diff --git a/example/lib/functionsFactory.js b/example/lib/functionsFactory.js
index d75e2e1..ef7c400 100644
--- a/example/lib/functionsFactory.js
+++ b/example/lib/functionsFactory.js
@@ -1,17 +1,14 @@
 'use strict';
 Object.defineProperty(exports, "__esModule", { value: true });
-const fs = require("fs");
-const path = require("path");
-const functionsDir = path.join(__dirname, '/functions');
+const userFunc_1 = require("./functions/userFunc");
+const counterFunc_1 = require("./functions/counterFunc");
 const functionsTable = {};
 exports.functionsTable = functionsTable;
-fs.readdirSync(functionsDir).forEach((file) => {
-    if (file.endsWith('.js')) {
-        const data = require(path.join(functionsDir, file)).factory;
-        const description = data();
-        if (functionsTable[description.name]) {
-            throw new Error(`Function with name ${description.name} already exists`);
-        }
-        functionsTable[description.name] = description.evaluate;
+const _addFunction = (description) => {
+    if (functionsTable[description.name]) {
+        throw new Error(`Function with name ${description.name} already exists`);
     }
-});
+    functionsTable[description.name] = description.evaluate;
+};
+_addFunction(userFunc_1.factory());
+_addFunction(counterFunc_1.factory());
diff --git a/example/lib/functionsFactory.ts b/example/lib/functionsFactory.ts
index 2332516..e9e5b50 100644
--- a/example/lib/functionsFactory.ts
+++ b/example/lib/functionsFactory.ts
@@ -1,9 +1,9 @@
 'use strict';
 
-import * as fs from 'fs';
-import * as path from 'path';
 import {Func, FunctionsTable} from "../../dist";
 import {ExpressionContext} from "./evaluator";
+import {factory as userFuncFactory} from './functions/userFunc';
+import {factory as counterFuncFactory} from './functions/counterFunc';
 
 export interface FunctionDescription {
     name: string;
@@ -12,19 +12,16 @@ export interface FunctionDescription {
 
 export type FuncFactory = () => FunctionDescription;
 
-const functionsDir = path.join(__dirname, '/functions');
-
 const functionsTable: FunctionsTable<ExpressionContext> = {};
 
-fs.readdirSync(functionsDir).forEach((file) => {
-  if (file.endsWith('.js')) {
-    const data = require(path.join(functionsDir, file)).factory as FuncFactory;
-    const description = data();
+const _addFunction = (description: FunctionDescription) : void => {
     if (functionsTable[description.name]) {
-      throw new Error(`Function with name ${description.name} already exists`);
+        throw new Error(`Function with name ${description.name} already exists`);
     }
     functionsTable[description.name] = description.evaluate;
-  }
-});
+};
+
+_addFunction(userFuncFactory());
+_addFunction(counterFuncFactory());
 
 export { functionsTable };
diff --git a/package.json b/package.json
index be82938..e30dea3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "json-expression-eval",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "description": "evaluate a json described boolean expression using dynamic functions",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/test/index.spec.ts b/test/index.spec.ts
index 61cd54b..3e0c8b9 100644
--- a/test/index.spec.ts
+++ b/test/index.spec.ts
@@ -1,161 +1,223 @@
 'use strict';
 
-import { expect } from 'chai';
-import { evaluate } from '../dist/index';
+import {expect} from 'chai';
+import {evaluate} from '../dist';
 
-describe('evaluator', function() {
+interface Context {
+    userId: string;
+    timesCounter: number;
+}
+
+describe('evaluator', function () {
 
     const functionsTable = {
-        user: (user: string, context: {userId: string}): boolean => {
+        user: (user: string, context: { userId: string }): boolean => {
             return context.userId === user;
         }
     };
 
