From 710a7f882d62c38de48601a06506748c7fc51bd9 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Sat, 28 Mar 2015 00:21:37 +1100
Subject: [PATCH] add loose mode for es6.spread and es6.destructuring that
 assumes all values are arrays - emberjs/ember.js#10730

---
 .../transformation/transformers/es6/destructuring.js | 12 ++++++++++--
 src/babel/transformation/transformers/es6/spread.js  |  6 +++++-
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/babel/transformation/transformers/es6/destructuring.js b/src/babel/transformation/transformers/es6/destructuring.js
index 8c11eca2d5..400716b8b8 100644
--- a/src/babel/transformation/transformers/es6/destructuring.js
+++ b/src/babel/transformation/transformers/es6/destructuring.js
@@ -434,7 +434,11 @@ class DestructuringTransformer {
     // return a locally bound identifier if it's been inferred to be an array,
     // otherwise it'll be a call to a helper that will ensure it's one
 
-    var toArray = this.scope.toArray(arrayRef, count);
+    var toArray = arrayRef;
+
+    if (!this.file.isLoose("es6.destructuring")) {
+      toArray = this.scope.toArray(arrayRef, count);
+    }
 
     if (t.isIdentifier(toArray)) {
       // we've been given an identifier so it must have been inferred to be an
@@ -457,7 +461,11 @@ class DestructuringTransformer {
       var elemRef;
 
       if (t.isRestElement(elem)) {
-        elemRef = this.scope.toArray(arrayRef);
+        elemRef = arrayRef;
+
+        if (!this.file.isLoose("es6.destructuring")) {
+          elemRef = this.scope.toArray(arrayRef);
+        }
 
         if (i > 0) {
           elemRef = t.callExpression(t.memberExpression(elemRef, t.identifier("slice")), [t.literal(i)]);
diff --git a/src/babel/transformation/transformers/es6/spread.js b/src/babel/transformation/transformers/es6/spread.js
index b47e5b24b4..d56f9c9c66 100644
--- a/src/babel/transformation/transformers/es6/spread.js
+++ b/src/babel/transformation/transformers/es6/spread.js
@@ -2,7 +2,11 @@ import includes from "lodash/collection/includes";
 import * as t from "../../../types";
 
 function getSpreadLiteral(spread, scope) {
-  return scope.toArray(spread.argument, true);
+  if (scope.file.isLoose("es6.spread")) {
+    return spread.argument;
+  } else {
+    return scope.toArray(spread.argument, true);
+  }
 }
 
 function hasSpread(nodes) {