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only evaluate object destructuring pattern once

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This commit is contained in:
Sebastian McKenzie 2015-02-08 20:22:46 +11:00
parent 4ea0175ca7
commit bcc9e016b1
3 changed files with 18 additions and 8 deletions
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6
lib/6to5/transformation/transformers/es6/destructuring.js
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@ -112,6 +112,12 @@ Destructuring.prototype.pushObjectPattern = function (pattern, parentId) {
));
}
if (pattern.properties.length > 1 && t.isMemberExpression(parentId)) {
var temp = this.scope.generateUidBasedOnNode(parentId, this.file);
this.nodes.push(this.buildVariableDeclaration(temp, parentId));
parentId = temp;
}
for (var i = 0; i < pattern.properties.length; i++) {
var prop = pattern.properties[i];
if (t.isSpreadProperty(prop)) {

10
test/fixtures/transformation/es6-destructuring/object-advanced/expected.js vendored
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@ -1,6 +1,8 @@
"use strict";
var x1 = rect.topLeft.x;
var y1 = rect.topLeft.y;
var x2 = rect.bottomRight.x;
var y2 = rect.bottomRight.y;
var _rect$topLeft = rect.topLeft;
var x1 = _rect$topLeft.x;
var y1 = _rect$topLeft.y;
var _rect$bottomRight = rect.bottomRight;
var x2 = _rect$bottomRight.x;
var y2 = _rect$bottomRight.y;

10
test/fixtures/transformation/es6-destructuring/parameters/expected.js vendored
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@ -3,10 +3,12 @@
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) {
var x1 = _ref.topLeft.x;
var y1 = _ref.topLeft.y;
var x2 = _ref.bottomRight.x;
var y2 = _ref.bottomRight.y;
var _ref$topLeft = _ref.topLeft;
var x1 = _ref$topLeft.x;
var y1 = _ref$topLeft.y;
var _ref$bottomRight = _ref.bottomRight;
var x2 = _ref$bottomRight.x;
var y2 = _ref$bottomRight.y;
}
function unpackObject(_ref) {