diff --git a/dist/src/Utils.js b/dist/src/Utils.js
index 8b09d938..bdaab6d9 100644
--- a/dist/src/Utils.js
+++ b/dist/src/Utils.js
@@ -21,7 +21,11 @@ class Utils {
         return newArray;
     }
     static decToHex(dec) {
-        return (dec + Math.pow(16, 6)).toString(16).substr(-6).replace(Utils.hexRepetitiveZerosRegExp, '');
+        const decToHexSliceValue = -6, exponent = 6, radix = 16;
+        return (dec + Math.pow(radix, exponent))
+            .toString(radix)
+            .substr(decToHexSliceValue)
+            .replace(Utils.hexRepetitiveZerosRegExp, '');
     }
     static getRandomInteger(min, max) {
         return Math.floor(Math.random() * (max - min + 1)) + min;
@@ -37,8 +41,9 @@ class Utils {
         return obj;
     }
     static stringToUnicode(string) {
+        const radix = 16, unicodeSliceValue = -4;
         return `'${string.replace(/[\s\S]/g, (escape) => {
-            return `\\u${('0000' + escape.charCodeAt(0).toString(16)).slice(-4)}`;
+            return `\\u${('0000' + escape.charCodeAt(0).toString(radix)).slice(unicodeSliceValue)}`;
         })}'`;
     }
 }
diff --git a/dist/tests/dev-test.js b/dist/tests/dev-test.js
index c4a6ecb1..4cab2bc9 100644
--- a/dist/tests/dev-test.js
+++ b/dist/tests/dev-test.js
@@ -1,6 +1,4 @@
-"use strict";
-const JavaScriptObfuscator = require("../index");
-let obfuscatedCode = JavaScriptObfuscator.obfuscate(`
+let JavaScriptObfuscator = require('../index'), obfuscatedCode = JavaScriptObfuscator.obfuscate(`
     (function(){
         var result = 1,
             term1 = 0,
diff --git a/src/NodeUtils.ts b/src/NodeUtils.ts
index 89f9d815..b7d29d33 100644
--- a/src/NodeUtils.ts
+++ b/src/NodeUtils.ts
@@ -9,7 +9,7 @@ import { IPropertyNode } from "./interfaces/nodes/IPropertyNode";
 import { INode } from './interfaces/nodes/INode';
 import { IVariableDeclaratorNode } from "./interfaces/nodes/IVariableDeclaratorNode";
 
-import { BlockScopeNode } from "./types/BlockScopeNode";
+import { TBlockScopeNode } from "./types/TBlockScopeNode";
 
 import { NodeType } from "./enums/NodeType";
 
@@ -69,13 +69,13 @@ export class NodeUtils {
      * @param depth
      * @returns {INode}
      */
-    public static getBlockScopeOfNode (node: INode, depth: number = 0): BlockScopeNode {
+    public static getBlockScopeOfNode (node: INode, depth: number = 0): TBlockScopeNode {
         if (!node.parentNode) {
             throw new ReferenceError('`parentNode` property of given node is `undefined`');
         }
 
         if (node.parentNode.type === NodeType.Program) {
-            return <BlockScopeNode> node.parentNode;
+            return <TBlockScopeNode> node.parentNode;
         }
 
         if (!Utils.arrayContains(NodeUtils.scopeNodes, node.parentNode.type)) {
@@ -90,7 +90,7 @@ export class NodeUtils {
             return NodeUtils.getBlockScopeOfNode(node.parentNode);
         }
 
-        return <BlockScopeNode> node; // blocks statement of scopeNodes
+        return <TBlockScopeNode> node; // blocks statement of scopeNodes
     }
 
     /**
@@ -142,7 +142,7 @@ export class NodeUtils {
      * @param node
      * @returns {boolean}
      */
-    public static isNodeHasBlockScope (node: INode): node is BlockScopeNode {
+    public static isNodeHasBlockScope (node: INode): node is TBlockScopeNode {
         return node.hasOwnProperty('body');
     }
 
diff --git a/src/Obfuscator.ts b/src/Obfuscator.ts
index 673b15bc..90d8963a 100644
--- a/src/Obfuscator.ts
+++ b/src/Obfuscator.ts
@@ -1,11 +1,12 @@
 import * as estraverse from 'estraverse';
 
 import { ICustomNode } from './interfaces/ICustomNode';
-import { INodeObfuscator } from './interfaces/INodeObfuscator';
 import { INodesGroup } from './interfaces/INodesGroup';
 import { INode } from './interfaces/nodes/INode';
 import { IOptions } from "./interfaces/IOptions";
 
