arity-of - npm Package Compare versions

Comparing version 1.0.1 to 1.0.2

index.js

@@ -6,3 +6,4 @@ 'use strict';
 // robust against the environment being modified after it is required.
-const { prototype } = Function;
+const FunctionBuiltin = {}.constructor.constructor;
+const { prototype } = FunctionBuiltin;
 const { toString } = prototype;
@@ -114,4 +115,3 @@ const { apply } = Reflect;
 arityOf.getPolyfill = function getPolyfill() {
-  // TODO: look for native
-  return arityOf;
+  return FunctionBuiltin.arityOf || arityOf;
 };
@@ -126,4 +126,15 @@
 arityOf.shim = function shim() {
-  if (!hasOwnProperty(prototype, 'maxArity')) {
+  const polyfill = arityOf.getPolyfill();
+  if (!apply(hasOwnProperty, FunctionBuiltin, [ 'arityOf' ])) {
     defineProperty(
+      FunctionBuiltin,
+      'arityOf',
+      {
+        configurable: true,
+        writable: true,
+        value: polyfill,
+      });
+  }
+  if (!apply(hasOwnProperty, prototype, [ 'maxArity' ])) {
+    defineProperty(
       prototype,
@@ -134,7 +145,7 @@ 'maxArity',
         get() {
-          return arityOf(this).max;
+          return polyfill(this).max;
         },
       });
   }
-  if (!hasOwnProperty(prototype, 'usesRest')) {
+  if (!apply(hasOwnProperty, prototype, [ 'usesRest' ])) {
     defineProperty(
@@ -146,6 +157,7 @@ prototype,
         get() {
-          return arityOf(this).usesRest;
+          return polyfill(this).usesRest;
         },
       });
   }
+  // TODO: do we need to install on AsyncFunction, GeneratorFunction, etc.
 };

package.json

 {
   "name": "arity-of",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Exposes max arity and other metadata for JS functions",
@@ -5,0 +5,0 @@ "main": "index.js",

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Improved metrics

Total package byte prevSize

24815

increased by1.73%

Lines of code

284

increased by4.41%

No dependency changes