diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000..2e9ea972
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,3 @@
+[*.{js, ts}]
+indent_style = space
+indent_size = 2
\ No newline at end of file
diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 00000000..33fc96e2
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,4 @@
+lib
+node_modules
+coverage
+/*.*
\ No newline at end of file
diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 00000000..218ed932
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,16 @@
+module.exports = {
+  env: {
+    node: true
+  },
+  parser:  '@typescript-eslint/parser',
+  extends: [
+    "eslint:recommended",
+    "plugin:prettier/recommended",
+    "plugin:jest/recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/eslint-recommended"
+  ],
+  parserOptions: {
+    sourceType: "module"
+  }
+};
diff --git a/.gitignore b/.gitignore
index a9e59726..dec06869 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,11 @@
 # IDEA
 .idea
 
-# Build folder
-/dist
-
 # Lib folder
 /lib
 
 # npm modules
-/node_modules
\ No newline at end of file
+/node_modules
+
+# Tests coverage results
+/coverage
\ No newline at end of file
diff --git a/.prettierrc.js b/.prettierrc.js
new file mode 100644
index 00000000..1ffd35cf
--- /dev/null
+++ b/.prettierrc.js
@@ -0,0 +1,7 @@
+module.exports = {
+  semi: true,
+  trailingComma: "none",
+  singleQuote: false,
+  printWidth: 120,
+  tabWidth: 2
+};
diff --git a/README.md b/README.md
index 2410fd69..1e8153cf 100644
--- a/README.md
+++ b/README.md
@@ -3,11 +3,12 @@
 
 JavaScript library for generating QR codes with a logo and styling.
 
+If you have issues / suggestions / notes / questions, please make a pull request or contact me. Let's create a usable library together.
 ### Examples
 <p float="left">
-<img style="display:inline-block" src="https://raw.githubusercontent.com/kozakdenys/qr-code-styling/master/app/assets/facebook_example.png" width="240" />
-<img style="display:inline-block" src="https://raw.githubusercontent.com/kozakdenys/qr-code-styling/master/app/assets/instagram_example.png" width="240" />
-<img style="display:inline-block" src="https://raw.githubusercontent.com/kozakdenys/qr-code-styling/master/app/assets/telegram_example.png" width="240" />
+<img style="display:inline-block" src="https://raw.githubusercontent.com/kozakdenys/qr-code-styling/master/src/assets/facebook_example.png" width="240" />
+<img style="display:inline-block" src="https://raw.githubusercontent.com/kozakdenys/qr-code-styling/master/src/assets/instagram_example.png" width="240" />
+<img style="display:inline-block" src="https://raw.githubusercontent.com/kozakdenys/qr-code-styling/master/src/assets/telegram_example.png" width="240" />
 </p>
 
 ### Installation
@@ -30,7 +31,7 @@ npm install qr-code-styling
 <div id="canvas"></div>
 <script type="text/javascript">
 
-    const qrCode = new QrCodeStyling({
+    const qrCode = new QRCodeStyling({
         width: 300,
         height: 300,
         data: "https://www.facebook.com/",
@@ -52,8 +53,8 @@ npm install qr-code-styling
 
 ### API Documentation
 
-#### QrCodeStyling instance
-`new QrCodeStyling(options) => QrCodeStyling`
+#### QRCodeStyling instance
+`new QRCodeStyling(options) => QRCodeStyling`
 
 Param  |Type  |Description
 -------|------|------------
@@ -100,19 +101,25 @@ Property|Type  |Default Value
 --------|------|-------------
 color  |string|`'#fff'`
 
-#### QrCodeStyling methods
-`QrCodeStyling.append(container) => void`
+#### QRCodeStyling methods
+`QRCodeStyling.append(container) => void`
 
 Param    |Type       |Description
 ---------|-----------|-----------
 container|DOM element|This container will be used for appending of the QR code
 
-`QrCodeStyling.update(options) => void`
+`QRCodeStyling.update(options) => void`
 
 Param  |Type  |Description
 -------|------|--------------------------------------
 options|object|The same options as for initialization
 
+`QRCodeStyling.download(extension) => void`
+
+Param    |Type                          |Default Value
+---------|------------------------------|-------------
+extension|string (`'png' 'jpeg' 'webp'`)|`'png'`
+
 ### License
 