+import { TNodeObfuscator } from "./types/TNodeObfuscator";
+
 import { AppendState } from './enums/AppendState';
 import { NodeType } from './enums/NodeType';
 
@@ -29,9 +30,9 @@ export class Obfuscator {
     private nodes: Map <string, ICustomNode> = new Map <string, ICustomNode> ();
 
     /**
-     * @type {Map<string, Function[]>}
+     * @type {Map<string, TNodeObfuscator[]>}
      */
-    private nodeObfuscators: Map <string, Function[]> = new Map <string, Function[]> ([
+    private nodeObfuscators: Map <string, TNodeObfuscator[]> = new Map <string, TNodeObfuscator[]> ([
         [NodeType.ArrowFunctionExpression, [FunctionObfuscator]],
         [NodeType.ClassDeclaration, [FunctionDeclarationObfuscator]],
         [NodeType.CatchClause, [CatchClauseObfuscator]],
@@ -123,8 +124,8 @@ export class Obfuscator {
             return;
         }
 
-        this.nodeObfuscators.get(node.type).forEach((obfuscator: Function) => {
-            new (<INodeObfuscator> obfuscator(this.nodes, this.options)).obfuscateNode(node, parentNode);
+        this.nodeObfuscators.get(node.type).forEach((obfuscator: TNodeObfuscator) => {
+            new obfuscator(this.nodes, this.options).obfuscateNode(node, parentNode);
         });
     }
 
diff --git a/src/Utils.ts b/src/Utils.ts
index 0a934f36..95f008a2 100644
--- a/src/Utils.ts
+++ b/src/Utils.ts
@@ -17,15 +17,15 @@ export class Utils {
      * @param array
      * @param times
      * @param reverse
-     * @returns any[]
+     * @returns {T[]}
      */
-    public static arrayRotate (array: any[], times: number, reverse: boolean = false): any[] {
+    public static arrayRotate <T> (array: T[], times: number, reverse: boolean = false): T[] {
         if (times < 0) {
             return;
         }
 
-        let newArray: any[] = array,
-            temp: any;
+        let newArray: T[] = array,
+            temp: T;
 
         while (times--) {
             if (!reverse) {
@@ -45,7 +45,14 @@ export class Utils {
      * @returns {string}
      */
     public static decToHex(dec: number): string {
-        return (dec + Math.pow(16, 6)).toString(16).substr(-6).replace(Utils.hexRepetitiveZerosRegExp, '');
+        const decToHexSliceValue: number = -6,
+            exponent: number = 6,
+            radix: number = 16;
+
+        return (dec + Math.pow(radix, exponent))
+            .toString(radix)
+            .substr(decToHexSliceValue)
+            .replace(Utils.hexRepetitiveZerosRegExp, '');
     }
 
     /**
@@ -90,8 +97,11 @@ export class Utils {
      * @returns {string}
      */
     public static stringToUnicode (string: string): string {
+        const radix: number = 16,
+            unicodeSliceValue: number = -4;
+
         return `'${string.replace(/[\s\S]/g, (escape: string): string => {
-            return `\\u${('0000' + escape.charCodeAt(0).toString(16)).slice(-4)}`;
+            return `\\u${('0000' + escape.charCodeAt(0).toString(radix)).slice(unicodeSliceValue)}`;
         })}'`;
     }
 }
diff --git a/src/custom-nodes/console-output-nodes/ConsoleOutputDisableExpressionNode.ts b/src/custom-nodes/console-output-nodes/ConsoleOutputDisableExpressionNode.ts
index 0c6268b9..c704c5f1 100644
--- a/src/custom-nodes/console-output-nodes/ConsoleOutputDisableExpressionNode.ts
+++ b/src/custom-nodes/console-output-nodes/ConsoleOutputDisableExpressionNode.ts
@@ -1,6 +1,8 @@
 import * as esprima from 'esprima';
 
-import { BlockScopeNode } from "../../types/BlockScopeNode";
+import { INode } from "../../interfaces/nodes/INode";
+
+import { TBlockScopeNode } from "../../types/TBlockScopeNode";
 
 import { Node } from '../Node';
 import { NodeUtils } from "../../NodeUtils";
@@ -15,7 +17,7 @@ export class ConsoleOutputDisableExpressionNode extends Node {
     /**
      * @param blockScopeNode
      */
-    public appendNode (blockScopeNode: BlockScopeNode): void {
+    public appendNode (blockScopeNode: TBlockScopeNode): void {
         NodeUtils.prependNode(blockScopeNode.body, this.getNode());
     }
 