-    it('should evaluate short eq compare op to true', function() {
-        expect(evaluate({ timesCounter: 5 }, { timesCounter: 5 }, functionsTable)).to.eql(true);
+    it('should evaluate short eq compare op to true', function () {
+        expect(evaluate<Context>({timesCounter: 5}, {timesCounter: 5, userId: 'a'}, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate short eq compare op to false', function() {
-        expect(evaluate({ timesCounter: 5 }, { timesCounter: 7 }, functionsTable)).to.eql(false);
+    it('should evaluate short eq compare op to false', function () {
+        expect(evaluate<Context>({timesCounter: 5}, {timesCounter: 7, userId: 'a'}, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate eq compare op to true', function() {
-        expect(evaluate({ timesCounter: {eq: 5} }, { timesCounter: 5 }, functionsTable)).to.eql(true);
+    it('should evaluate eq compare op to true', function () {
+        expect(evaluate<Context>({timesCounter: {eq: 5}}, {timesCounter: 5, userId: 'a'}, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate eq compare op to false', function() {
-        expect(evaluate({ timesCounter: {eq: 5} }, { timesCounter: 7 }, functionsTable)).to.eql(false);
+    it('should evaluate eq compare op to false', function () {
+        expect(evaluate<Context>({timesCounter: {eq: 5}}, {
+            timesCounter: 7,
+            userId: 'a'
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate neq compare op to true', function() {
-        expect(evaluate({ timesCounter: {neq: 5} }, { timesCounter: 8 }, functionsTable)).to.eql(true);
+    it('should evaluate neq compare op to true', function () {
+        expect(evaluate<Context>({timesCounter: {neq: 5}}, {
+            timesCounter: 8,
+            userId: 'a'
+        }, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate eq compare op to false', function() {
-        expect(evaluate({ timesCounter: {neq: 5} }, { timesCounter: 5 }, functionsTable)).to.eql(false);
+    it('should evaluate eq compare op to false', function () {
+        expect(evaluate<Context>({timesCounter: {neq: 5}}, {
+            timesCounter: 5,
+            userId: 'a'
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate gt compare op to true', function() {
-        expect(evaluate({ timesCounter: {gt: 5} }, { timesCounter: 8 }, functionsTable)).to.eql(true);
+    it('should evaluate gt compare op to true', function () {
+        expect(evaluate<Context>({timesCounter: {gt: 5}}, {timesCounter: 8, userId: 'a'}, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate gt compare op to false', function() {
-        expect(evaluate({ timesCounter: {gt: 5} }, { timesCounter: 3 }, functionsTable)).to.eql(false);
+    it('should evaluate gt compare op to false', function () {
+        expect(evaluate<Context>({timesCounter: {gt: 5}}, {
+            timesCounter: 3,
+            userId: 'a'
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate gt compare op to false 2', function() {
-        expect(evaluate({ timesCounter: {gt: 5} }, { timesCounter: 5 }, functionsTable)).to.eql(false);
+    it('should evaluate gt compare op to false 2', function () {
+        expect(evaluate<Context>({timesCounter: {gt: 5}}, {
+            timesCounter: 5,
+            userId: 'a'
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate gte compare op to true', function() {
-        expect(evaluate({ timesCounter: {gte: 5} }, { timesCounter: 8 }, functionsTable)).to.eql(true);
+    it('should evaluate gte compare op to true', function () {
+        expect(evaluate<Context>({timesCounter: {gte: 5}}, {
+            timesCounter: 8,
+            userId: 'a'
+        }, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate gte compare op to true 2', function() {
-        expect(evaluate({ timesCounter: {gte: 5} }, { timesCounter: 5 }, functionsTable)).to.eql(true);
+    it('should evaluate gte compare op to true 2', function () {
+        expect(evaluate<Context>({timesCounter: {gte: 5}}, {
+            timesCounter: 5,
+            userId: 'a'
+        }, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate gte compare op to false', function() {
-        expect(evaluate({ timesCounter: {gte: 5} }, { timesCounter: 3 }, functionsTable)).to.eql(false);
+    it('should evaluate gte compare op to false', function () {
+        expect(evaluate<Context>({timesCounter: {gte: 5}}, {
