docs: note difference with Reflect.ownKeys

babel · Jul 9, 2019 · d5f8af0 · d5f8af0
1 parent 3d4928c
commit d5f8af0
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/packages/babel-helpers/src/helpers.js b/packages/babel-helpers/src/helpers.js
@@ -409,6 +409,10 @@ helpers.objectSpread = helper("7.0.0-beta.0")`
 helpers.objectSpread2 = helper("7.5.0")`
   import defineProperty from "defineProperty";
 
+  // This function is different to "Reflect.ownKeys". The enumerableOnly
+  // filters on symbol properties only. Return value always include enumerable 
+  // string properties. It is good to use in objectSpread.
+
   function ownKeys(object, enumerableOnly) {
     var keys = Object.keys(object);
     if (Object.getOwnPropertySymbols) {