 [MIT License](https://raw.githubusercontent.com/kozakdenys/qr-code-styling/master/LICENSE). Copyright (c) 2019 Denys Kozak
diff --git a/_config.yml b/_config.yml
deleted file mode 100644
index 3397c9a4..00000000
--- a/_config.yml
+++ /dev/null
@@ -1 +0,0 @@
-theme: jekyll-theme-architect
\ No newline at end of file
diff --git a/app/assets/fb_logo.png b/app/assets/fb_logo.png
deleted file mode 100644
index b386bb10..00000000
Binary files a/app/assets/fb_logo.png and /dev/null differ
diff --git a/app/assets/fb_logo_resized.png b/app/assets/fb_logo_resized.png
deleted file mode 100644
index b258a6c0..00000000
Binary files a/app/assets/fb_logo_resized.png and /dev/null differ
diff --git a/app/assets/instagram.png b/app/assets/instagram.png
deleted file mode 100644
index c8bcc39c..00000000
Binary files a/app/assets/instagram.png and /dev/null differ
diff --git a/app/assets/telegram.png b/app/assets/telegram.png
deleted file mode 100644
index 16c408b2..00000000
Binary files a/app/assets/telegram.png and /dev/null differ
diff --git a/app/assets/youtube.png b/app/assets/youtube.png
deleted file mode 100644
index f88fdb22..00000000
Binary files a/app/assets/youtube.png and /dev/null differ
diff --git a/app/index.html b/app/index.html
deleted file mode 100644
index b8226f86..00000000
--- a/app/index.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <title>Title</title>
-</head>
-<body>
-    <div id="canvas"></div>
-</body>
-</html>
\ No newline at end of file
diff --git a/app/index.js b/app/index.js
deleted file mode 100644
index 8926126a..00000000
--- a/app/index.js
+++ /dev/null
@@ -1,26 +0,0 @@
-import QrCodeStyling from "qr-code-styling";
-import logo from "./assets/fb_logo.png";
-
-const qrCode = new QrCodeStyling({
-    width: 300,
-    height: 300,
-    data: "https://www.facebook.com/",
-    image: logo,
-    qrOptions: {
-        // typeNumber: 10,
-        // errorCorrectionLevel: "H",
-    },
-    imageOptions: {
-        hideBackgroundDots: true,
-        imageSize: 0.4
-    },
-    dotsOptions: {
-        color: "#4267b2",
-        style: "dots"
-    },
-    backgroundOptions: {
-        color: "#e9ebee",
-    }
-});
-
-qrCode.append(document.getElementById("canvas"));
\ No newline at end of file
diff --git a/configs/webpack.config.app.js b/configs/webpack.config.app.js
deleted file mode 100644
index d1db4301..00000000
--- a/configs/webpack.config.app.js
+++ /dev/null
@@ -1,55 +0,0 @@
-const path = require("path");
-const HtmlWebpackPlugin = require("html-webpack-plugin");
-const { CleanWebpackPlugin } = require("clean-webpack-plugin");
-
-const rootPath = path.resolve(__dirname, "./..");
-const srcPath = path.resolve(rootPath, "src");
-const appPath = path.resolve(rootPath, "app");
-const distPath = path.resolve(rootPath, "dist");
-
-const config = {
-    entry: appPath + "/index.js",
-    output: {
-        path: distPath,
-        filename: 'index.js'
-    },
-    module: {
-        rules: [
-            {
-                test: /\.js$/,
-                include: appPath,
-                loader: "babel-loader"
-            },
-            {
-                test: /\.(png|jpe?g|gif)$/i,
-                include: appPath,
-                loader: "file-loader",
-            },
-        ]
-    },
-    plugins: [
-        new CleanWebpackPlugin(),
-        new HtmlWebpackPlugin({
-            template: appPath + "/index.html",
-        })
-    ],
-    resolve: {
-        alias: {
-            "qr-code-styling": srcPath + "/index.js",
-        }
-    }
-};
-
-module.exports = (env, argv) => {
-    if (argv.mode === "development") {
-        config.devtool = "inline-source-map";
-        config.mode = argv.mode;
-    }
-
-    if (argv.mode === "production") {
-        config.devtool = "source-map";
-        config.mode = argv.mode;
-    }
-
-    return config;
-};
\ No newline at end of file
diff --git a/configs/webpack.config.lib.js b/configs/webpack.config.lib.js
deleted file mode 100644
index 5a1718af..00000000
--- a/configs/webpack.config.lib.js
+++ /dev/null
@@ -1,44 +0,0 @@
-const path = require("path");
-const { CleanWebpackPlugin } = require("clean-webpack-plugin");
-
-const rootPath = path.resolve(__dirname, "./..");
-const srcPath = path.resolve(rootPath, "src");
-const libPath = path.resolve(rootPath, "lib");
-const appPath = path.resolve(rootPath, "app");
-
-const config = {
-    entry: srcPath + "/index.js",
-    output: {
-        path: libPath,
-        filename: "qr-code-styling.js",
-        library: "QrCodeStyling",
-        libraryTarget: "umd",
-        libraryExport: "default"
-    },
-    module: {
-        rules: [
-            {
-                test: /\.js$/,
-                include: appPath,
-                loader: "babel-loader"
-            }
-        ]
-    },
-    plugins: [
-        new CleanWebpackPlugin()
-    ]
-};
-
-module.exports = (env, argv) => {
-    if (argv.mode === "development") {
-        config.devtool = "inline-source-map";
-        config.mode = argv.mode;
-    }
-
-    if (argv.mode === "production") {
-        config.devtool = "source-map";
-        config.mode = argv.mode;
-    }
-
-    return config;
-};
\ No newline at end of file
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 00000000..196db6ca
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,185 @@
+const { defaults: tsjPreset } = require("ts-jest/presets");
+
+// For a detailed explanation regarding each configuration property, visit:
+// https://jestjs.io/docs/en/configuration.html
+
+module.exports = {
+  // All imported modules in your tests should be mocked automatically
+  // automock: false,
+
+  // Stop running tests after `n` failures
+  // bail: 0,
+
+  // Respect "browser" field in package.json when resolving modules
+  // browser: false,
+
+  // The directory where Jest should store its cached dependency information
+  // cacheDirectory: "/tmp/jest_rs",
+
+  // Automatically clear mock calls and instances between every test
+  // clearMocks: false,
+
+  // Indicates whether the coverage information should be collected while executing the test
+  collectCoverage: true,
+
+  // An array of glob patterns indicating a set of files for which coverage information should be collected
+  collectCoverageFrom: ["src/**/*.ts", "!src/**/*.d.ts"],
+
+  // The directory where Jest should output its coverage files
+  coverageDirectory: "coverage",
+
+  // An array of regexp pattern strings used to skip coverage collection
+  // coveragePathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  // coverageReporters: [
+  //   "json",
+  //   "text",
+  //   "lcov",
+  //   "clover"
+  // ],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  // coverageThreshold: null,
+
+  // A path to a custom dependency extractor
+  // dependencyExtractor: null,
+
+  // Make calling deprecated APIs throw helpful error messages
+  // errorOnDeprecated: false,
+
+  // Force coverage collection from ignored files using an array of glob patterns
+  // forceCoverageMatch: [],
+
+  // A path to a module which exports an async function that is triggered once before all test suites
+  // globalSetup: null,
+
+  // A path to a module which exports an async function that is triggered once after all test suites
+  // globalTeardown: null,
+
+  // A set of global variables that need to be available in all test environments
+  // globals: {},
+
+  // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
+  // maxWorkers: "50%",
+
+  // An array of directory names to be searched recursively up from the requiring module's location
+  // moduleDirectories: [
+  //   "node_modules"
+  // ],
+
+  // An array of file extensions your modules use
+  moduleFileExtensions: ["ts", "js", "json"],
+
+  // A map from regular expressions to module names that allow to stub out resources with a single module
+  // moduleNameMapper: {},
+
+  // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+  // modulePathIgnorePatterns: [],
+
+  // Activates notifications for test results
+  // notify: false,
+
+  // An enum that specifies notification mode. Requires { notify: true }
+  // notifyMode: "failure-change",
+
+  // A preset that is used as a base for Jest's configuration
+  preset: "ts-jest",
+
+  // Run tests from one or more projects
+  // projects: null,
+
+  // Use this configuration option to add custom reporters to Jest
+  // reporters: undefined,
+
+  // Automatically reset mock state between every test
+  // resetMocks: false,
+
+  // Reset the module registry before running each individual test
+  // resetModules: false,
+
+  // A path to a custom resolver
+  // resolver: null,
+
+  // Automatically restore mock state between every test
+  // restoreMocks: false,
+
+  // The root directory that Jest should scan for tests and modules within
+  // rootDir: null,
+
+  // A list of paths to directories that Jest should use to search for files in
+  roots: ["src"],
+
+  // Allows you to use a custom runner instead of Jest's default test runner
+  // runner: "jest-runner",
+
+  // The paths to modules that run some code to configure or set up the testing environment before each test
+  // setupFiles: [],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  // setupFilesAfterEnv: [],
+
+  // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+  // snapshotSerializers: [],
+
+  // The test environment that will be used for testing
+  testEnvironment: "jest-environment-jsdom-fifteen",
+
+  // Options that will be passed to the testEnvironment
+  testEnvironmentOptions: {
+    resources: "usable"
+  },
+
+  // Adds a location field to test results
+  // testLocationInResults: false,
+
+  // The glob patterns Jest uses to detect test files
+  // testMatch: [
+  //   "**/__tests__/**/*.[jt]s?(x)",
