Simplify the helpers for classPrivateField{Get,Set} (#10117)

No need to do the hash lookup twice. If the descriptor is not in the WeakMap `get` returns `undefined`.
babel · Jun 21, 2019 · 8f8a457 · 8f8a457
1 parent 11fa246
commit 8f8a457
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/packages/babel-helpers/src/helpers.js b/packages/babel-helpers/src/helpers.js
@@ -1070,10 +1070,10 @@ helpers.classPrivateFieldLooseBase = helper("7.0.0-beta.0")`
 
 helpers.classPrivateFieldGet = helper("7.0.0-beta.0")`
   export default function _classPrivateFieldGet(receiver, privateMap) {
-    if (!privateMap.has(receiver)) {
+    var descriptor = privateMap.get(receiver);
+    if (!descriptor) {
       throw new TypeError("attempted to get private field on non-instance");
     }
-    var descriptor = privateMap.get(receiver);
     if (descriptor.get) {
       return descriptor.get.call(receiver);
     }
@@ -1083,10 +1083,10 @@ helpers.classPrivateFieldGet = helper("7.0.0-beta.0")`
 
 helpers.classPrivateFieldSet = helper("7.0.0-beta.0")`
   export default function _classPrivateFieldSet(receiver, privateMap, value) {
-    if (!privateMap.has(receiver)) {
+    var descriptor = privateMap.get(receiver);
+    if (!descriptor) {
       throw new TypeError("attempted to set private field on non-instance");
     }
-    var descriptor = privateMap.get(receiver);
     if (descriptor.set) {
       descriptor.set.call(receiver, value);
     } else {