+            timesCounter: 3,
+            userId: 'a'
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate lt compare op to true', function() {
-        expect(evaluate({ timesCounter: {lt: 5} }, { timesCounter: 3 }, functionsTable)).to.eql(true);
+    it('should evaluate lt compare op to true', function () {
+        expect(evaluate<Context>({timesCounter: {lt: 5}}, {timesCounter: 3, userId: 'a'}, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate gt compare lt to false', function() {
-        expect(evaluate({ timesCounter: {lt: 5} }, { timesCounter: 8 }, functionsTable)).to.eql(false);
+    it('should evaluate gt compare lt to false', function () {
+        expect(evaluate<Context>({timesCounter: {lt: 5}}, {
+            timesCounter: 8,
+            userId: 'a'
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate lt compare op to false 2', function() {
-        expect(evaluate({ timesCounter: {lt: 5} }, { timesCounter: 5 }, functionsTable)).to.eql(false);
+    it('should evaluate lt compare op to false 2', function () {
+        expect(evaluate<Context>({timesCounter: {lt: 5}}, {
+            timesCounter: 5,
+            userId: 'a'
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate lte compare op to true', function() {
-        expect(evaluate({ timesCounter: {lte: 5} }, { timesCounter: 3 }, functionsTable)).to.eql(true);
+    it('should evaluate lte compare op to true', function () {
+        expect(evaluate<Context>({timesCounter: {lte: 5}}, {
+            timesCounter: 3,
+            userId: 'a'
+        }, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate lte compare op to true 2', function() {
-        expect(evaluate({ timesCounter: {lte: 5} }, { timesCounter: 5 }, functionsTable)).to.eql(true);
+    it('should evaluate lte compare op to true 2', function () {
+        expect(evaluate<Context>({timesCounter: {lte: 5}}, {
+            timesCounter: 5,
+            userId: 'a'
+        }, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate lte compare op to false', function() {
-        expect(evaluate({ timesCounter: {lte: 5} }, { timesCounter: 8 }, functionsTable)).to.eql(false);
+    it('should evaluate lte compare op to false', function () {
+        expect(evaluate<Context>({timesCounter: {lte: 5}}, {
+            timesCounter: 8,
+            userId: 'a'
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate a single function', function() {
-        expect(evaluate({ user: 'r@a.com' }, { userId: 'r@a.com' }, functionsTable)).to.eql(true);
+    it('should evaluate a single function', function () {
+        expect(evaluate<Context>({user: 'r@a.com'}, {userId: 'r@a.com', timesCounter: 8}, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate a single not function to false', function() {
-        expect(evaluate({ not: { user: 'r@a.com' } }, { userId: 'r@a.com' }, functionsTable)).to.eql(false);
+    it('should evaluate a single not function to false', function () {
+        expect(evaluate<Context>({not: {user: 'r@a.com'}}, {
+            userId: 'r@a.com',
+            timesCounter: 8
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate a single not function to true', function() {
-        expect(evaluate({ not: { user: 'a@a.com' } }, { userId: 'r@a.com' }, functionsTable)).to.eql(true);
+    it('should evaluate a single not function to true', function () {
+        expect(evaluate<Context>({not: {user: 'a@a.com'}}, {
+            userId: 'r@a.com',
+            timesCounter: 8
+        }, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate a single and function to true', function() {
-        expect(evaluate({ and: [{ user: 'r@a.com' }] }, { userId: 'r@a.com' }, functionsTable)).to.eql(true);
+    it('should evaluate a single and function to true', function () {
+        expect(evaluate<Context>({and: [{user: 'r@a.com'}]}, {
+            userId: 'r@a.com',
+            timesCounter: 8
+        }, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate a single or function to true', function() {
-        expect(evaluate({ or: [{ user: 'r@a.com' }] }, { userId: 'r@a.com' }, functionsTable)).to.eql(true);
+    it('should evaluate a single or function to true', function () {
+        expect(evaluate<Context>({or: [{user: 'r@a.com'}]}, {
+            userId: 'r@a.com',
+            timesCounter: 8
+        }, functionsTable)).to.eql(true);
     });
 