+  //   "**/?(*.)+(spec|test).[tj]s?(x)"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  // testPathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // The regexp pattern or array of patterns that Jest uses to detect test files
+  // testRegex: [],
+
+  // This option allows the use of a custom results processor
+  // testResultsProcessor: null,
+
+  // This option allows use of a custom test runner
+  // testRunner: "jasmine2",
+
+  // This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
+  // testURL: "http://localhost",
+
+  // Setting this value to "fake" allows the use of fake timers for functions such as "setTimeout"
+  // timers: "real",
+
+  // A map from regular expressions to paths to transformers
+  transform: {
+    "^.+\\.(js|ts)$": "ts-jest"
+  }
+
+  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+  // transformIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+  // unmockedModulePathPatterns: undefined,
+
+  // Indicates whether each individual test should be reported during the run
+  // verbose: null,
+
+  // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+  // watchPathIgnorePatterns: [],
+
+  // Whether to use watchman for file crawling
+  // watchman: true,
+};
diff --git a/package-lock.json b/package-lock.json
index 4830dbdc..90f5a39a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "qr-code-styling",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -94,6 +94,12 @@
         "@babel/types": "^7.0.0"
       }
     },
+    "@babel/helper-plugin-utils": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz",
+      "integrity": "sha512-CYAOUCARwExnEixLdB6sDm2dIJ/YgEAKDM1MOeMeZu9Ld/bDgVo8aiWrXwcY7OBh+1Ea2uUcVRcxKk0GJvW7QA==",
+      "dev": true
+    },
     "@babel/helper-split-export-declaration": {
       "version": "7.4.4",
       "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
@@ -131,6 +137,15 @@
       "integrity": "sha512-E5BN68cqR7dhKan1SfqgPGhQ178bkVKpXTPEXnFJBrEt8/DKRZlybmy+IgYLTeN7tp1R5Ccmbm2rBk17sHYU3g==",
       "dev": true
     },
+    "@babel/plugin-syntax-object-rest-spread": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-object-rest-spread/-/plugin-syntax-object-rest-spread-7.2.0.tgz",
+      "integrity": "sha512-t0JKGgqk2We+9may3t0xDdmneaXmyxq0xieYcKHxIsrJO64n1OiMWNUtc5gQK1PA0NpdCRrtZp4z+IUaKugrSA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.0.0"
+      }
+    },
     "@babel/template": {
       "version": "7.4.4",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
@@ -187,12 +202,261 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@cnakazawa/watch": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@cnakazawa/watch/-/watch-1.0.3.tgz",
+      "integrity": "sha512-r5160ogAvGyHsal38Kux7YYtodEKOj89RGb28ht1jh3SJb08VwRwAKKJL0bGb04Zd/3r9FL3BFIc3bBidYffCA==",
+      "dev": true,
+      "requires": {
+        "exec-sh": "^0.3.2",
+        "minimist": "^1.2.0"
+      }
+    },
+    "@jest/console": {
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/console/-/console-24.9.0.tgz",
+      "integrity": "sha512-Zuj6b8TnKXi3q4ymac8EQfc3ea/uhLeCGThFqXeC8H9/raaH8ARPUTdId+XyGd03Z4In0/VjD2OYFcBF09fNLQ==",
+      "dev": true,
+      "requires": {
+        "@jest/source-map": "^24.9.0",
+        "chalk": "^2.0.1",
+        "slash": "^2.0.0"
+      }
+    },
+    "@jest/core": {
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/core/-/core-24.9.0.tgz",
+      "integrity": "sha512-Fogg3s4wlAr1VX7q+rhV9RVnUv5tD7VuWfYy1+whMiWUrvl7U3QJSJyWcDio9Lq2prqYsZaeTv2Rz24pWGkJ2A==",
+      "dev": true,
+      "requires": {
+        "@jest/console": "^24.7.1",
+        "@jest/reporters": "^24.9.0",
+        "@jest/test-result": "^24.9.0",
+        "@jest/transform": "^24.9.0",
+        "@jest/types": "^24.9.0",
+        "ansi-escapes": "^3.0.0",
+        "chalk": "^2.0.1",
+        "exit": "^0.1.2",
+        "graceful-fs": "^4.1.15",
+        "jest-changed-files": "^24.9.0",
+        "jest-config": "^24.9.0",
+        "jest-haste-map": "^24.9.0",
+        "jest-message-util": "^24.9.0",
+        "jest-regex-util": "^24.3.0",
+        "jest-resolve": "^24.9.0",
+        "jest-resolve-dependencies": "^24.9.0",
+        "jest-runner": "^24.9.0",
+        "jest-runtime": "^24.9.0",
+        "jest-snapshot": "^24.9.0",
+        "jest-util": "^24.9.0",
+        "jest-validate": "^24.9.0",
+        "jest-watcher": "^24.9.0",
+        "micromatch": "^3.1.10",
+        "p-each-series": "^1.0.0",
+        "realpath-native": "^1.1.0",
+        "rimraf": "^2.5.4",
+        "slash": "^2.0.0",
+        "strip-ansi": "^5.0.0"
+      }
+    },
+    "@jest/environment": {
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/environment/-/environment-24.9.0.tgz",
+      "integrity": "sha512-5A1QluTPhvdIPFYnO3sZC3smkNeXPVELz7ikPbhUj0bQjB07EoE9qtLrem14ZUYWdVayYbsjVwIiL4WBIMV4aQ==",
+      "dev": true,
+      "requires": {
+        "@jest/fake-timers": "^24.9.0",
+        "@jest/transform": "^24.9.0",
+        "@jest/types": "^24.9.0",
+        "jest-mock": "^24.9.0"
+      }
+    },
+    "@jest/fake-timers": {
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/fake-timers/-/fake-timers-24.9.0.tgz",
+      "integrity": "sha512-eWQcNa2YSwzXWIMC5KufBh3oWRIijrQFROsIqt6v/NS9Io/gknw1jsAC9c+ih/RQX4A3O7SeWAhQeN0goKhT9A==",
+      "dev": true,
+      "requires": {
+        "@jest/types": "^24.9.0",
+        "jest-message-util": "^24.9.0",
+        "jest-mock": "^24.9.0"
+      }
+    },
+    "@jest/reporters": {
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@@ -5603,27 +8742,29 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "typescript": {
+      "version": "3.6.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.4.tgz",
+      "integrity": "sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg==",
+      "dev": true
+    },
     "uglify-js": {
-      "version": "3.4.10",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.4.10.tgz",
-      "integrity": "sha512-Y2VsbPVs0FIshJztycsO2SfPk7/KAF/T72qzv9u5EpQ4kB2hQoHlhNQTsNyy6ul7lQtqJN/AoWeS23OzEiEFxw==",
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.1.tgz",
+      "integrity": "sha512-+dSJLJpXBb6oMHP+Yvw8hUgElz4gLTh82XuX68QiJVTXaE5ibl6buzhNkQdYhBlIhozWOC9ge16wyRmjG4TwVQ==",
       "dev": true,
+      "optional": true,
       "requires": {
-        "commander": "~2.19.0",
+        "commander": "2.20.0",
         "source-map": "~0.6.1"
       },
       "dependencies": {
-        "commander": {
-          "version": "2.19.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.19.0.tgz",
-          "integrity": "sha512-6tvAOO+D6OENvRAh524Dh9jcfKTYDQAqvqezbCW82xj5X0pSrcpxtvRKHLG0yBY6SD7PSDrJaj+0AiOcKVd1Xg==",
-          "dev": true
-        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
           "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -5709,12 +8850,6 @@
       "integrity": "sha512-kXpym8nmDmlCBr7nKdIx8P2jNBa+pBpIUFRnKJ4dr8htyYGJFokkr2ZvERRtUN+9SY+JqXouNgUPtv6JQva/2Q==",
       "dev": true
     },
-    "upper-case": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/upper-case/-/upper-case-1.1.3.tgz",
-      "integrity": "sha1-9rRQHC7EzdJrp4vnIilh3ndiFZg=",
-      "dev": true
-    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -5797,12 +8932,6 @@
         "object.getownpropertydescriptors": "^2.0.3"
       }
     },
-    "utila": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/utila/-/utila-0.4.0.tgz",
-      "integrity": "sha1-ihagXURWV6Oupe7MWxKk+lN5dyw=",
-      "dev": true
-    },
     "utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -5821,18 +8950,68 @@
       "integrity": "sha512-CNmdbwQMBjwr9Gsmohvm0pbL954tJrNzf6gWL3K+QMQf00PF7ERGrEiLgjuU3mKreLC2MeGhUsNV9ybTbLgd3w==",
       "dev": true
     },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
       "dev": true
     },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
     "vm-browserify": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-1.1.0.tgz",
       "integrity": "sha512-iq+S7vZJE60yejDYM0ek6zg308+UZsdtPExWP9VZoCFCz1zkJoXFnAX7aZfd/ZwrkidzdUZL0C/ryW+JwAiIGw==",
       "dev": true
     },
+    "w3c-hr-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.1.tgz",
+      "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
+      "requires": {
+        "browser-process-hrtime": "^0.1.2"
+      }
+    },
+    "w3c-xmlserializer": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-1.1.2.tgz",
+      "integrity": "sha512-p10l/ayESzrBMYWRID6xbuCKh2Fp77+sA0doRuGn4tTIMrrZVeqfpKjXHY+oDh3K4nLdPgNwMTVP6Vp4pvqbNg==",
+      "dev": true,
+      "requires": {
+        "domexception": "^1.0.1",
+        "webidl-conversions": "^4.0.2",
+        "xml-name-validator": "^3.0.0"
+      }
+    },
+    "walker": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
+      "integrity": "sha1-L3+bj9ENZ3JisYqITijRlhjgKPs=",
+      "dev": true,
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
     "watchpack": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.6.0.tgz",
@@ -5853,6 +9032,12 @@
         "minimalistic-assert": "^1.0.0"
       }
     },
+    "webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true
+    },
     "webpack": {
       "version": "4.39.2",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.39.2.tgz",
@@ -6176,6 +9361,32 @@
       "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg==",
       "dev": true
     },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.24"
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==",
+      "dev": true
+    },
+    "whatwg-url": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.1.0.tgz",
+      "integrity": "sha512-WUu7Rg1DroM7oQvGWfOiAK21n74Gg+T4elXEQYkOhtyLeWiJFoOGLXPKI/9gzIie9CtwVLm8wtw6YJdKyxSjeg==",
+      "dev": true,
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -6191,6 +9402,48 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true
+        },
