diff --git a/.babelrc b/.babelrc
deleted file mode 100644
index 2169c01..0000000
--- a/.babelrc
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "presets": ["env"],
-  "plugins": [
-    ["babel-plugin-transform-builtin-extend", {
-      "globals": ["Error", "Array"]
-    }],
-    "transform-class-properties"
-  ]
-}
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..a4f2817
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,16 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+tab_width = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 120
+
+[*.html]
+indent_size = 4
+tab_width = 4
+max_line_length = off
diff --git a/.eslintrc.json b/.eslintrc.json
index 44b5a80..b5b507e 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,10 +1,14 @@
 {
-  "extends": "airbnb-base",
   "env": {
+    "es6": true,
     "node": true,
     "jest": true
   },
   "rules": {
-    "comma-dangle": ["error", "never"]
+    "comma-dangle": ["error", "never"],
+    "prefer-const": "error",
+    "no-trailing-spaces": "error",
+    "semi": "error",
+    "indent": ["error", 2]
   }
 }
diff --git a/.gitignore b/.gitignore
index e3c3649..597eb1c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /node_modules/
 .idea/
+.nyc_output
\ No newline at end of file
diff --git a/index.js b/index.js
deleted file mode 100644
index ce89d4e..0000000
--- a/index.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require('./src/logic-tree');
diff --git a/package-lock.json b/package-lock.json
index daff49f..e54f61e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,2005 +4,1552 @@
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-      "dev": true
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-    "acorn-jsx": {
-      "version": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
-      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+    "@babel/code-frame": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
+      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
       "dev": true,
       "requires": {
-        "acorn": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
-        }
+        "@babel/highlight": "^7.0.0"
       }
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-    "ajv": {
-      "version": "https://registry.npmjs.org/ajv/-/ajv-5.5.1.tgz",
-      "integrity": "sha1-s4u4h22ehr7plJVqBOch6IskjrI=",
+    "@babel/generator": {
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+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.4.tgz",
+      "integrity": "sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==",
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-        "fast-deep-equal": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.0.0.tgz",
-        "fast-json-stable-stringify": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz",
-        "json-schema-traverse": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.3.1.tgz"
+        "@babel/types": "^7.4.4",
+        "jsesc": "^2.5.1",
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 }
diff --git a/package.json b/package.json
index 7695072..46f15fb 100644
--- a/package.json
+++ b/package.json
@@ -8,25 +8,23 @@
     "parser",
     "tree"
   ],
-  "main": "index.js",
+  "main": "src/index.js",
   "scripts": {
-    "test": "mocha --require babel-register test",
-    "lint": "eslint src/**/*.js"
+    "test": "mocha test",
+    "test:coverage": "nyc mocha test",
+    "lint": "eslint src/**/*.js",
+    "lint:fix": "npm run lint -- --fix"
   },
   "author": "Ivan Reyvart",
-  "license": "Apache-2.0",
+  "license": "MIT",
   "devDependencies": {
-    "babel-cli": "^6.26.0",
-    "babel-plugin-transform-builtin-extend": "^1.1.2",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-preset-env": "^1.6.1",
-    "chai": "^4.1.2",
-    "eslint": "^4.12.0",
-    "eslint-config-airbnb-base": "^12.1.0",
-    "eslint-plugin-import": "^2.8.0",
-    "mocha": "^4.0.1"
+    "chai": "^4.2.0",
+    "eslint": "^5.16.0",
+    "eslint-config-airbnb-base": "^13.1.0",
+    "mocha": "^6.1.4",
+    "nyc": "^14.1.1"
   },
   "dependencies": {
-    "ramda": "^0.25.0"
+    "ramda": "^0.26.1"
   }
 }
diff --git a/src/bracket-tree.js b/src/bracket-tree.js
index 618a7a8..eb89271 100644
--- a/src/bracket-tree.js
+++ b/src/bracket-tree.js
@@ -11,8 +11,6 @@ class TreeNode {
       writable: false,
       value: () => parentNode
     });
-
-    // getParent: (cn => cn).bind(null, currentNode)
   }
 }
 
