Let let the first getter win when adding a getter that already exists. (

#106)

lib/entry.js

@@ -35,8 +35,6 @@ function makeUniqueKey() {
 }
 
 Ep.addSetters = function (parent, setters, key) {
-  var entry = this;
-
   if (typeof key === "undefined") {
     // If no key was provided, make a new unique key that won't collide
     // with any other keys.
@@ -57,15 +55,14 @@ Ep.addSetters = function (parent, setters, key) {
         // Ignore any requests for the exports.__esModule property."
         name !== "__esModule") {
       setter.parent = parent;
-      (entry.setters[name] =
-       entry.setters[name] || Object.create(null)
+      (this.setters[name] =
+       this.setters[name] || Object.create(null)
       )[key] = setter;
     }
   }
 };
 
 Ep.addGetters = function (getters) {
-  var entry = this;
   var names = Object.keys(getters);
   var nameCount = names.length;
 
@@ -74,9 +71,10 @@ Ep.addGetters = function (getters) {
     var getter = getters[name];
     if (typeof getter === "function" &&
         // Ignore any requests for the exports.__esModule property."
-        name !== "__esModule") {
-      // Should this throw if hasOwn.call(this.getters, name)?
-      entry.getters[name] = getter;
+        name !== "__esModule" &&
+        // Should this throw if hasOwn.call(this.getters, name)?
+        ! hasOwn.call(this.getters, name)) {
+      this.getters[name] = getter;
     }
   }
 };
@@ -94,12 +92,11 @@ function runModuleGetters(module) {
 }
 
 Ep.runModuleGetters = function (module) {
-  var entry = this;
-  var names = Object.keys(entry.getters);
+  var names = Object.keys(this.getters);
   var nameCount = names.length;
 
   for (var i = 0; i < nameCount; ++i) {
-    entry.runGetter(module, names[i]);
+    this.runGetter(module, names[i]);
   }
 };
 
@@ -123,14 +120,14 @@ Ep.runGetter = function (module, name) {
 // setters associated with the newly exported values.
 Ep.runModuleSetters = function (module) {
   var entry = this;
-  var names = Object.keys(entry.setters);
+  var names = Object.keys(this.setters);
 
   // Make sure module.exports is up to date before we call
   // module.getExportByName(name).
-  entry.runModuleGetters(module);
+  this.runModuleGetters(module);
 
   if (names.length === 0) {
-    ++entry.runCount;
+    ++this.runCount;
     return;
   }