use Symbol.iterator in for symbol detection and add the conversion of it to the selfContained transformer - @zloirock

test/fixtures/transformation/es6-destructuring/array/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 var _ref = ["hello", [", ", "junk"], ["world"]];
 

test/fixtures/transformation/es6-destructuring/assignment-expression/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
 var _temp, _temp2;
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 console.log((_temp = [123], _temp2 = _slicedToArray(_temp, 1), x = _temp2[0], _temp));

test/fixtures/transformation/es6-destructuring/assignment-statement/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 var _ref = f();
 

test/fixtures/transformation/es6-destructuring/empty/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 var _ref = ["foo", "hello", [", ", "junk"], ["world"]];
 

test/fixtures/transformation/es6-destructuring/for-in/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 for (var _ref in obj) {
   var _ref2 = _slicedToArray(_ref, 2);

test/fixtures/transformation/es6-destructuring/for-of/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 for (var _iterator = test.expectation.registers[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) {
   var _step$value = _slicedToArray(_step.value, 3);

test/fixtures/transformation/es6-destructuring/member-expression/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 var _ref = [1, 2];
 

test/fixtures/transformation/es6-destructuring/mixed/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 var _rect$topLeft = _slicedToArray(rect.topLeft, 2);
 

test/fixtures/transformation/es6-destructuring/parameters/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _slicedToArray = function (arr, i) { if (!arr || !arr[Symbol.iterator]) { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } else if (Array.isArray(arr)) { return arr; } else { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } };
+var _slicedToArray = function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { var _arr = []; for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) { _arr.push(_step.value); if (i && _arr.length === i) break; } return _arr; } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } };
 
 function somethingAdvanced(_ref) {
   var _ref$topLeft = _ref.topLeft;

test/fixtures/transformation/self-contained/symbol-iterator-in/actual.js

@@ -0,0 +1 @@
+Symbol.iterator in Object(arr);

test/fixtures/transformation/self-contained/symbol-iterator-in/expected.js

@@ -0,0 +1,5 @@
+"use strict";
+
+var _core = require("6to5-runtime/core-js");
+
+_core.$for.isIterable(Object(arr));