to-fast-properties - npm Package Compare versions

Comparing version 1.0.3 to 2.0.0

index.js

 'use strict';
+
+let fastProto = null;
+
+// Creates an object with permanently fast properties in V8. See Toon Verwaest's
+// post https://medium.com/@tverwaes/setting-up-prototypes-in-v8-ec9c9491dfe2#5f62
+// for more details. Use %HasFastProperties(object) and the Node.js flag
+// --allow-natives-syntax to check whether an object has fast properties.
+function FastObject(o) {
+	// A prototype object will have "fast properties" enabled once it is checked
+	// against the inline property cache of a function, e.g. fastProto.property:
+	// https://github.com/v8/v8/blob/6.0.122/test/mjsunit/fast-prototype.js#L48-L63
+	if (fastProto !== null && typeof fastProto.property) {
+		const result = fastProto;
+		fastProto = FastObject.prototype = null;
+		return result;
+	}
+	fastProto = FastObject.prototype = o == null ? Object.create(null) : o;
+	return new FastObject;
+}
+
+// Initialize the inline property cache of FastObject
+FastObject();
+
 module.exports = function toFastproperties(o) {
-	function Sub() {}
-	Sub.prototype = o;
-	var receiver = new Sub(); // create an instance
-	function ic() { return typeof receiver.foo; } // perform access
-	ic(); 
-	ic();
-	return o;
-	eval("o" + o); // ensure no dead code elimination
-}
+	return FastObject(o);
+};

package.json

 {
   "name": "to-fast-properties",
-  "version": "1.0.3",
+  "version": "2.0.0",
   "description": "Force V8 to use fast properties for an object",
@@ -13,3 +13,3 @@ "license": "MIT",
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=4"
   },
@@ -16,0 +16,0 @@ "scripts": {

readme.md

@@ -37,2 +37,2 @@ # to-fast-properties [![Build Status](https://travis-ci.org/sindresorhus/to-fast-properties.svg?branch=master)](https://travis-ci.org/sindresorhus/to-fast-properties)
 
-MIT © Petka Antonov, Sindre Sorhus
+MIT © Petka Antonov, John-David Dalton, Sindre Sorhus

No alert changes

Improved metrics

Total package byte prevSize

3496

increased by25.53%

Lines of code

23

increased by109.09%

No dependency changes