diff --git a/esprima/esprima.d.ts b/esprima/esprima.d.ts
index 10e37a530..c46f20b28 100644
--- a/esprima/esprima.d.ts
+++ b/esprima/esprima.d.ts
@@ -6,29 +6,99 @@
 /// <reference path="../estree/estree.d.ts" />
 
 declare module esprima {
-    var version: string
-    function parse(code: string, options?: Options): ESTree.Program
-    function tokenize(code: string, options?: Options): Array<Token>
+
+    const version: string;
+
+    function parse(code: string, options?: Options): ESTree.Program;
+    function tokenize(code: string, options?: Options): Array<Token>;
 
     interface Token {
-        type: string
-        value: string
+        type: string;
+        value: string;
     }
 
     interface Comment extends ESTree.Node {
-        value: string
+        value: string;
     }
 
     interface Options {
-        loc?: boolean
-        range?: boolean
-        raw?: boolean
-        tokens?: boolean
-        comment?: boolean
-        attachComment?: boolean
-        tolerant?: boolean
-        source?: boolean
+        loc?: boolean;
+        range?: boolean;
+        raw?: boolean;
+        tokens?: boolean;
+        comment?: boolean;
+        attachComment?: boolean;
+        tolerant?: boolean;
+        source?: boolean;
     }
+
+    const Syntax: {
+        AssignmentExpression: string,
+        AssignmentPattern: string,
+        ArrayExpression: string,
+        ArrayPattern: string,
+        ArrowFunctionExpression: string,
+        BlockStatement: string,
+        BinaryExpression: string,
+        BreakStatement: string,
+        CallExpression: string,
+        CatchClause: string,
+        ClassBody: string,
+        ClassDeclaration: string,
+        ClassExpression: string,
+        ConditionalExpression: string,
+        ContinueStatement: string,
+        DoWhileStatement: string,
+        DebuggerStatement: string,
+        EmptyStatement: string,
+        ExportAllDeclaration: string,
+        ExportDefaultDeclaration: string,
+        ExportNamedDeclaration: string,
+        ExportSpecifier: string,
+        ExpressionStatement: string,
+        ForStatement: string,
+        ForOfStatement: string,
+        ForInStatement: string,
+        FunctionDeclaration: string,
+        FunctionExpression: string,
+        Identifier: string,
+        IfStatement: string,
+        ImportDeclaration: string,
+        ImportDefaultSpecifier: string,
+        ImportNamespaceSpecifier: string,
+        ImportSpecifier: string,
+        Literal: string,
+        LabeledStatement: string,
+        LogicalExpression: string,
+        MemberExpression: string,
+        MethodDefinition: string,
+        NewExpression: string,
+        ObjectExpression: string,
+        ObjectPattern: string,
+        Program: string,
+        Property: string,
+        RestElement: string,
+        ReturnStatement: string,
+        SequenceExpression: string,
+        SpreadElement: string,
+        Super: string,
+        SwitchCase: string,
+        SwitchStatement: string,
+        TaggedTemplateExpression: string,
+        TemplateElement: string,
+        TemplateLiteral: string,
+        ThisExpression: string,
+        ThrowStatement: string,
+        TryStatement: string,
+        UnaryExpression: string,
+        UpdateExpression: string,
+        VariableDeclaration: string,
+        VariableDeclarator: string,
+        WhileStatement: string,
+        WithStatement: string,
+        YieldExpression: string
+    };
+
 }
 
 declare module "esprima" {