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node_modules/to-fast-properties/index.js

@@ -1,11 +1,27 @@
 'use strict';
-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
+
+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) {
+	return FastObject(o);
+};