+// ctor params
+{
+  let b = 0;
+  class C {
+    #a = b;
+    a() { return #a; }
+
+    constructor(b) {}
+  }
+
+  let c = new C(1);
+  assertEquals(0, c.a());
+}
+
+// class declaration name
+{
+  class C {
+    #a = C;
+    a() { return #a; }
+  }
+  let stored_class = C;
+  C = null;
+
+  let c = new stored_class;
+  assertEquals(stored_class, c.a());
+}
+
+// class expression name
+{
+  let C = null;
+  let stored_class = class C {
+    #a = C;
+    a() { return #a; }
+  }
+
+  let c = new stored_class;
+  assertEquals(stored_class, c.a());
+}