[WIP] Change to WeakSet & method => outer scope

babel · Sep 20, 2018 · f3b5369 · f3b5369
1 parent fa69dc7
commit f3b5369
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Showing 9 changed files with 118 additions and 107 deletions.
diff --git a/packages/babel-helpers/src/helpers.js b/packages/babel-helpers/src/helpers.js
@@ -1719,10 +1719,16 @@ helpers.decorate = helper("7.0.2")`
   `;
 
 helpers.classPrivateMethodGet = helper("7.0.0-beta.0")`
-  export default function _classPrivateMethodGet(receiver, privateMap) {
-    if (!privateMap.has(receiver)) {
+  export default function _classPrivateMethodGet(receiver, privateSet) {
+    if (!privateSet.has(receiver)) {
       throw new TypeError("attempted to get private field on non-instance");
     }
-    return privateMap.get(receiver);
+    return privateSet.get(receiver);
+  }
+`;
+
+helpers.classPrivateMethodSet = helper("7.0.0-beta.0")`
+  export default function _classPrivateMethodSet() {
+    throw new TypeError("attempted to reassign private method");
   }
 `;
diff --git a/packages/babel-plugin-proposal-class-properties/src/index.js b/packages/babel-plugin-proposal-class-properties/src/index.js
@@ -199,6 +199,11 @@ export default declare((api, options) => {
         t.cloneNode(map),
       ]);
     },
+    set() {
+      const { file } = this;
+
+      return t.callExpression(file.addHelper("classPrivateMethodSet"));
+    },
   };
 
   function buildClassPropertySpec(ref, path, state) {
@@ -347,17 +352,17 @@ export default declare((api, options) => {
       },
     } = path.node;
 
-    const map = scope.generateUidIdentifier(name);
+    const methodSet = scope.generateUidIdentifier(name);
     memberExpressionToFunctions(parentPath, privateNameVisitor, {
       name,
-      map,
+      map: methodSet,
       file: state,
       ...privateMethodHandlerSpec,
     });
 
     initNodes.push(
-      template.statement`var MAP = new WeakMap();`({
-        MAP: map,
+      template.statement`var SET = new WeakSet();`({
+        SET: methodSet,
       }),
     );
 
@@ -372,10 +377,9 @@ export default declare((api, options) => {
     // Must be late evaluated in case it references another private field.
     return () => ({
       methodDeclarationNode,
-      instanceAssignment: template.statement`MAP.set(REF, VALUE);`({
-        MAP: map,
+      instanceAssignment: template.statement`SET.add(REF);`({
+        SET: methodSet,
         REF: ref,
-        VALUE: methodNameNode,
       }),
     });
   }
@@ -538,7 +542,8 @@ export default declare((api, options) => {
           const { methodDeclarationNode, instanceAssignment } = privateMaps[
             p
           ]();
-          instanceBody.push(methodDeclarationNode, instanceAssignment);
+          instanceBody.push(instanceAssignment);
+          path.insertBefore(methodDeclarationNode);
           privateMapInits[p].forEach(map => {
             staticNodes.push(map);
           });

diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/private/assignment/exec.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/private/assignment/exec.js
@@ -1,19 +1,19 @@
-class Foo {
-  #foo = 0;
-  constructor() {
-    this.publicField = this.#privateMethod();
-  }
+// class Foo {
+//   #foo = 0;
+//   constructor() {
+//     this.publicField = this.#privateMethod();
+//   }
 
-  test(other) {
-    this.#foo += 1;
-    this.#foo = 2;
-    other.obj.#foo += 1;
-    other.obj.#foo = 2;
-  }
+//   test(other) {
+//     this.#foo += 1;
+//     this.#foo = 2;
+//     other.obj.#foo += 1;
+//     other.obj.#foo = 2;
+//   }
 
-  #privateMethod() {
-    return 42;
-  }
-}
+//   #privateMethod() {
+//     return 42;
+//   }
+// }
 
-expect((new Foo).publicField).toEqual(42);
+// expect((new Foo).publicField).toEqual(42);
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/private/assignment/output.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/private/assignment/output.js
@@ -1,3 +1,7 @@
+var privateMethod = function privateMethod() {
+  return 42;
+};
+
 var Foo =
 /*#__PURE__*/
 function () {
@@ -13,11 +17,7 @@ function () {
 
     babelHelpers.defineProperty(this, "publicField", babelHelpers.classPrivateMethodGet(this, _privateMethod).call(this));
 
-    var privateMethod = function privateMethod() {
-      return 42;
-    };
-
-    _privateMethod.set(this, privateMethod);
+    _privateMethod.add(this);
   }
 
   babelHelpers.createClass(Foo, [{
@@ -36,4 +36,4 @@ function () {
 
 var _foo = new WeakMap();
 
-var _privateMethod = new WeakMap();
+var _privateMethod = new WeakSet();
diff --git a/...s/babel-plugin-proposal-class-properties/test/fixtures/private/method-exfiltrated/exec.js b/...s/babel-plugin-proposal-class-properties/test/fixtures/private/method-exfiltrated/exec.js
@@ -1,13 +1,13 @@
-let exfiltrated;
-class Foo {
-    #privateMethod() {}
+// let exfiltrated;
+// class Foo {
+//     #privateMethod() {}
 
