make super behaviour more spec compliant - fixes #32

lib/6to5/templates/class-super-constructor-call.js

@@ -0,0 +1,2 @@
+SUPER_NAME.call(this, arguments);
+

lib/6to5/transformers/classes.js

@@ -71,18 +71,22 @@ var buildClass = function (node, generateUid) {
 
 var buildClassBody = function (body, className, superName, node) {
   var instanceMutatorMap = {};
-  var staticMutatorMap = {};
+  var staticMutatorMap   = {};
+  var hasConstructor     = false;
 
+  var construct = body[0];
   var classBody = node.body.body;
+
   _.each(classBody, function (node) {
     var methodName = node.key.name;
     var method     = node.value;
 
-    replaceInstanceSuperReferences(superName, method);
+    replaceInstanceSuperReferences(superName, method, methodName);
 
     if (methodName === "constructor") {
       if (node.kind === "") {
-        addConstructor(body[0], method);
+        hasConstructor = true;
+        addConstructor(construct, method);
       } else {
         throw util.errorWithNode(node, "unknown kind for constructor method");
       }
@@ -103,6 +107,12 @@ var buildClassBody = function (body, className, superName, node) {
     }
   });
 
+  if (!hasConstructor && superName) {
+    construct.body.body.push(util.template("class-super-constructor-call", {
+      SUPER_NAME: superName
+    }, true));
+  }
+
   if (!_.isEmpty(instanceMutatorMap)) {
     var protoId = util.template("prototype-identifier", {
       CLASS_NAME: className
@@ -116,51 +126,46 @@ var buildClassBody = function (body, className, superName, node) {
   }
 };
 
-var superIdentifier = function (superName, node, parent) {
+var superIdentifier = function (superName, methodName, node, parent) {
   if (parent.property === node) return;
 
   node.name = superName.name || superName.value;
 
-  // super(); -> ClassName.call(this);
+  // super(); -> ClassName.prototype.MethodName.call(this);
   if (parent.type === "CallExpression" && parent.callee === node) {
-    node.name += ".call";
+    if (methodName === "constructor") {
+      // constructor() { super(); }
+      node.name += ".call";
+    } else {
+      // foo() { super(); }
+      node.name += ".prototype." + methodName + ".call";
+    }
+
     parent.arguments.unshift(b.thisExpression());
+  } else if (parent.type === "MemberExpression") {
+    // super.test -> ClassName.prototype.test
+    node.name += ".prototype";
   }
 };
 
-var replaceInstanceSuperReferences = function (superName, method) {
+var replaceInstanceSuperReferences = function (superName, method, methodName) {
   superName = superName || b.literal("Function");
 
   traverse(method, function (node, parent) {
     if (node.type === "Identifier" && node.name === "super") {
-      superIdentifier(superName, node, parent);
+      superIdentifier(superName, methodName, node, parent);
-    } else if (node.type === "MemberExpression") {
-      // no accessing of super properties
-
-      if (isAccessingSuperProperties(parent, node)) {
-        throw util.errorWithNode(node, "cannot access super properties");
-      } else {
-        return;
-      }
     } else if (node.type === "CallExpression") {
       var callee = node.callee;
       if (callee.type !== "MemberExpression") return;
       if (callee.object.name !== "super") return;
 
-      callee.property.name = "prototype." + callee.property.name + ".call";
+      //  super.test(); -> Classname.prototype.MethodName.call(this);
+      callee.property.name = callee.property.name + ".call";
       node.arguments.unshift(b.thisExpression());
-    } else {
-      return;
     }
   });
 };
 
-var isAccessingSuperProperties = function (parent, node) {
-  var obj = node.object;
-  return obj.type === "Identifier" && obj.name === "super" &&
-         parent.object === node;
-};
-
 var addConstructor = function (construct, method) {
   construct.defaults = method.defaults;
   construct.params   = method.params;

package.json

@@ -1,7 +1,7 @@
 {
   "name": "6to5",
   "description": "Turn ES6 code into vanilla ES5 with source maps and no runtime",
-  "version": "1.7.4",
+  "version": "1.7.5",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://github.com/sebmck/6to5",
   "repository": {