+        "string-width": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+          "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+          "dev": true,
+          "requires": {
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
+      }
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
     "worker-farm": {
       "version": "1.7.0",
       "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.7.0.tgz",
@@ -6217,6 +9470,26 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
+    "write-file-atomic": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
+      "integrity": "sha512-TGHFeZEZMnv+gBFRfjAcxL5bPHrsGKtnb4qsFAws7/vlh+QfwAaySIw4AXP9ZskTTh5GWu3FLuJhsWVdiJPGvg==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
     "ws": {
       "version": "6.2.1",
       "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
@@ -6226,6 +9499,18 @@
         "async-limiter": "~1.0.0"
       }
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
+    "xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
diff --git a/package.json b/package.json
index fbf709e3..3a26172a 100644
--- a/package.json
+++ b/package.json
@@ -1,9 +1,8 @@
 {
   "name": "qr-code-styling",
-  "version": "0.3.0",
+  "version": "1.0.0",
   "description": "Add a style and an image to your QR code",
   "main": "lib/qr-code-styling.js",
-  "module": "src/index.js",
   "files": [
     "lib"
   ],
@@ -11,19 +10,29 @@
     "qrcode-generator": "^1.4.3"
   },
   "devDependencies": {
-    "@babel/core": "^7.5.5",
-    "babel-loader": "^8.0.6",
+    "@typescript-eslint/eslint-plugin": "^2.4.0",
+    "@typescript-eslint/parser": "^2.4.0",
+    "canvas": "^2.6.0",
     "clean-webpack-plugin": "^3.0.0",
-    "file-loader": "^4.2.0",
-    "html-webpack-plugin": "^3.2.0",
+    "eslint": "^6.2.1",
+    "eslint-config-prettier": "^6.1.0",
+    "eslint-loader": "^2.2.1",
+    "eslint-plugin-jest": "^22.15.1",
+    "eslint-plugin-prettier": "^3.1.0",
+    "jest": "^24.9.0",
+    "jest-environment-jsdom-fifteen": "^1.0.0",
+    "prettier": "^1.18.2",
+    "ts-jest": "^24.0.2",
+    "ts-loader": "^6.2.0",
+    "typescript": "^3.6.4",
     "webpack": "^4.39.2",
     "webpack-cli": "^3.3.6",
     "webpack-dev-server": "^3.8.0"
   },
   "scripts": {
-    "build:lib": "webpack --mode=production --config configs/webpack.config.lib.js",
-    "build:app": "webpack --mode=production --config configs/webpack.config.app.js",
-    "start": "webpack-dev-server --mode=development --open --config configs/webpack.config.app.js"
+    "build": "webpack --mode=production",
+    "build:dev": "webpack --mode=development",
+    "test": "jest"
   },
   "repository": {
     "type": "git",
diff --git a/app/assets/facebook_example.png b/src/assets/facebook_example.png
similarity index 100%
rename from app/assets/facebook_example.png
rename to src/assets/facebook_example.png
diff --git a/app/assets/instagram_example.png b/src/assets/instagram_example.png
similarity index 100%
rename from app/assets/instagram_example.png
rename to src/assets/instagram_example.png
diff --git a/app/assets/telegram_example.png b/src/assets/telegram_example.png
similarity index 100%
rename from app/assets/telegram_example.png
rename to src/assets/telegram_example.png
diff --git a/src/assets/test/image_from_readme.png b/src/assets/test/image_from_readme.png
new file mode 100644
index 00000000..9286cf69
Binary files /dev/null and b/src/assets/test/image_from_readme.png differ
diff --git a/src/assets/test/rounded_dots.png b/src/assets/test/rounded_dots.png
new file mode 100644
index 00000000..d3623cda
Binary files /dev/null and b/src/assets/test/rounded_dots.png differ
diff --git a/src/assets/test/simple_dots.png b/src/assets/test/simple_dots.png
new file mode 100644
index 00000000..b517899f
Binary files /dev/null and b/src/assets/test/simple_dots.png differ
diff --git a/src/assets/test/simple_qr.png b/src/assets/test/simple_qr.png
new file mode 100644
index 00000000..cc330517
Binary files /dev/null and b/src/assets/test/simple_qr.png differ
diff --git a/src/assets/test/simple_qr_with_image.png b/src/assets/test/simple_qr_with_image.png
new file mode 100644
index 00000000..ea5ab792
Binary files /dev/null and b/src/assets/test/simple_qr_with_image.png differ
diff --git a/src/assets/test/simple_square_dot.png b/src/assets/test/simple_square_dot.png
new file mode 100644
index 00000000..1f3692e6
Binary files /dev/null and b/src/assets/test/simple_square_dot.png differ
diff --git a/src/common.d.ts b/src/common.d.ts
new file mode 100644
index 00000000..07f28f62
--- /dev/null
+++ b/src/common.d.ts
@@ -0,0 +1,11 @@
+interface UnknownObject {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  [key: string]: any;
+}
+
+type DotType = "dots" | "rounded" | "square";
+type Extension = "png" | "jpeg" | "webp";
+
+interface DotTypes {
+  [key: string]: DotType;
+}
diff --git a/src/constants/dotTypes.test.js b/src/constants/dotTypes.test.js
new file mode 100644
index 00000000..cb8d909a
--- /dev/null
+++ b/src/constants/dotTypes.test.js
@@ -0,0 +1,15 @@
+import dotTypes from "./dotTypes";
+
+describe("Dot Types", () => {
+  it("The export of the module should be an object", () => {
+    expect(typeof dotTypes).toBe("object");
+  });
+
+  it.each(Object.values(dotTypes))("Values should be strings", value => {
+    expect(typeof value).toBe("string");
+  });
+
+  it.each(Object.keys(dotTypes))("A key of the object should be the same as a value", key => {
+    expect(key).toBe(dotTypes[key]);
+  });
+});
diff --git a/src/constants/dotTypes.ts b/src/constants/dotTypes.ts
new file mode 100644
index 00000000..4f978861
--- /dev/null
+++ b/src/constants/dotTypes.ts
@@ -0,0 +1,5 @@
+export default {
+  dots: "dots",
+  rounded: "rounded",
+  square: "square"
+} as DotTypes;
diff --git a/src/constants/errorCorrectLevels.js b/src/constants/errorCorrectLevels.js
deleted file mode 100644
index c4e63b79..00000000
--- a/src/constants/errorCorrectLevels.js
+++ /dev/null
@@ -1,6 +0,0 @@
-export default {
-    L: "L",
-    M: "M",
-    Q: "Q",
-    H: "H"
-}
\ No newline at end of file
diff --git a/src/constants/errorCorrectionLevels.test.js b/src/constants/errorCorrectionLevels.test.js
new file mode 100644
index 00000000..c56dfc72
--- /dev/null
+++ b/src/constants/errorCorrectionLevels.test.js
@@ -0,0 +1,19 @@
+import errorCorrectionLevels from "./errorCorrectionLevels";
+
+describe("Error Correction Levels", () => {
+  it("The export of the module should be an object", () => {
+    expect(typeof errorCorrectionLevels).toBe("object");
+  });
+
+  it.each(Object.values(errorCorrectionLevels))("Values should be strings", value => {
+    expect(typeof value).toBe("string");
+  });
+
+  it.each(Object.keys(errorCorrectionLevels))("A key of the object should be the same as a value", key => {
+    expect(key).toBe(errorCorrectionLevels[key]);
+  });
+
+  it.each(Object.keys(errorCorrectionLevels))("Allowed only particular keys", key => {
+    expect(["L", "M", "Q", "H"]).toContain(key);
+  });
+});
diff --git a/src/constants/errorCorrectionLevels.ts b/src/constants/errorCorrectionLevels.ts
new file mode 100644
index 00000000..2c8944f5
--- /dev/null
+++ b/src/constants/errorCorrectionLevels.ts
@@ -0,0 +1,10 @@
+interface ErrorCorrectionLevels {
+  [key: string]: ErrorCorrectionLevel;
+}
+
+export default {
+  L: "L",
+  M: "M",
+  Q: "Q",
+  H: "H"
+} as ErrorCorrectionLevels;
diff --git a/src/constants/errorCorrectionPercents.js b/src/constants/errorCorrectionPercents.js
deleted file mode 100644
index 278a72dd..00000000
--- a/src/constants/errorCorrectionPercents.js
+++ /dev/null
@@ -1,6 +0,0 @@
-export default {
-    L: 0.07,
-    M: 0.15,
-    Q: 0.25,
-    H: 0.30,
-};
\ No newline at end of file
diff --git a/src/constants/errorCorrectionPercents.test.js b/src/constants/errorCorrectionPercents.test.js
new file mode 100644
index 00000000..bd7e9d58
--- /dev/null
+++ b/src/constants/errorCorrectionPercents.test.js
@@ -0,0 +1,15 @@
+import errorCorrectionPercents from "./errorCorrectionPercents";
+
+describe("Error Correction Percents", () => {
+  it("The export of the module should be an object", () => {
+    expect(typeof errorCorrectionPercents).toBe("object");
+  });
+
+  it.each(Object.values(errorCorrectionPercents))("Values should be numbers", value => {
+    expect(typeof value).toBe("number");
+  });
+
+  it.each(Object.keys(errorCorrectionPercents))("Allowed only particular keys", key => {
+    expect(["L", "M", "Q", "H"]).toContain(key);
+  });
+});
diff --git a/src/constants/errorCorrectionPercents.ts b/src/constants/errorCorrectionPercents.ts
new file mode 100644
index 00000000..41ca902a
--- /dev/null
+++ b/src/constants/errorCorrectionPercents.ts
@@ -0,0 +1,10 @@
+interface ErrorCorrectionPercents {
+  [key: string]: number;
+}
+
+export default {
+  L: 0.07,
+  M: 0.15,
+  Q: 0.25,
+  H: 0.3
+} as ErrorCorrectionPercents;
diff --git a/src/constants/modes.js b/src/constants/modes.js
deleted file mode 100644
index 8c3306b5..00000000
--- a/src/constants/modes.js
+++ /dev/null
@@ -1,6 +0,0 @@
-export default {
-    numeric: "Numeric",
-    alphanumeric: "Alphanumeric",
-    byte: "Byte",
-    kanji: "Kanji"
-}
\ No newline at end of file
diff --git a/src/constants/modes.test.js b/src/constants/modes.test.js
new file mode 100644
index 00000000..b9691993
--- /dev/null
+++ b/src/constants/modes.test.js
@@ -0,0 +1,11 @@
+import modes from "./modes";
+
+describe("Modes", () => {
+  it("The export of the module should be an object", () => {
+    expect(typeof modes).toBe("object");
+  });
+
+  it.each(Object.values(modes))("Values should be strings", value => {
+    expect(typeof value).toBe("string");
+  });
+});
diff --git a/src/constants/modes.ts b/src/constants/modes.ts
new file mode 100644
index 00000000..a08bb3d2
--- /dev/null
+++ b/src/constants/modes.ts
@@ -0,0 +1,10 @@
+interface Modes {
+  [key: string]: Mode;
+}
+
+export default {
