Improve rendering performance

Avoid unnecessary copies via Utils.extend in hot paths.

lib/handlebars/internal/proto-access.js

@@ -1,9 +1,11 @@
-import { createNewLookupObject } from './create-new-lookup-object';
+import { extend } from '../utils';
 import logger from '../logger';
 
 const loggedProperties = Object.create(null);
 
 export function createProtoAccessControl(runtimeOptions) {
+  // Create an object with "null"-prototype to avoid truthy results on
+  // prototype properties.
   let defaultMethodWhiteList = Object.create(null);
   defaultMethodWhiteList['constructor'] = false;
   defaultMethodWhiteList['__defineGetter__'] = false;
@@ -16,14 +18,14 @@ export function createProtoAccessControl(runtimeOptions) {
 
   return {
     properties: {
-      whitelist: createNewLookupObject(
+      whitelist: extend(
         defaultPropertyWhiteList,
         runtimeOptions.allowedProtoProperties
       ),
       defaultValue: runtimeOptions.allowProtoPropertiesByDefault
     },
     methods: {
-      whitelist: createNewLookupObject(
+      whitelist: extend(
         defaultMethodWhiteList,
         runtimeOptions.allowedProtoMethods
       ),

lib/handlebars/runtime.js

@@ -74,25 +74,18 @@ export function template(templateSpec, env) {
     }
     partial = env.VM.resolvePartial.call(this, partial, context, options);
 
-    let extendedOptions = Utils.extend({}, options, {
-      hooks: this.hooks,
-      protoAccessControl: this.protoAccessControl
-    });
-
-    let result = env.VM.invokePartial.call(
-      this,
-      partial,
-      context,
-      extendedOptions
-    );
+    options.hooks = this.hooks;
+    options.protoAccessControl = this.protoAccessControl;
+
+    let result = env.VM.invokePartial.call(this, partial, context, options);
 
     if (result == null && env.compile) {
       options.partials[options.name] = env.compile(
         partial,
         templateSpec.compilerOptions,
         env
       );
-      result = options.partials[options.name](context, extendedOptions);
+      result = options.partials[options.name](context, options);
     }
     if (result != null) {
       if (options.indent) {
@@ -438,6 +431,7 @@ function wrapHelpersToPassLookupProperty(mergedHelpers, container) {
 function passLookupPropertyOption(helper, container) {
   const lookupProperty = container.lookupProperty;
   return wrapHelper(helper, options => {
-    return Utils.extend({ lookupProperty }, options);
+    options.lookupProperty = lookupProperty;
+    return options;
   });
 }