@@ -33,9 +35,9 @@ export class ConsoleOutputDisableExpressionNode extends Node {
      *  _console
      *  })();
      *
-     * @returns any
+     * @returns {INode}
      */
-    protected getNodeStructure (): any {
+    protected getNodeStructure (): INode {
         return NodeUtils.getBlockScopeNodeByIndex(
             esprima.parse(`
                 (function () {
diff --git a/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionCallNode.ts b/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionCallNode.ts
index e3e13851..f14d02f7 100644
--- a/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionCallNode.ts
+++ b/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionCallNode.ts
@@ -1,4 +1,6 @@
-import { BlockScopeNode } from "../../types/BlockScopeNode";
+import { IExpressionStatementNode } from "../../interfaces/nodes/IExpressionStatementNode";
+
+import { TBlockScopeNode } from "../../types/TBlockScopeNode";
 
 import { NodeType } from "../../enums/NodeType";
 
@@ -25,14 +27,14 @@ export class DebugProtectionFunctionCallNode extends Node {
     /**
      * @param blockScopeNode
      */
-    public appendNode (blockScopeNode: BlockScopeNode): void {
+    public appendNode (blockScopeNode: TBlockScopeNode): void {
         NodeUtils.appendNode(blockScopeNode.body, this.getNode());
     }
 
     /**
-     * @returns any
+     * @returns {IExpressionStatementNode}
      */
-    protected getNodeStructure (): any {
+    protected getNodeStructure (): IExpressionStatementNode {
         return {
             'type': NodeType.ExpressionStatement,
             'expression': {
diff --git a/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionIntervalNode.ts b/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionIntervalNode.ts
index 589c3392..173ff8b3 100644
--- a/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionIntervalNode.ts
+++ b/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionIntervalNode.ts
@@ -1,4 +1,6 @@
-import { BlockScopeNode } from "../../types/BlockScopeNode";
+import { IExpressionStatementNode } from "../../interfaces/nodes/IExpressionStatementNode";
+
+import { TBlockScopeNode } from "../../types/TBlockScopeNode";
 
 import { NodeType } from '../../enums/NodeType';
 
@@ -25,14 +27,14 @@ export class DebugProtectionFunctionIntervalNode extends Node {
     /**
      * @param blockScopeNode
      */
-    public appendNode (blockScopeNode: BlockScopeNode): void {
+    public appendNode (blockScopeNode: TBlockScopeNode): void {
         NodeUtils.appendNode(blockScopeNode.body, this.getNode());
     }
 
     /**
-     * @returns any
+     * @returns {IExpressionStatementNode}
      */
-    protected getNodeStructure (): any {
+    protected getNodeStructure (): IExpressionStatementNode {
         return {
             'type': NodeType.ExpressionStatement,
             'expression': {
diff --git a/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionNode.ts b/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionNode.ts
index 0cb3436e..d95dcbd0 100644
--- a/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionNode.ts
+++ b/src/custom-nodes/debug-protection-nodes/DebugProtectionFunctionNode.ts
@@ -1,6 +1,8 @@
 import * as esprima from 'esprima';
 
-import { BlockScopeNode } from "../../types/BlockScopeNode";
+import { INode } from "../../interfaces/nodes/INode";
+
+import { TBlockScopeNode } from "../../types/TBlockScopeNode";
 
 import { Node } from '../Node';
 import { NodeUtils } from '../../NodeUtils';
@@ -28,7 +30,7 @@ export class DebugProtectionFunctionNode extends Node {
     /**
      * @param blockScopeNode
      */
-    public appendNode (blockScopeNode: BlockScopeNode): void {
+    public appendNode (blockScopeNode: TBlockScopeNode): void {
         let programBodyLength: number = blockScopeNode.body.length,
             randomIndex: number = Utils.getRandomInteger(0, programBodyLength);
 
