implement temporal dead zone for default parameters - fixes #169

test/fixtures/transformation/default-parameters/multiple/expected.js

@@ -1,8 +1,8 @@
 "use strict";
 
 var t = function (t, f) {
-  if (f === undefined) f = 5;
   if (t === undefined) t = "foo";
+  if (f === undefined) f = 5;
   return t + " bar " + f;
 };
 

test/fixtures/transformation/default-parameters/tdz-2/actual.js

@@ -0,0 +1 @@
+function foo(a=b, b) {}

test/fixtures/transformation/default-parameters/tdz-2/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Temporal dead zone - accessing a variable before it's initialized"
+}

test/fixtures/transformation/default-parameters/tdz-3/exec.js

@@ -0,0 +1,4 @@
+assert.equal((function(a, b=a++){
+  function b(){}
+  return a;
+})(1), 2);

test/fixtures/transformation/default-parameters/tdz/actual.js

@@ -0,0 +1 @@
+function foo(a=a) {}

test/fixtures/transformation/default-parameters/tdz/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Temporal dead zone - accessing a variable before it's initialized"
+}