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..0c4d722
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,7 @@
+const LogicTree = require('./logic-tree');
+const BracketTree = require('./bracket-tree');
+
+module.exports = {
+  LogicTree,
+  BracketTree
+};
diff --git a/src/logic-tree.js b/src/logic-tree.js
index 3b0b34d..c9dfc40 100644
--- a/src/logic-tree.js
+++ b/src/logic-tree.js
@@ -30,7 +30,6 @@ const findAssociative = (rootParamName, treeNodes) => {
 };
 
 class LogicTree {
-
   constructor(treeNodes, rootParam) {
     this.nodes = treeNodes;
     this.rootParam = rootParam;
diff --git a/src/parser.js b/src/parser.js
index 58082c5..083edc3 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -12,7 +12,6 @@ priorities.set(tokens.names.AND, 10);
 priorities.set(tokens.names.OR, 5);
 
 class Parser {
-
   constructor(tokens) {
     this.tokens = tokens;
     this.current = 0;
@@ -64,8 +63,8 @@ class Parser {
 
     this.next();
 
-    let left = this.contextTree;
-    let right = this.parseByToken(nextToken);
+    const left = this.contextTree;
+    const right = this.parseByToken(nextToken);
 
     if (left instanceof BinaryExpression) {
       if (priorities.get(left.token.name) < priorities.get(token.name)) {
@@ -99,7 +98,7 @@ class Parser {
        * TODO: think about Iterator
        */
       let currentPosition = this.current;
-      let subTokens = [];
+      const subTokens = [];
       while (currentPosition < this.tokens.length) {
         const token = this.peek(currentPosition - this.current);
 
diff --git a/src/tokenizer.js b/src/tokenizer.js
index baaa7e2..89a229b 100644
--- a/src/tokenizer.js
+++ b/src/tokenizer.js
@@ -2,7 +2,6 @@ const head = require('ramda/src/head');
 const tokens = require('./tokens');
 
 class Tokenizer {
-
   /**
    * @param text {string} - source code
    * @param config {Object?}
diff --git a/src/types/binary-expression.js b/src/types/binary-expression.js
index dc7030f..b4d81ee 100644
--- a/src/types/binary-expression.js
+++ b/src/types/binary-expression.js
@@ -1,7 +1,4 @@
 class BinaryExpression {
-
-  static type = 'BinaryExpression';
-
   constructor(token, params) {
     this.token = token;
     this.type = BinaryExpression.type;
@@ -20,4 +17,6 @@ class BinaryExpression {
   }
 }
 
+BinaryExpression.type = 'BinaryExpression';
+
 module.exports = BinaryExpression;
diff --git a/src/types/identifier.js b/src/types/identifier.js
index b6e91ea..b5d3364 100644
--- a/src/types/identifier.js
+++ b/src/types/identifier.js
@@ -1,7 +1,4 @@
 class Identifier {
-
-  static type = 'Identifier';
-
   constructor(token) {
     this.type = Identifier.type;
     this.name = token.value;
@@ -15,4 +12,6 @@ class Identifier {
   }
 }
 
+Identifier.type = 'Identifier';
+
 module.exports = Identifier;
diff --git a/src/types/unary-expression.js b/src/types/unary-expression.js
index 2a01f4d..ac65211 100644
--- a/src/types/unary-expression.js
+++ b/src/types/unary-expression.js
@@ -1,7 +1,4 @@
 class UnaryExpression {
-
-  static type = 'UnaryExpression';
-
   constructor(token, value) {
     this.type = UnaryExpression.type;
     this.name = token.value;
@@ -17,4 +14,6 @@ class UnaryExpression {
   }
 }
 
+UnaryExpression.type = 'UnaryExpression';
+
 module.exports = UnaryExpression;
diff --git a/src/unexpected-end-of-line-exception.js b/src/unexpected-end-of-line-exception.js
index cf85bce..b89311b 100644
--- a/src/unexpected-end-of-line-exception.js
+++ b/src/unexpected-end-of-line-exception.js
@@ -1,5 +1,4 @@
 class UnexpectedEndOfLineException extends Error {
-
   constructor(expectedNames) {
     super();
 
diff --git a/src/unexpected-token-exception.js b/src/unexpected-token-exception.js
index afcaff7..0c62860 100644
--- a/src/unexpected-token-exception.js
+++ b/src/unexpected-token-exception.js
@@ -1,5 +1,4 @@
 class UnexpectedTokenException extends Error {
-
   constructor(token) {
     super();
     this.message = `Unexpected token at column: ${token.position}`;