+  numeric: "Numeric",
+  alphanumeric: "Alphanumeric",
+  byte: "Byte",
+  kanji: "Kanji"
+} as Modes;
diff --git a/src/constants/qrTypes.test.js b/src/constants/qrTypes.test.js
new file mode 100644
index 00000000..f9ff8a1f
--- /dev/null
+++ b/src/constants/qrTypes.test.js
@@ -0,0 +1,19 @@
+import qrTypes from "./qrTypes";
+
+describe("QR Types", () => {
+  it("The export of the module should be an object", () => {
+    expect(typeof qrTypes).toBe("object");
+  });
+
+  it.each(Object.values(qrTypes))("Values should be number", value => {
+    expect(typeof value).toBe("number");
+  });
+
+  it.each(Object.keys(qrTypes))("A key of the object should be the same as a value", key => {
+    expect(key).toBe(qrTypes[key].toString());
+  });
+
+  it("The object should contain 41 keys", () => {
+    expect(Object.keys(qrTypes).length).toBe(41);
+  });
+});
diff --git a/src/constants/qrTypes.ts b/src/constants/qrTypes.ts
new file mode 100644
index 00000000..af2bff05
--- /dev/null
+++ b/src/constants/qrTypes.ts
@@ -0,0 +1,20 @@
+interface TypesMap {
+  [key: number]: TypeNumber;
+}
+
+const qrTypes: TypesMap = {};
+
+for (let type = 0; type <= 40; type++) {
+  qrTypes[type] = type as TypeNumber;
+}
+
+// 0 types is autodetect
+
+// types = {
+//     0: 0,
+//     1: 1,
+//     ...
+//     40: 40
+// }
+
+export default qrTypes;
diff --git a/src/constants/types.js b/src/constants/types.js
deleted file mode 100644
index 89526996..00000000
--- a/src/constants/types.js
+++ /dev/null
@@ -1,17 +0,0 @@
-const types = {};
-
-for(let type = 0; type <= 40; type++) {
-    types[type] = type;
-}
-
-// 0 types is autodetect
-
-// types = {
-//     0: 0,
-//     1: 1,
-//     2: 2,
-//     ...
-//     40: 40
-// }
-
-export default types;
\ No newline at end of file
diff --git a/src/core/QRCanvas.js b/src/core/QRCanvas.js
deleted file mode 100644
index 3147672d..00000000
--- a/src/core/QRCanvas.js
+++ /dev/null
@@ -1,137 +0,0 @@
-import calculateImageSize from "../tools/calculateImageSize";
-import errorCorrectionPercents from "../constants/errorCorrectionPercents";
-import QRDot from "./QRDot";
-
-export default class QRCanvas {
-    constructor(options) {
-        this.canvas = document.createElement("canvas");
-        this.canvas.width = options.width;
-        this.canvas.height = options.height;
-        this.options = options;
-    }
-
-    get context () {
-        return this.canvas.getContext("2d");
-    }
-
-    get width () {
-        return this.canvas.width;
-    }
-
-    get height () {
-        return this.canvas.height;
-    }
-
-    getCanvas () {
-        return this.canvas;
-    }
-
-    clear () {
-        const canvasContext = this.context;
-
-        canvasContext.clearRect(0, 0, this.canvas.width, this.canvas.height);
-    }
-
-    drawQR(qr) {
-        this.clear();
-        this.drawBackground();
-        this.qr = qr;
-
-        if (this.options.image) {
-            this.drawImageAndDots();
-        } else {
-            this.drawDots();
-        }
-    }
-
-    drawBackground() {
-        const canvasContext = this.context;
-        const options = this.options;
-
-        canvasContext.fillStyle = options.backgroundOptions.color;
-        canvasContext.fillRect(0, 0, this.canvas.width, this.canvas.height);
-    }
-
-
-    drawDots(filter) {
-        const canvasContext = this.context;
-        const options = this.options;
-        const count = this.qr.getModuleCount();
-        const minSize = Math.min(options.width, options.height);
-        const dotSize = Math.floor(minSize / count);
-        const xBeginning = Math.floor((options.width - count * dotSize) / 2);
-        const yBeginning = Math.floor((options.height - count * dotSize) / 2);
-
-        if (count > options.width || count > options.height) {
-            throw "The canvas is too small.";
-        }
-
-        const dot = new QRDot({ context: canvasContext, type: options.dotsOptions.type });
-
-        for(let i = 0; i < count;  i++) {
-            for(let j = 0; j < count;  j++) {
-                if (filter && !filter(i, j)) {
-                    continue;
-                }
-
-                if (this.qr.isDark(i, j)) {
-                    canvasContext.fillStyle = options.dotsOptions.color;
-                    dot.draw(xBeginning + i * dotSize, yBeginning + j * dotSize, dotSize, (xOffset, yOffset) => {
-                        if (i + xOffset >= 0 && j + yOffset >= 0 && i + xOffset < count && j + yOffset < count) {
-                            if (filter && !filter(i + xOffset, j + yOffset)) return false;
-                            return this.qr.isDark(i + xOffset, j + yOffset);
-                        }
-                    });
-                }
-            }
-        }
-    }
-
-    drawImageAndDots() {
-        const canvasContext = this.context;
-        const options = this.options;
-        const count = this.qr.getModuleCount();
-        const minSize = Math.min(options.width, options.height);
-        const dotSize = Math.floor(minSize / count);
-        const xBeginning = Math.floor((options.width - count * dotSize) / 2);
-        const yBeginning = Math.floor((options.height - count * dotSize) / 2);
-
-        const image = new Image();
-        const coverLevel = options.imageOptions.imageSize * errorCorrectionPercents[options.qrOptions.errorCorrectionLevel];
-
-        image.src = options.image;
-        image.onload = () => {
-            const maxHiddenDots = Math.floor(coverLevel * count * count);
-            const {
-                resizedImageWidth,
-                resizedImageHeight,
-                hiddenDotsWidth,
-                hiddenDotsHeight
-            } = calculateImageSize({
-                originalWidth: image.width,
-                originalHeight: image.height,
-                maxHiddenDots,
-                dotSize
-            });
-
-            this.drawDots((i, j) => {
-                if (!options.imageOptions.hideBackgroundDots) {
-                    return true;
-                }
-                return (
-                    i < (count - hiddenDotsWidth) / 2
-                    || i >= (count + hiddenDotsWidth) / 2
-                    || j < (count - hiddenDotsHeight) / 2
-                    || j >= (count + hiddenDotsHeight) / 2
-                )
-            });
-
-            canvasContext.drawImage(
-                image,
-                xBeginning + (count * dotSize - resizedImageWidth) / 2,
-                yBeginning + (count * dotSize - resizedImageHeight) / 2,
-                resizedImageWidth,
-                resizedImageHeight);
-        };
-    }
-};
\ No newline at end of file
diff --git a/src/core/QRCanvas.test.js b/src/core/QRCanvas.test.js
new file mode 100644
index 00000000..b4a37723
--- /dev/null
+++ b/src/core/QRCanvas.test.js
@@ -0,0 +1,84 @@
+import fs from "fs";
+import path from "path";
+import qrcode from "qrcode-generator";
+import QRCanvas from "./QRCanvas";
+import qrTypes from "../constants/qrTypes";
+import errorCorrectionLevels from "../constants/errorCorrectionLevels";
+import modes from "../constants/modes";
+
+describe("Test QRCanvas class", () => {
+  let qr;
+  const defaultOptions = {
+    width: 100,
+    height: 100,
+    qrOptions: {
+      typeNumber: qrTypes[0],
+      errorCorrectionLevel: errorCorrectionLevels.Q
+    },
+    imageOptions: {
+      hideBackgroundDots: true,
+      imageSize: 0.4
+    },
+    dotsOptions: {
+      type: "square",
+      color: "#000"
+    },
+    backgroundOptions: {
+      color: "#fff"
+    }
+  };
+
+  beforeAll(() => {
+    qr = qrcode(defaultOptions.qrOptions.typeNumber, defaultOptions.qrOptions.errorCorrectionLevel);
+    qr.addData("TEST", modes.alphanumeric);
+    qr.make();
+  });
+
+  it("Should draw simple qr code", () => {
+    const expectedQRCodeFile = fs.readFileSync(path.resolve(__dirname, "../assets/test/simple_qr.png"), "base64");
+    const canvas = new QRCanvas(defaultOptions);
+
+    canvas.drawQR(qr);
+    expect(canvas.getCanvas().toDataURL()).toEqual(expect.stringContaining(expectedQRCodeFile));
+  });
+  it("Should draw a qr code with image", done => {
+    const expectedQRCodeFile = fs.readFileSync(
+      path.resolve(__dirname, "../assets/test/simple_qr_with_image.png"),
+      "base64"
+    );
+    const canvas = new QRCanvas({
+      ...defaultOptions,
+      image:
+        "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAQAAAAnOwc2AAAAEUlEQVR42mNk+M+AARiHsiAAcCIKAYwFoQ8AAAAASUVORK5CYII="
+    });
+    canvas.drawQR(qr);
+    //TODO remove setTimout
+    setTimeout(() => {
+      canvas._image.onload();
+      expect(canvas.getCanvas().toDataURL()).toEqual(expect.stringContaining(expectedQRCodeFile));
+      done();
+    });
+  });
+  it("Should draw a qr code with image without dots hiding", done => {
+    const expectedQRCodeFile = fs.readFileSync(
+      path.resolve(__dirname, "../assets/test/simple_qr_with_image.png"),
+      "base64"
+    );
+    const canvas = new QRCanvas({
+      ...defaultOptions,
+      image:
+        "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAQAAAAnOwc2AAAAEUlEQVR42mNk+M+AARiHsiAAcCIKAYwFoQ8AAAAASUVORK5CYII=",
+      imageOptions: {
+        ...defaultOptions.imageOptions,
+        hideBackgroundDots: false
+      }
+    });
+    canvas.drawQR(qr);
+    //TODO remove setTimout
+    setTimeout(() => {
+      canvas._image.onload();
+      expect(canvas.getCanvas().toDataURL()).toEqual(expect.stringContaining(expectedQRCodeFile));
+      done();
+    });
+  });
+});
diff --git a/src/core/QRCanvas.ts b/src/core/QRCanvas.ts
new file mode 100644
index 00000000..e5aacb51
--- /dev/null
+++ b/src/core/QRCanvas.ts
@@ -0,0 +1,178 @@
+import calculateImageSize from "../tools/calculateImageSize";
+import errorCorrectionPercents from "../constants/errorCorrectionPercents";