-    it('should evaluate a single and function to false', function() {
-        expect(evaluate({ and: [{ user: 't@a.com' }] }, { userId: 'r@a.com' }, functionsTable)).to.eql(false);
+    it('should evaluate a single and function to false', function () {
+        expect(evaluate<Context>({and: [{user: 't@a.com'}]}, {
+            userId: 'r@a.com',
+            timesCounter: 8
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should evaluate a single or function to false', function() {
-        expect(evaluate({ or: [{ user: 't@a.com' }] }, { userId: 'r@a.com' }, functionsTable)).to.eql(false);
+    it('should evaluate a single or function to false', function () {
+        expect(evaluate<Context>({or: [{user: 't@a.com'}]}, {
+            userId: 'r@a.com',
+            timesCounter: 8
+        }, functionsTable)).to.eql(false);
     });
 
-    it('should fail on empty or op', function() {
-        expect(function() {
-            evaluate({ or: [] }, { userId: 'r@a.com' }, functionsTable);
+    it('should fail on empty or op', function () {
+        expect(function () {
+            evaluate<Context>({or: []}, {userId: 'r@a.com', timesCounter: 8}, functionsTable);
         }).to.throw('Invalid expression - or operator must have at least one expression');
     });
 
-    it('should fail on empty and op', function() {
-        expect(function() {
-            evaluate({ and: [] }, { userId: 'r@a.com' }, functionsTable);
+    it('should fail on empty and op', function () {
+        expect(function () {
+            evaluate<Context>({and: []}, {userId: 'r@a.com', timesCounter: 8}, functionsTable);
         }).to.throw('Invalid expression - and operator must have at least one expression');
     });
 
-    it('should fail on non existing function', function() {
-        expect(function() {
-            evaluate({ and: [{ dummy: 1 }] }, { userId: 'r@a.com' }, functionsTable);
+    it('should fail on non existing function', function () {
+        expect(function () {
+            evaluate<Context>({and: [{dummy: 1}]}, {userId: 'r@a.com', timesCounter: 8}, functionsTable);
         }).to.throw('Invalid expression - unknown function dummy');
     });
 
-    it('should fail on non existing function 2', function() {
-        expect(function() {
-            evaluate({ dummy: 1 }, { userId: 'r@a.com' }, functionsTable);
+    it('should fail on non existing function 2', function () {
+        expect(function () {
+            evaluate<Context>({dummy: 1}, {userId: 'r@a.com', timesCounter: 8}, functionsTable);
         }).to.throw('Invalid expression - unknown function dummy');
     });
 
-    it('should fail on non existing op', function() {
-        expect(function() {
-            evaluate({ userId: {bk : 1} }, { userId: 'r@a.com' }, functionsTable);
+    it('should fail on non existing op', function () {
+        expect(function () {
+            evaluate<Context>({userId: {bk: 1}}, {userId: 'r@a.com', timesCounter: 8}, functionsTable);
         }).to.throw('Invalid expression - unknown op bk');
     });
 
-    it('should fail too many keys to op', function() {
-        expect(function() {
-            evaluate({ userId: {eq : 1, nq: 2} }, { userId: 'r@a.com' }, functionsTable);
+    it('should fail too many keys to op', function () {
+        expect(function () {
+            evaluate<Context>({userId: {eq: 1, nq: 2}}, {userId: 'r@a.com', timesCounter: 8}, functionsTable);
         }).to.throw('Invalid expression - too may keys');
     });
 
-    it('should fail too many keys', function() {
-        expect(function() {
-            evaluate({ dummy: 1, user: 'a' }, { userId: 'r@a.com' }, functionsTable);
+    it('should fail too many keys', function () {
+        expect(function () {
+            evaluate<Context>({dummy: 1, user: 'a'}, {userId: 'r@a.com', timesCounter: 8}, functionsTable);
         }).to.throw('Invalid expression - too may keys');
     });
 
-    it('should fail too many keys 2', function() {
-        expect(function() {
-            evaluate({ or: [{ dummy: 1, user: 'a' }] }, { userId: 'r@a.com' }, functionsTable);
+    it('should fail too many keys 2', function () {
+        expect(function () {
+            evaluate<Context>({or: [{dummy: 1, user: 'a'}]}, {userId: 'r@a.com', timesCounter: 8}, functionsTable);
         }).to.throw('Invalid expression - too may keys');
     });
 });