test/bin.js

@@ -0,0 +1,50 @@
+var child = require("child_process");
+var fs    = require("fs");
+
+var tmpLoc = __dirname + "/tmp";
+
+var readTree = function () {
+
+};
+
+var run = function (name, args, callback) {
+  args = [__dirname + "/../bin." + name].concat(args);
+  var spawn = child.spawn(process.execPath, args);
+
+  var data = "";
+
+  spawn.stdout.on("write", function (chunk) {
+    data += chunk;
+  });
+
+  spawn.on("close", function () {
+    callback(data);
+  });
+};
+
+before(function () {
+  if (!fs.existsSync(tmpLoc)) fs.mkdirSync(tmpLoc);
+  process.chdir(tmpLoc);
+});
+
+suite("bin/6to5", function () {
+  test("--source-maps-inline");
+
+  test("--source-maps");
+
+  test("--whitelist");
+
+  test("--blacklist");
+
+  test("--out-file");
+
+  test("--out-dir");
+
+  test("stdout");
+});
+
+suite("bin/6to5-node", function () {
+  test("--eval");
+
+  test("--print");
+});

test/fixtures/classes/accessing-super-class/actual.js

@@ -5,4 +5,8 @@ class Test extends Foo {
     super.test();
     foob(super);
   }
+
+  test() {
+    super();
+  }
 }

test/fixtures/classes/accessing-super-class/expected.js

@@ -14,5 +14,8 @@ var Test = function (Foo) {
     }
   });
   Test.__proto__ = Foo;
+  Test.prototype.test = function () {
+    Foo.prototype.test.call(this);
+  };
   return Test;
 }(Foo);

test/fixtures/classes/accessing-super-properties/actual.js

@@ -1,5 +1,6 @@
 class Test extends Foo {
   constructor() {
+    super.test;
     super.test.whatever;
   }
 }

test/fixtures/classes/accessing-super-properties/expected.js

@@ -0,0 +1,18 @@
+var Test = function(Foo) {
+    function Test() {
+        Foo.prototype.test;
+        Foo.prototype.test.whatever;
+    }
+
+    Test.prototype = Object.create(Foo.prototype, {
+        constructor: {
+            value: Test,
+            enumerable: false,
+            writable: true,
+            configurable: true
+        }
+    });
+
+    Test.__proto__ = Foo;
+    return Test;
+}(Foo);

test/fixtures/classes/calling-super-properties/actual.js

@@ -1,5 +1,6 @@
 class Test extends Foo {
   constructor() {
     super.test.whatever();
+    super.test();
   }
 }

test/fixtures/classes/calling-super-properties/expected.js

@@ -0,0 +1,16 @@
+var Test = function(Foo) {
+    function Test() {
+        Foo.prototype.test.whatever();
+        Foo.prototype.test.call(this);
+    }
+    Test.prototype = Object.create(Foo.prototype, {
+        constructor: {
+            value: Test,
+            enumerable: false,
+            writable: true,
+            configurable: true
+        }
+    });
+    Test.__proto__ = Foo;
+    return Test;
+}(Foo);

test/fixtures/classes/no-accessing-super-properties/options.json

@@ -1,3 +0,0 @@
-{
-  "throws": "cannot access super properties"
-}

test/fixtures/classes/no-calling-super-properties/options.json

@@ -1,3 +0,0 @@
-{
-  "throws": "cannot access super properties"
-}

test/fixtures/classes/super-class-member-expression/expected.js

@@ -1,5 +1,6 @@
 var BaseController = function (Chaplin) {
   function BaseController() {
+    Chaplin.Controller.call(this, arguments);
   }
   BaseController.prototype = Object.create(Chaplin.Controller.prototype, {
     constructor: {
@@ -15,6 +16,7 @@ var BaseController = function (Chaplin) {
 
 var BaseController2 = function (Chaplin) {
   function BaseController2() {
+    Chaplin.Controller.Another.call(this, arguments);
   }
   BaseController2.prototype = Object.create(Chaplin.Controller.Another.prototype, {
     constructor: {

test/fixtures/classes/super-class-non-identifiers/expected.js

@@ -1,5 +1,7 @@
 var Q = function(_ref) {
-  function Q() {}
+  function Q() {
+    _ref.call(this, arguments);
+  }
 
   Q.prototype = Object.create(_ref.prototype, {
     constructor: {

test/fixtures/classes/super-class/expected.js

@@ -1,5 +1,6 @@
 var Test = function (Foo) {
   function Test() {
+    Foo.call(this, arguments);
   }
   Test.prototype = Object.create(Foo.prototype, {
     constructor: {