+import QRDot from "./QRDot";
+import { Options } from "./QROptions";
+
+type FilterFunction = (i: number, j: number) => boolean;
+
+export default class QRCanvas {
+  _canvas: HTMLCanvasElement;
+  _options: Options;
+  _qr?: QRCode;
+  _image?: HTMLImageElement;
+
+  //TODO don't pass all options to this class
+  constructor(options: Options) {
+    this._canvas = document.createElement("canvas");
+    this._canvas.width = options.width;
+    this._canvas.height = options.height;
+    this._options = options;
+  }
+
+  get context(): CanvasRenderingContext2D | null {
+    return this._canvas.getContext("2d");
+  }
+
+  get width(): number {
+    return this._canvas.width;
+  }
+
+  get height(): number {
+    return this._canvas.height;
+  }
+
+  getCanvas(): HTMLCanvasElement {
+    return this._canvas;
+  }
+
+  clear(): void {
+    const canvasContext = this.context;
+
+    if (canvasContext) {
+      canvasContext.clearRect(0, 0, this._canvas.width, this._canvas.height);
+    }
+  }
+
+  drawQR(qr: QRCode): Promise<void> {
+    this.clear();
+    this.drawBackground();
+    this._qr = qr;
+
+    if (this._options.image) {
+      return this.drawImageAndDots();
+    } else {
+      this.drawDots();
+      return Promise.resolve();
+    }
+  }
+
+  drawBackground(): void {
+    const canvasContext = this.context;
+    const options = this._options;
+
+    if (canvasContext) {
+      canvasContext.fillStyle = options.backgroundOptions.color;
+      canvasContext.fillRect(0, 0, this._canvas.width, this._canvas.height);
+    }
+  }
+
+  drawDots(filter?: FilterFunction): void {
+    if (!this._qr) {
+      throw "QR code is not defined";
+    }
+
+    const canvasContext = this.context;
+
+    if (!canvasContext) {
+      throw "QR code is not defined";
+    }
+
+    const options = this._options;
+    const count = this._qr.getModuleCount();
+
+    if (count > options.width || count > options.height) {
+      throw "The canvas is too small.";
+    }
+
+    const minSize = Math.min(options.width, options.height);
+    const dotSize = Math.floor(minSize / count);
+    const xBeginning = Math.floor((options.width - count * dotSize) / 2);
+    const yBeginning = Math.floor((options.height - count * dotSize) / 2);
+    const dot = new QRDot({ context: canvasContext, type: options.dotsOptions.type });
+
+    for (let i = 0; i < count; i++) {
+      for (let j = 0; j < count; j++) {
+        if (filter && !filter(i, j)) {
+          continue;
+        }
+        if (!this._qr.isDark(i, j)) {
+          continue;
+        }
+        canvasContext.fillStyle = options.dotsOptions.color;
+        dot.draw(
+          xBeginning + i * dotSize,
+          yBeginning + j * dotSize,
+          dotSize,
+          (xOffset: number, yOffset: number): boolean => {
+            if (i + xOffset < 0 || j + yOffset < 0 || i + xOffset >= count || j + yOffset >= count) return false;
+            if (filter && !filter(i + xOffset, j + yOffset)) return false;
+            return !!this._qr && this._qr.isDark(i + xOffset, j + yOffset);
+          }
+        );
+      }
+    }
+  }
+
+  drawImageAndDots(): Promise<void> {
+    return new Promise((resolve, reject) => {
+      if (!this._qr) {
+        return reject("QR code is not defined");
+      }
+
+      const canvasContext = this.context;
+
+      if (!canvasContext) {
+        return reject("QR code is not defined");
+      }
+
+      const options = this._options;
+      const count = this._qr.getModuleCount();
+      const minSize = Math.min(options.width, options.height);
+      const dotSize = Math.floor(minSize / count);
+      const xBeginning = Math.floor((options.width - count * dotSize) / 2);
+      const yBeginning = Math.floor((options.height - count * dotSize) / 2);
+      const image = new Image();
+      const coverLevel =
+        options.imageOptions.imageSize * errorCorrectionPercents[options.qrOptions.errorCorrectionLevel];
+
+      if (!options.image) {
+        return reject("Image is not defined");
+      }
+
+      this._image = image;
+      //TODO remove it from this place
+      image.onload = (): void => {
+        const maxHiddenDots = Math.floor(coverLevel * count * count);
+        const { width, height, hideXDots, hideYDots } = calculateImageSize({
+          originalWidth: image.width,
+          originalHeight: image.height,
+          maxHiddenDots,
+          maxHiddenAxisDots: count - 14,
+          dotSize
+        });
+
+        this.drawDots((i: number, j: number): boolean => {
+          if (!options.imageOptions.hideBackgroundDots) {
+            return true;
+          }
+          return (
+            i < (count - hideXDots) / 2 ||
+            i >= (count + hideXDots) / 2 ||
+            j < (count - hideYDots) / 2 ||
+            j >= (count + hideYDots) / 2
+          );
+        });
+
+        canvasContext.drawImage(
+          image,
+          xBeginning + (count * dotSize - width) / 2,
+          yBeginning + (count * dotSize - height) / 2,
+          width,
+          height
+        );
+        resolve();
+      };
+      image.src = options.image;
+    });
+  }
+}
diff --git a/src/core/QRCode.js b/src/core/QRCode.js
deleted file mode 100644
index 0b1985fa..00000000
--- a/src/core/QRCode.js
+++ /dev/null
@@ -1,7 +0,0 @@
-import qrcode from "qrcode-generator";
-
-export default class QRCode extends qrcode {
-    constructor(options) {
-        super(options.qrOptions.typeNumber, options.qrOptions.errorCorrectionLevel);
-    }
-};
\ No newline at end of file
diff --git a/src/core/QRCodeStyling.js b/src/core/QRCodeStyling.js
deleted file mode 100644
index bc9db7c3..00000000
--- a/src/core/QRCodeStyling.js
+++ /dev/null
@@ -1,72 +0,0 @@
-import getMode from "../tools/getMode";
-import mergeDeep from "../tools/merge";
-import errorCorrectLevels from "../constants/errorCorrectLevels";
-import types from "../constants/types";
-import QRCode from "./QRCode";
-import QRCanvas from "./QRCanvas";
-
-const defaultOptions = {
-    width: 300,
-    height: 300,
-    data: undefined,
-    image: undefined,
-    qrOptions: {
-        typeNumber: types[0],
-        mode: undefined,
-        errorCorrectionLevel: errorCorrectLevels.Q,
-    },
-    imageOptions: {
-        hideBackgroundDots: true,
-        imageSize: 0.4
-    },
-    dotsOptions: {
-        type: "square",
-        color: "#000",
-    },
-    backgroundOptions: {
-        color: "#fff",
-    }
-};
-
-export default class QRCodeStyling {
-    constructor(options) {
-        this.options = mergeDeep(defaultOptions, options);
-        this.update();
-    }
-
-    update(options) {
-        this.clearContainer(this.container);
-        this.options = mergeDeep(this.options, options);
-
-        if (!this.options.data) {
-            return;
-        }
-
-        this.qr = new QRCode(this.options);
-        this.qr.addData(this.options.data, this.options.qrOptions.mode || getMode(this.options.data));
-        this.qr.make();
-        this.canvas = new QRCanvas(this.options);
-        this.canvas.drawQR(this.qr);
-        this.append(this.container);
-    }
-
-    clearContainer(container) {
-        if (container) {
-            container.innerHTML = "";
-        }
-    }
-
-    append(container) {
-        if (!container) {
-            return;
-        }
-
-        if (typeof container.appendChild !== "function") {
-            throw "Container should be a single DOM node";
-        }
-
-        this.container = container;
-
-        container.appendChild(this.canvas.getCanvas());
-    }
-};
\ No newline at end of file
diff --git a/src/core/QRCodeStyling.test.js b/src/core/QRCodeStyling.test.js
new file mode 100644
index 00000000..d71876a1
--- /dev/null
+++ b/src/core/QRCodeStyling.test.js
@@ -0,0 +1,40 @@
+import QRCodeStyling from "./QRCodeStyling";
+import fs from "fs";
+import path from "path";
+
+describe("Test QRCodeStyling class", () => {
+  beforeAll(() => {
+    global.document.body.innerHTML = "<div id='container'></div>";
+  });
+
+  it("The README example should work correctly", done => {
+    const expectedQRCodeFile = fs.readFileSync(
+      path.resolve(__dirname, "../assets/test/image_from_readme.png"),
+      "base64"
+    );
+    const qrCode = new QRCodeStyling({
+      width: 300,
+      height: 300,
+      data: "TEST",
+      image:
+        "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAQAAAAnOwc2AAAAEUlEQVR42mNk+M+AARiHsiAAcCIKAYwFoQ8AAAAASUVORK5CYII=",
+      dotsOptions: {
+        color: "#4267b2",
+        type: "rounded"
+      },
+      backgroundOptions: {
+        color: "#e9ebee"
+      }
+    });
+    global.document.body.innerHTML = "<div id='container'></div>";
+
+    const container = global.document.getElementById("container");
+
+    qrCode.append(container);
+    //TODO remove setTimout
+    setTimeout(() => {
+      expect(qrCode._canvas.getCanvas().toDataURL()).toEqual(expect.stringContaining(expectedQRCodeFile));
+      done();
+    });
+  });
+});
diff --git a/src/core/QRCodeStyling.ts b/src/core/QRCodeStyling.ts
new file mode 100644
index 00000000..f1fcb32b
--- /dev/null
+++ b/src/core/QRCodeStyling.ts
@@ -0,0 +1,62 @@
+import getMode from "../tools/getMode";
+import mergeDeep from "../tools/merge";
+import downloadURI from "../tools/downloadURI";
+import QRCanvas from "./QRCanvas";
+import defaultOptions, { Options } from "./QROptions";
+import qrcode from "qrcode-generator";
+
+export default class QRCodeStyling {
+  _options: Options;
+  _container?: HTMLElement;
+  _canvas?: QRCanvas;
+  _qr?: QRCode;
+
+  constructor(options?: Partial<Options>) {
+    this._options = options ? (mergeDeep(defaultOptions, options) as Options) : defaultOptions;
+    this.update();
+  }
+
+  static _clearContainer(container?: HTMLElement): void {
+    if (container) {