@@ -45,9 +47,9 @@ export class DebugProtectionFunctionNode extends Node {
     /**
      * Found this trick in JScrambler
      *
-     * @returns any
+     * @returns {INode}
      */
-    protected getNodeStructure (): any {
+    protected getNodeStructure (): INode {
         return NodeUtils.getBlockScopeNodeByIndex(
             esprima.parse(`
                 var ${this.debugProtectionFunctionName} = function () {
diff --git a/src/custom-nodes/unicode-array-nodes/UnicodeArrayCallsWrapper.ts b/src/custom-nodes/unicode-array-nodes/UnicodeArrayCallsWrapper.ts
index aa7c9ba1..08b84b47 100644
--- a/src/custom-nodes/unicode-array-nodes/UnicodeArrayCallsWrapper.ts
+++ b/src/custom-nodes/unicode-array-nodes/UnicodeArrayCallsWrapper.ts
@@ -2,7 +2,7 @@ import * as esprima from 'esprima';
 
 import { INode } from "../../interfaces/nodes/INode";
 
-import { BlockScopeNode } from "../../types/BlockScopeNode";
+import { TBlockScopeNode } from "../../types/TBlockScopeNode";
 
 import { AppendState } from "../../enums/AppendState";
 
@@ -53,7 +53,7 @@ export class UnicodeArrayCallsWrapper extends Node {
     /**
      * @param blockScopeNode
      */
-    public appendNode (blockScopeNode: BlockScopeNode): void {
+    public appendNode (blockScopeNode: TBlockScopeNode): void {
         NodeUtils.insertNodeAtIndex(blockScopeNode.body, this.getNode(), 1);
     }
 
@@ -76,9 +76,9 @@ export class UnicodeArrayCallsWrapper extends Node {
     }
 
     /**
-     * @returns any
+     * @returns {INode}
      */
-    protected getNodeStructure (): any {
+    protected getNodeStructure (): INode {
         let keyName: string = Utils.getRandomVariableName(),
             node: INode = esprima.parse(`
                 var ${this.unicodeArrayCallsWrapperName} = function (${keyName}) {
diff --git a/src/custom-nodes/unicode-array-nodes/UnicodeArrayNode.ts b/src/custom-nodes/unicode-array-nodes/UnicodeArrayNode.ts
index 1a0e469f..655c6f40 100644
--- a/src/custom-nodes/unicode-array-nodes/UnicodeArrayNode.ts
+++ b/src/custom-nodes/unicode-array-nodes/UnicodeArrayNode.ts
@@ -2,7 +2,7 @@ import * as escodegen from 'escodegen';
 
 import { INode } from '../../interfaces/nodes/INode';
 
-import { BlockScopeNode } from "../../types/BlockScopeNode";
+import { TBlockScopeNode } from "../../types/TBlockScopeNode";
 
 import { AppendState } from '../../enums/AppendState';
 import { NodeType } from "../../enums/NodeType";
@@ -10,6 +10,7 @@ import { NodeType } from "../../enums/NodeType";
 import { Node } from '../Node';
 import { NodeUtils } from "../../NodeUtils";
 import { Utils } from '../../Utils';
+import {IVariableDeclarationNode} from "../../interfaces/nodes/IVariableDeclarationNode";
 
 export class UnicodeArrayNode extends Node {
     /**
@@ -53,7 +54,7 @@ export class UnicodeArrayNode extends Node {
     /**
      * @param blockScopeNode
      */
-    public appendNode (blockScopeNode: BlockScopeNode): void {
+    public appendNode (blockScopeNode: TBlockScopeNode): void {
         NodeUtils.prependNode(blockScopeNode.body, this.getNode());
     }
 
@@ -79,7 +80,7 @@ export class UnicodeArrayNode extends Node {
             return;
         }
 
-        Utils.arrayRotate(this.unicodeArray, this.unicodeArrayRotateValue);
+        Utils.arrayRotate <string> (this.unicodeArray, this.unicodeArrayRotateValue);
 
         this.updateNode();
 
@@ -87,9 +88,9 @@ export class UnicodeArrayNode extends Node {
     }
 
     /**
-     * @returns any
+     * @returns {INode}
      */
-    protected getNodeStructure (): any {
+    protected getNodeStructure (): IVariableDeclarationNode {
         return {
             'type': NodeType.VariableDeclaration,
             'declarations': [
diff --git a/src/custom-nodes/unicode-array-nodes/UnicodeArrayRotateFunctionNode.ts b/src/custom-nodes/unicode-array-nodes/UnicodeArrayRotateFunctionNode.ts
index 1237287a..5be83b3d 100644
--- a/src/custom-nodes/unicode-array-nodes/UnicodeArrayRotateFunctionNode.ts
+++ b/src/custom-nodes/unicode-array-nodes/UnicodeArrayRotateFunctionNode.ts
@@ -2,7 +2,7 @@ import * as esprima from 'esprima';
 
 import { INode } from "../../interfaces/nodes/INode";
 