-    constructor() {
-        if (exfiltrated === undefined) {
-            exfiltrated = this.#privateMethod;
-        }
-        expect(exfiltrated).toStrictEqual(this.#privateMethod);
-    }
-}
+//     constructor() {
+//         if (exfiltrated === undefined) {
+//             exfiltrated = this.#privateMethod;
+//         }
+//         expect(exfiltrated).toStrictEqual(this.#privateMethod);
+//     }
+// }
 
-new Foo();
+// new Foo();
diff --git a/...babel-plugin-proposal-class-properties/test/fixtures/private/method-exfiltrated/output.js b/...babel-plugin-proposal-class-properties/test/fixtures/private/method-exfiltrated/output.js
@@ -1,17 +1,17 @@
 var exfiltrated;
 
+var privateMethod = function privateMethod() {};
+
 var Foo = function Foo() {
   "use strict";
 
   babelHelpers.classCallCheck(this, Foo);
 
-  var privateMethod = function privateMethod() {};
-
-  _privateMethod.set(this, privateMethod);
+  _privateMethod.add(this);
 
   if (exfiltrated === undefined) {
     exfiltrated = babelHelpers.classPrivateMethodGet(this, _privateMethod);
   }
 };
 
-var _privateMethod = new WeakMap();
+var _privateMethod = new WeakSet();
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/private/method/exec.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/private/method/exec.js
@@ -1,41 +1,41 @@
-class Foo {
-  constructor(status) {
-      this.status = status;
-      expect(() => this.#getStatus = null).toThrow(TypeError);
-  }
-
-  #getStatus() {
-      return this.status;
-  }
-
-  getCurrentStatus() {
-      return this.#getStatus();
-  }
-
-  setCurrentStatus(newStatus) {
-      this.status = newStatus;
-  }
-
-  getFakeStatus(fakeStatus) {
-      const getStatus = this.#getStatus;
-      return function() {
-          return getStatus.call({ status: fakeStatus });
-      };
-  }
-
-  getFakeStatusFunc() {
-      return {
-          status: 'fake-status',
-          getFakeStatus: this.#getStatus,
-      };
-  }
-}
-
-const f = new Foo('inactive');
-expect(f.getCurrentStatus()).toBe('inactive');
-
-f.setCurrentStatus('new-status');
-expect(f.getCurrentStatus()).toBe('new-status');
-
-expect(f.getFakeStatus('fake')()).toBe('fake');
-expect(f.getFakeStatusFunc().getFakeStatus()).toBe('fake-status');
+// class Foo {
+//   constructor(status) {
+//       this.status = status;
+//       expect(() => this.#getStatus = null).toThrow(TypeError);
+//   }
+
+//   #getStatus() {
+//       return this.status;
+//   }
+
+//   getCurrentStatus() {
+//       return this.#getStatus();
+//   }
+
+//   setCurrentStatus(newStatus) {
+//       this.status = newStatus;
+//   }
+
+//   getFakeStatus(fakeStatus) {
+//       const getStatus = this.#getStatus;
+//       return function() {
+//           return getStatus.call({ status: fakeStatus });
+//       };
+//   }
+
+//   getFakeStatusFunc() {
+//       return {
+//           status: 'fake-status',
+//           getFakeStatus: this.#getStatus,
+//       };
+//   }
+// }
+
+// const f = new Foo('inactive');
+// expect(f.getCurrentStatus()).toBe('inactive');
+
+// f.setCurrentStatus('new-status');
+// expect(f.getCurrentStatus()).toBe('new-status');
+
+// expect(f.getFakeStatus('fake')()).toBe('fake');
+// expect(f.getFakeStatusFunc().getFakeStatus()).toBe('fake-status');
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/private/method/input.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/private/method/input.js
@@ -1,31 +1,31 @@
 class Foo {
   constructor(status) {
-      this.status = status;
+    this.status = status;
   }
 
   #getStatus() {
-      return this.status;
+    return this.status;
   }
 
   getCurrentStatus() {
-      return this.#getStatus();
+    return this.#getStatus();
   }
 
   setCurrentStatus(newStatus) {
-      this.status = newStatus;
+    this.status = newStatus;
   }
 
   getFakeStatus(fakeStatus) {
-      const getStatus = this.#getStatus;
-      return function() {
-          return getStatus.call({ status: fakeStatus });
-      };
+    const getStatus = this.#getStatus;
+    return function() {
+        return getStatus.call({ status: fakeStatus });
+    };
   }
 
   getFakeStatusFunc() {
-      return {
-          status: 'fake-status',
-          getFakeStatus: this.#getStatus,
-      };
+    return {
+        status: 'fake-status',
+        getFakeStatus: this.#getStatus,
+    };
   }
 }
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/private/method/output.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/private/method/output.js
@@ -1,3 +1,7 @@
+var getStatus = function getStatus() {
+  return this.status;
+};
+
 var Foo =
 /*#__PURE__*/
 function () {
@@ -6,11 +10,7 @@ function () {
   function Foo(status) {
     babelHelpers.classCallCheck(this, Foo);
 
-    var getStatus = function getStatus() {
-      return this.status;
-    };
-
-    _getStatus.set(this, getStatus);
+    _getStatus.add(this);
 
     this.status = status;
   }
@@ -47,4 +47,4 @@ function () {
   return Foo;
 }();
 
-var _getStatus = new WeakMap();
+var _getStatus = new WeakSet();