+      container.innerHTML = "";
+    }
+  }
+
+  update(options?: Partial<Options>): void {
+    QRCodeStyling._clearContainer(this._container);
+    this._options = options ? (mergeDeep(this._options, options) as Options) : this._options;
+
+    if (!this._options.data) {
+      return;
+    }
+
+    this._qr = qrcode(this._options.qrOptions.typeNumber, this._options.qrOptions.errorCorrectionLevel);
+    this._qr.addData(this._options.data, this._options.qrOptions.mode || getMode(this._options.data));
+    this._qr.make();
+    this._canvas = new QRCanvas(this._options);
+    this._canvas.drawQR(this._qr);
+    this.append(this._container);
+  }
+
+  append(container?: HTMLElement): void {
+    if (!container) {
+      return;
+    }
+
+    if (typeof container.appendChild !== "function") {
+      throw "Container should be a single DOM node";
+    }
+
+    if (this._canvas) {
+      container.appendChild(this._canvas.getCanvas());
+    }
+
+    this._container = container;
+  }
+
+  download(extension?: Extension): void {
+    if (!this._canvas) return;
+    const data = this._canvas.getCanvas().toDataURL(extension ? `image/${extension}` : undefined);
+    downloadURI(data, `qr.${extension || "png"}`);
+  }
+}
diff --git a/src/core/QRDot.js b/src/core/QRDot.js
deleted file mode 100644
index 40cbb8f1..00000000
--- a/src/core/QRDot.js
+++ /dev/null
@@ -1,52 +0,0 @@
-export default class QRDot {
-    constructor({ context, type }) {
-        this.context = context;
-        this.type = type;
-    }
-
-    draw(x, y, size, getNeighbor) {
-        const context = this.context;
-        const type = this.type;
-
-        if (type === "dots") {
-            context.beginPath();
-            context.arc(x + size / 2, y + size / 2,size / 2,0,Math.PI*2);
-            context.fill();
-        } else if (type === "rounded") {
-            context.beginPath();
-            context.moveTo(x, y + size / 2);
-
-            if (getNeighbor(-1, 0) || getNeighbor(0, -1)) {
-                context.lineTo(x, y);
-                context.lineTo(x + size / 2, y);
-            } else {
-                context.arc(x + size / 2, y + size / 2,size / 2, - Math.PI,- Math.PI / 2);
-            }
-
-            if (getNeighbor(0, -1) || getNeighbor(1, 0)) {
-                context.lineTo(x + size, y);
-                context.lineTo(x + size, y + size / 2);
-            } else {
-                context.arc(x + size / 2, y + size / 2,size / 2,- Math.PI / 2, 0);
-            }
-
-            if (getNeighbor(1, 0) || getNeighbor(0, 1)) {
-                context.lineTo(x + size, y + size);
-                context.lineTo(x + size / 2, y + size);
-            } else {
-                context.arc(x + size / 2, y + size / 2,size / 2, 0, Math.PI / 2);
-            }
-
-            if (getNeighbor(0, 1) || getNeighbor(-1, 0)) {
-                context.lineTo(x, y + size);
-                context.lineTo(x, y + size / 2);
-            } else {
-                context.arc(x + size / 2, y + size / 2,size / 2, Math.PI / 2, Math.PI);
-            }
-
-            context.fill();
-        } else {
-            context.fillRect(x, y, size, size);
-        }
-    }
-};
\ No newline at end of file
diff --git a/src/core/QRDot.test.js b/src/core/QRDot.test.js
new file mode 100644
index 00000000..d0701213
--- /dev/null
+++ b/src/core/QRDot.test.js
@@ -0,0 +1,73 @@
+import QRDot from "./QRDot";
+import fs from "fs";
+import path from "path";
+
+describe("Test QRDot class", () => {
+  const canvasSize = 100;
+  let canvas, canvasContext;
+
+  beforeAll(() => {
+    canvas = global.document.createElement("canvas");
+    canvas.width = canvasSize;
+    canvas.height = canvasSize;
+    canvasContext = canvas.getContext("2d");
+  });
+
+  beforeEach(() => {
+    canvasContext.fillStyle = "#fff";
+    canvasContext.fillRect(0, 0, canvasSize, canvasSize);
+    canvasContext.fillStyle = "#000";
+  });
+
+  afterEach(() => {
+    canvasContext.clearRect(0, 0, canvas.width, canvas.height);
+  });
+
+  it("Should draw simple square dot", () => {
+    const dotSize = 50;
+    const imgFile = fs.readFileSync(path.resolve(__dirname, "../assets/test/simple_square_dot.png"), "base64");
+    const dot = new QRDot({ context: canvasContext, type: "square" });
+    dot.draw(dotSize / 2, dotSize / 2, dotSize, () => false);
+
+    expect(canvas.toDataURL()).toEqual(expect.stringContaining(imgFile));
+  });
+
+  it("Should draw simple dots", () => {
+    const dotSize = 40;
+    const imgFile = fs.readFileSync(path.resolve(__dirname, "../assets/test/simple_dots.png"), "base64");
+    const dot = new QRDot({ context: canvasContext, type: "dots" });
+    dot.draw(10, 30, dotSize, () => false);
+    dot.draw(50, 30, dotSize, () => false);
+
+    expect(canvas.toDataURL()).toEqual(expect.stringContaining(imgFile));
+  });
+  it("Should draw rounded dots", () => {
+    const dotSize = 10;
+    const matrix = [
+      [1, 0, 1, 1, 0],
+      [0, 0, 0, 0, 0],
+      [1, 1, 0, 1, 1],
+      [0, 1, 0, 1, 1],
+      [0, 0, 1, 0, 0],
+    ];
+    const imgFile = fs.readFileSync(path.resolve(__dirname, "../assets/test/rounded_dots.png"), "base64");
+    const dot = new QRDot({ context: canvasContext, type: "rounded" });
+
+    for (let y = 0; y < matrix.length; y++) {
+      for (let x = 0; x < matrix[y].length; x++) {
+        if (!matrix[y][x]) {
+          continue;
+        }
+        dot.draw(25 + x * dotSize, 25 + y * dotSize, dotSize, (xOffset, yOffset) => {
+          if (matrix[y + yOffset]) {
+            return !!matrix[y + yOffset][x + xOffset];
+          } else {
+            return false;
+          }
+        });
+      }
+    }
+
+    expect(canvas.toDataURL()).toEqual(expect.stringContaining(imgFile));
+  });
+});
diff --git a/src/core/QRDot.ts b/src/core/QRDot.ts
new file mode 100644
index 00000000..cc520fca
--- /dev/null
+++ b/src/core/QRDot.ts
@@ -0,0 +1,83 @@
+type GetNeighbor = (x: number, y: number) => boolean;
+type DrawFunctionArgs = {
+  x: number;
+  y: number;
+  size: number;
+  context: CanvasRenderingContext2D;
+  getNeighbor: GetNeighbor;
+};
+
+export default class QRDot {
+  _context: CanvasRenderingContext2D;
+  _type: DotType;
+
+  constructor({ context, type }: { context: CanvasRenderingContext2D; type: DotType }) {
+    this._context = context;
+    this._type = type;
+  }
+
+  draw(x: number, y: number, size: number, getNeighbor: GetNeighbor): void {
+    const context = this._context;
+    const type = this._type;
+    let drawFunction;
+
+    switch (type) {
+      case "dots":
+        drawFunction = this._drawDots;
+        break;
+      case "rounded":
+        drawFunction = this._drawRounded;
+        break;
+      case "square":
+      default:
+        drawFunction = this._drawSquare;
+    }
+
+    drawFunction({ x, y, size, context, getNeighbor });
+  }
+
+  _drawDots({ x, y, size, context }: DrawFunctionArgs): void {
+    context.beginPath();
+    context.arc(x + size / 2, y + size / 2, size / 2, 0, Math.PI * 2);
+    context.fill();
+  }
+
+  _drawSquare({ x, y, size, context }: DrawFunctionArgs): void {
+    context.fillRect(x, y, size, size);
+  }
+
+  _drawRounded({ x, y, size, context, getNeighbor }: DrawFunctionArgs): void {
+    context.beginPath();
+    context.moveTo(x, y + size / 2);
+
+    if (getNeighbor(-1, 0) || getNeighbor(0, -1)) {
+      context.lineTo(x, y);
+      context.lineTo(x + size / 2, y);
+    } else {
+      context.arc(x + size / 2, y + size / 2, size / 2, -Math.PI, -Math.PI / 2);
+    }
+
+    if (getNeighbor(0, -1) || getNeighbor(1, 0)) {
+      context.lineTo(x + size, y);
+      context.lineTo(x + size, y + size / 2);
+    } else {
+      context.arc(x + size / 2, y + size / 2, size / 2, -Math.PI / 2, 0);
+    }
+
+    if (getNeighbor(1, 0) || getNeighbor(0, 1)) {
+      context.lineTo(x + size, y + size);
+      context.lineTo(x + size / 2, y + size);
+    } else {
+      context.arc(x + size / 2, y + size / 2, size / 2, 0, Math.PI / 2);
+    }
+
+    if (getNeighbor(0, 1) || getNeighbor(-1, 0)) {
+      context.lineTo(x, y + size);
+      context.lineTo(x, y + size / 2);
+    } else {
+      context.arc(x + size / 2, y + size / 2, size / 2, Math.PI / 2, Math.PI);
+    }
+
+    context.fill();
+  }
+}
diff --git a/src/core/QROptions.test.js b/src/core/QROptions.test.js
new file mode 100644
index 00000000..1ba66805
--- /dev/null
+++ b/src/core/QROptions.test.js
@@ -0,0 +1,23 @@
+import QROptions from "./QROptions";
+
+describe("Test default QROptions", () => {
+  it("The export of the module should be an object", () => {
+    expect(typeof QROptions).toBe("object");
+  });
+
+  describe("Test the content of options", () => {
+    const optionsKeys = [
+      "width",
+      "height",
+      "data",
+      "image",
+      "qrOptions",
+      "imageOptions",
+      "dotsOptions",
+      "backgroundOptions"
+    ];
+    it.each(optionsKeys)("The options should contain particular keys", key => {
+      expect(Object.keys(QROptions)).toContain(key);
+    });
+  });
+});
diff --git a/src/core/QROptions.ts b/src/core/QROptions.ts
new file mode 100644
index 00000000..8caae3a7
--- /dev/null
+++ b/src/core/QROptions.ts
@@ -0,0 +1,50 @@
+import qrTypes from "../constants/qrTypes";
+import errorCorrectionLevels from "../constants/errorCorrectionLevels";
+
+export type Options = {
+  width: number;
+  height: number;
+  data?: string;
+  image?: string;
+  qrOptions: {
+    typeNumber: TypeNumber;
+    mode?: Mode;
+    errorCorrectionLevel: ErrorCorrectionLevel;
+  };
+  imageOptions: {
+    hideBackgroundDots: boolean;
+    imageSize: number;
+  };
+  dotsOptions: {
+    type: DotType;
+    color: string;
+  };
+  backgroundOptions: {
+    color: string;
+  };
+};
+
+const defaultOptions: Options = {
+  width: 300,
+  height: 300,
+  data: undefined,
