vaoid being greedy when destructuring array iterables

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

@@ -1,18 +1,29 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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 _ref = [1, 2];
 
-var _ref2 = _toArray(_ref);
+var _ref2 = _slicedToArray(_ref, 2);
 
 var a = _ref2[0];
 var b = _ref2[1];
 var _ref3 = [3, 4];
 
-var _ref4 = _toArray(_ref3);
+var _ref4 = _slicedToArray(_ref3, 2);
 
 var c = _ref4[0];
 var d = _ref4[1];

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

@@ -1,18 +1,29 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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 _ref = ["hello", [", ", "junk"], ["world"]];
 
-var _ref2 = _toArray(_ref);
+var _ref2 = _slicedToArray(_ref, 4);
 
 var a = _ref2[0];
-var _ref3 = _toArray(_ref2[1]);
+var _ref3 = _slicedToArray(_ref2[1], 1);
 
 var b = _ref3[0];
-var _ref4 = _toArray(_ref2[2]);
+var _ref4 = _slicedToArray(_ref2[2], 1);
 
 var c = _ref4[0];
 var d = _ref2[3];

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

@@ -1,8 +1,19 @@
 "use strict";
 
 var _temp, _ref;
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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;
+  }
 };
 
-console.log((_temp = [123], _ref = _toArray(_temp), x = _ref[0], _temp));
+console.log((_temp = [123], _ref = _slicedToArray(_temp, 1), x = _ref[0], _temp));

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

@@ -1,12 +1,23 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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 _ref = f();
 
-var _ref2 = _toArray(_ref);
+var _ref2 = _slicedToArray(_ref, 2);
 
 a = _ref2[0];
 b = _ref2[1];

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

@@ -1,18 +1,29 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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 _ref = ["foo", "hello", [", ", "junk"], ["world"]];
 
-var _ref2 = _toArray(_ref);
+var _ref2 = _slicedToArray(_ref, 5);
 
 var a = _ref2[1];
-var _ref3 = _toArray(_ref2[2]);
+var _ref3 = _slicedToArray(_ref2[2], 1);
 
 var b = _ref3[0];
-var _ref4 = _toArray(_ref2[3]);
+var _ref4 = _slicedToArray(_ref2[3], 1);
 
 var c = _ref4[0];
 var d = _ref2[4];

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

@@ -1,11 +1,22 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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;
+  }
 };
 
 for (var _ref in obj) {
-  var _ref2 = _toArray(_ref);
+  var _ref2 = _slicedToArray(_ref, 2);
 
   var name = _ref2[0];
   var value = _ref2[1];

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

@@ -1,12 +1,23 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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;
+  }
 };
 
 for (var _iterator = this.test.expectation.registers[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) {
   var _ref = _step.value;
-  var _ref2 = _toArray(_ref);
+  var _ref2 = _slicedToArray(_ref, 3);
 
   var name = _ref2[0];
   var before = _ref2[1];

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

@@ -1,12 +1,23 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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 _ref = [1, 2];
 
-var _ref2 = _toArray(_ref);
+var _ref2 = _slicedToArray(_ref, 2);
 
 this.foo = _ref2[0];
 this.bar = _ref2[1];

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

@@ -1,14 +1,25 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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 _ref = _toArray(rect.topLeft);
+var _ref = _slicedToArray(rect.topLeft, 2);
 
 var x1 = _ref[0];
 var y1 = _ref[1];
-var _ref2 = _toArray(rect.bottomRight);
+var _ref2 = _slicedToArray(rect.bottomRight, 2);
 
 var x2 = _ref2[0];
 var y2 = _ref2[1];

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

@@ -1,7 +1,18 @@
 "use strict";
 
-var _toArray = function (arr) {
-  return Array.isArray(arr) ? arr : Array.from(arr);
+var _slicedToArray = function (arr, i) {
+  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;
+  }
 };
 
 function somethingAdvanced(_ref) {
@@ -20,12 +31,12 @@ function unpackObject(_ref2) {
 console.log(unpackObject({ title: "title", author: "author" }));
 
 var unpackArray = function (_ref3, _ref5) {
-  var _ref4 = _toArray(_ref3);
+  var _ref4 = _slicedToArray(_ref3, 3);
 
   var a = _ref4[0];
   var b = _ref4[1];
   var c = _ref4[2];
-  var _ref6 = _toArray(_ref5);
+  var _ref6 = _slicedToArray(_ref5, 3);
 
   var x = _ref6[0];
   var y = _ref6[1];