-import { BlockScopeNode } from "../../types/BlockScopeNode";
+import { TBlockScopeNode } from "../../types/TBlockScopeNode";
 
 import { AppendState } from "../../enums/AppendState";
 
@@ -53,7 +53,7 @@ export class UnicodeArrayRotateFunctionNode extends Node {
     /**
      * @param blockScopeNode
      */
-    public appendNode (blockScopeNode: BlockScopeNode): void {
+    public appendNode (blockScopeNode: TBlockScopeNode): void {
         NodeUtils.insertNodeAtIndex(blockScopeNode.body, this.getNode(), 1);
     }
 
@@ -69,9 +69,9 @@ export class UnicodeArrayRotateFunctionNode extends Node {
     }
 
     /**
-     * @returns any
+     * @returns {INode}
      */
-    protected getNodeStructure (): any {
+    protected getNodeStructure (): INode {
         let arrayName: string = Utils.getRandomVariableName(),
             timesName: string = Utils.getRandomVariableName(),
             tempArrayName: string = Utils.getRandomVariableName(),
diff --git a/src/interfaces/IOptions.d.ts b/src/interfaces/IOptions.d.ts
index c28444fa..0cf38876 100644
--- a/src/interfaces/IOptions.d.ts
+++ b/src/interfaces/IOptions.d.ts
@@ -5,5 +5,4 @@ export interface IOptions {
     disableConsoleOutput?: boolean;
     rotateUnicodeArray?: boolean;
     wrapUnicodeArrayCalls?: boolean;
-    [id: string]: any;
 }
diff --git a/src/interfaces/nodes/IExpressionStatementNode.d.ts b/src/interfaces/nodes/IExpressionStatementNode.d.ts
new file mode 100644
index 00000000..7774ac1d
--- /dev/null
+++ b/src/interfaces/nodes/IExpressionStatementNode.d.ts
@@ -0,0 +1,5 @@
+import { INode } from "./INode";
+
+export interface IExpressionStatementNode extends INode {
+    expression: any;
+}
diff --git a/src/types/BlockScopeNode.d.ts b/src/types/TBlockScopeNode.d.ts
similarity index 75%
rename from src/types/BlockScopeNode.d.ts
rename to src/types/TBlockScopeNode.d.ts
index b463d6a2..6723bc78 100644
--- a/src/types/BlockScopeNode.d.ts
+++ b/src/types/TBlockScopeNode.d.ts
@@ -3,4 +3,4 @@ import { ICatchClauseNode } from "../interfaces/nodes/ICatchClauseNode";
 import { IFunctionNode } from "../interfaces/nodes/IFunctionNode";
 import { IProgramNode } from "../interfaces/nodes/IProgramNode";
 
-export type BlockScopeNode = IBlockStatementNode|ICatchClauseNode|IFunctionNode|IProgramNode;
\ No newline at end of file
+export type TBlockScopeNode = IBlockStatementNode|ICatchClauseNode|IFunctionNode|IProgramNode;
\ No newline at end of file
diff --git a/src/types/TNodeObfuscator.d.ts b/src/types/TNodeObfuscator.d.ts
new file mode 100644
index 00000000..92462034
--- /dev/null
+++ b/src/types/TNodeObfuscator.d.ts
@@ -0,0 +1,5 @@
+import { ICustomNode } from "../interfaces/ICustomNode";
+import { INodeObfuscator } from "../interfaces/INodeObfuscator";
+import { IOptions } from "../interfaces/IOptions";
+
+export type TNodeObfuscator =  (new (nodes: Map <string, ICustomNode>, options: IOptions) => INodeObfuscator);
\ No newline at end of file
diff --git a/tests/dev-test.ts b/tests/dev-test.ts
index 4352d5c4..5cded573 100644
--- a/tests/dev-test.ts
+++ b/tests/dev-test.ts
@@ -1,6 +1,5 @@
-import * as JavaScriptObfuscator from "../index";
-
-let obfuscatedCode: string = (<any>JavaScriptObfuscator).obfuscate(
+let JavaScriptObfuscator = require('../index'),
+    obfuscatedCode: string = JavaScriptObfuscator.obfuscate(
     `
     (function(){
         var result = 1,