Prune unused code

lib/handlebars/base.js

@@ -194,7 +194,7 @@ function registerDefaultHelpers(instance) {
     instance.log(level, context);
   });
 
-  instance.registerHelper('lookup', function(obj, field, options) {
+  instance.registerHelper('lookup', function(obj, field) {
     return obj && obj[field];
   });
 }

lib/handlebars/compiler/ast.js

@@ -37,8 +37,6 @@ var AST = {
       this.sexpr = new AST.SexprNode(rawParams, hash);
     }
 
-    this.sexpr.isRoot = true;
-
     // Support old AST API that stored this info in MustacheNode
     this.id = this.sexpr.id;
     this.params = this.sexpr.params;

lib/handlebars/compiler/compiler.js

@@ -244,7 +244,7 @@ Compiler.prototype = {
       id.falsy = true;
 
       this.ID(id);
-      this.opcode('invokeHelper', params.length, id.original, id.isSimple, sexpr.isRoot);
+      this.opcode('invokeHelper', params.length, id.original, id.isSimple);
     }
   },
 

lib/handlebars/compiler/javascript-compiler.js

@@ -515,7 +515,7 @@ JavaScriptCompiler.prototype = {
   // and pushes the helper's return value onto the stack.
   //
   // If the helper is not found, `helperMissing` is called.
-  invokeHelper: function(paramSize, name, isSimple, isRoot) {
+  invokeHelper: function(paramSize, name, isSimple) {
     this.aliases.helperMissing = 'helpers.helperMissing';
 
     var nonHelper = this.popStack();

lib/handlebars/runtime.js

@@ -120,9 +120,7 @@ export function template(templateSpec, env) {
 
   var ret = function(context, options) {
     options = options || {};
-    var helpers,
-        partials,
-        data = options.data;
+    var data = options.data;
 
     ret._setup(options);
     if (!options.partial && templateSpec.useData) {