+  image: undefined,
+  qrOptions: {
+    typeNumber: qrTypes[0],
+    mode: undefined,
+    errorCorrectionLevel: errorCorrectionLevels.Q
+  },
+  imageOptions: {
+    hideBackgroundDots: true,
+    imageSize: 0.4
+  },
+  dotsOptions: {
+    type: "square",
+    color: "#000"
+  },
+  backgroundOptions: {
+    color: "#fff"
+  }
+};
+
+export default defaultOptions;
diff --git a/src/index.js b/src/index.js
deleted file mode 100644
index ea6f2182..00000000
--- a/src/index.js
+++ /dev/null
@@ -1,9 +0,0 @@
-import QRCodeStyling from "./core/QRCodeStyling";
-import errorCorrectLevels from "./constants/errorCorrectLevels";
-import types from "./constants/types";
-
-export default QRCodeStyling;
-export {
-    errorCorrectLevels,
-    types
-}
\ No newline at end of file
diff --git a/src/index.test.js b/src/index.test.js
new file mode 100644
index 00000000..8b4c0b43
--- /dev/null
+++ b/src/index.test.js
@@ -0,0 +1,9 @@
+import * as index from "./index";
+
+describe("Index", () => {
+  it.each(["dotTypes", "errorCorrectionLevels", "errorCorrectionPercents", "modes", "qrTypes", "default"])(
+    "The module should export certain submodules",
+    moduleName => {
+      expect(Object.keys(index)).toContain(moduleName);
+  });
+});
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 00000000..74237e34
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,9 @@
+import QRCodeStyling from "./core/QRCodeStyling";
+import dotTypes from "./constants/dotTypes";
+import errorCorrectionLevels from "./constants/errorCorrectionLevels";
+import errorCorrectionPercents from "./constants/errorCorrectionPercents";
+import modes from "./constants/modes";
+import qrTypes from "./constants/qrTypes";
+
+export default QRCodeStyling;
+export { dotTypes, errorCorrectionLevels, errorCorrectionPercents, modes, qrTypes };
diff --git a/src/tools/calculateImageSize.js b/src/tools/calculateImageSize.js
deleted file mode 100644
index 6681fb5d..00000000
--- a/src/tools/calculateImageSize.js
+++ /dev/null
@@ -1,44 +0,0 @@
-export function calculateImageSizeForXAxis   ({ originalImageXSize, originalImageYSize, maxHiddenDots, dotSize }) {
-    let dotsXCount, dotsYCount, imageXSize, imageYSize;
-    const k = originalImageYSize / originalImageXSize;
-
-    dotsXCount = Math.floor(Math.sqrt(maxHiddenDots / k));
-    if (dotsXCount % 2 === 0) dotsXCount--;
-    imageXSize = dotsXCount * dotSize;
-    dotsYCount = 1 + 2 * Math.ceil((dotsXCount * k * dotSize - dotSize) / (2 * dotSize));
-    imageYSize = Math.ceil(imageXSize * k);
-
-    return { dotsXCount, dotsYCount, imageXSize, imageYSize };
-}
-
-export default function calculateImageSize ({ originalWidth, originalHeight, maxHiddenDots, dotSize }) {
-    const maxHorizontalImage = calculateImageSizeForXAxis({
-        originalImageXSize: originalWidth,
-        originalImageYSize: originalHeight,
-        maxHiddenDots,
-        dotSize
-    });
-
-    const maxVerticalImage = calculateImageSizeForXAxis({
-        originalImageXSize: originalHeight,
-        originalImageYSize: originalWidth,
-        maxHiddenDots,
-        dotSize
-    });
-
-    if (maxHorizontalImage.imageXSize >= maxVerticalImage.imageYSize) {
-        return {
-            resizedImageWidth: maxHorizontalImage.imageXSize,
-            resizedImageHeight: maxHorizontalImage.imageYSize,
-            hiddenDotsWidth: maxHorizontalImage.dotsXCount,
-            hiddenDotsHeight: maxHorizontalImage.dotsYCount
-        };
-    } else {
-        return {
-            resizedImageWidth: maxVerticalImage.imageYSize,
-            resizedImageHeight: maxVerticalImage.imageXSize,
-            hiddenDotsWidth: maxVerticalImage.dotsYCount,
-            hiddenDotsHeight: maxVerticalImage.dotsXCount
-        };
-    }
-}
\ No newline at end of file
diff --git a/src/tools/calculateImageSize.test.js b/src/tools/calculateImageSize.test.js
new file mode 100644
index 00000000..b85c21a0
--- /dev/null
+++ b/src/tools/calculateImageSize.test.js
@@ -0,0 +1,127 @@
+import calculateImageSize from "./calculateImageSize";
+
+describe("Test calculateImageSizeForAxis function", () => {
+  it("The function should return an correct result for 0 sizes", () => {
+    expect(
+      calculateImageSize({
+        originalHeight: 0,
+        originalWidth: 0,
+        maxHiddenDots: 0,
+        dotSize: 0
+      })
+    ).toEqual({
+      height: 0,
+      width: 0,
+      hideYDots: 0,
+      hideXDots: 0
+    });
+  });
+  it("The function should return an correct result for minus values", () => {
+    expect(
+      calculateImageSize({
+        originalHeight: -1,
+        originalWidth: 5,
+        maxHiddenDots: 11,
+        dotSize: -5
+      })
+    ).toEqual({
+      height: 0,
+      width: 0,
+      hideYDots: 0,
+      hideXDots: 0
+    });
+  });
+  it("The function should return an correct result for small images", () => {
+    expect(
+      calculateImageSize({
+        originalHeight: 20,
+        originalWidth: 10,
+        maxHiddenDots: 1,
+        dotSize: 10
+      })
+    ).toEqual({
+      height: 10,
+      width: 5,
+      hideYDots: 1,
+      hideXDots: 1
+    });
+  });
+  it("The function should return an correct result for small images, if height is smaller than width", () => {
+    expect(
+      calculateImageSize({
+        originalHeight: 10,
+        originalWidth: 20,
+        maxHiddenDots: 1,
+        dotSize: 10
+      })
+    ).toEqual({
+      height: 5,
+      width: 10,
+      hideYDots: 1,
+      hideXDots: 1
+    });
+  });
+  it("The function should return an correct result for large images", () => {
+    expect(
+      calculateImageSize({
+        originalHeight: 1000,
+        originalWidth: 2020,
+        maxHiddenDots: 50,
+        dotSize: 10
+      })
+    ).toEqual({
+      height: 45,
+      width: 90,
+      hideYDots: 5,
+      hideXDots: 9
+    });
+  });
+  it("Use the maxHiddenAxisDots value for x", () => {
+    expect(
+      calculateImageSize({
+        originalHeight: 1000,
+        originalWidth: 2020,
+        maxHiddenDots: 50,
+        dotSize: 10,
+        maxHiddenAxisDots: 1
+      })
+    ).toEqual({
+      height: 5,
+      width: 10,
+      hideYDots: 1,
+      hideXDots: 1
+    });
+  });
+  it("Use the maxHiddenAxisDots value for y", () => {
+    expect(
+      calculateImageSize({
+        originalHeight: 2020,
+        originalWidth: 1000,
+        maxHiddenDots: 50,
+        dotSize: 10,
+        maxHiddenAxisDots: 1
+      })
+    ).toEqual({
+      height: 10,
+      width: 5,
+      hideYDots: 1,
+      hideXDots: 1
+    });
+  });
+  it("Use the maxHiddenAxisDots value for y with even value", () => {
+    expect(
+      calculateImageSize({
+        originalHeight: 2020,
+        originalWidth: 1000,
+        maxHiddenDots: 50,
+        dotSize: 10,
+        maxHiddenAxisDots: 2
+      })
+    ).toEqual({
+      height: 20,
+      width: 10,
+      hideYDots: 2,
+      hideXDots: 1
+    });
+  });
+});
diff --git a/src/tools/calculateImageSize.ts b/src/tools/calculateImageSize.ts
new file mode 100644
index 00000000..e976e92e
--- /dev/null
+++ b/src/tools/calculateImageSize.ts
@@ -0,0 +1,70 @@
+interface ImageSizeOptions {
+  originalHeight: number;
+  originalWidth: number;
+  maxHiddenDots: number;
+  maxHiddenAxisDots?: number;
+  dotSize: number;
+}
+
+interface ImageSizeResult {
+  height: number;
+  width: number;
+  hideYDots: number;
+  hideXDots: number;
+}
+
+export default function calculateImageSize({
+  originalHeight,
+  originalWidth,
+  maxHiddenDots,
+  maxHiddenAxisDots,
+  dotSize
+}: ImageSizeOptions): ImageSizeResult {
+  const hideDots = { x: 0, y: 0 };
+  const imageSize = { x: 0, y: 0 };
+
+  if (originalHeight <= 0 || originalWidth <= 0 || maxHiddenDots <= 0 || dotSize <= 0) {
+    return {
+      height: 0,
+      width: 0,
+      hideYDots: 0,
+      hideXDots: 0
+    };
+  }
+
+  const k = originalHeight / originalWidth;
+
+  //Getting the maximum possible axis hidden dots
+  hideDots.x = Math.floor(Math.sqrt(maxHiddenDots / k));
+  //The count of hidden dot's can't be less than 1
+  if (hideDots.x <= 0) hideDots.x = 1;
+  //Check the limit of the maximum allowed axis hidden dots
+  if (maxHiddenAxisDots && maxHiddenAxisDots < hideDots.x) hideDots.x = maxHiddenAxisDots;
+  //The count of dots should be odd
+  if (hideDots.x % 2 === 0) hideDots.x--;
+  imageSize.x = hideDots.x * dotSize;
+  //Calculate opposite axis hidden dots based on axis value.
+  //The value will be odd.
+  //We use ceil to prevent dots covering by the image.
+  hideDots.y = 1 + 2 * Math.ceil((hideDots.x * k - 1) / 2);
+  imageSize.y = Math.round(imageSize.x * k);
+  //If the result dots count is bigger than max - then decrease size and calculate again
+  if (hideDots.y * hideDots.x > maxHiddenDots || (maxHiddenAxisDots && maxHiddenAxisDots < hideDots.y)) {
+    if (maxHiddenAxisDots && maxHiddenAxisDots < hideDots.y) {
+      hideDots.y = maxHiddenAxisDots;
+      if (hideDots.y % 2 === 0) hideDots.x--;
+    } else {
+      hideDots.y -= 2;
+    }
+    imageSize.y = hideDots.y * dotSize;
+    hideDots.x = 1 + 2 * Math.ceil((hideDots.y / k - 1) / 2);
+    imageSize.x = Math.round(imageSize.y / k);
+  }
+
+  return {
+    height: imageSize.y,
+    width: imageSize.x,
+    hideYDots: hideDots.y,
+    hideXDots: hideDots.x
+  };
+}
diff --git a/src/tools/downloadURI.ts b/src/tools/downloadURI.ts
new file mode 100644
index 00000000..cb09c6b7
--- /dev/null
+++ b/src/tools/downloadURI.ts
@@ -0,0 +1,8 @@
+export default function downloadURI(uri: string, name: string): void {
+  const link = document.createElement("a");
+  link.download = name;
+  link.href = uri;
+  document.body.appendChild(link);
+  link.click();
+  document.body.removeChild(link);
+}
diff --git a/src/tools/getMode.js b/src/tools/getMode.js
deleted file mode 100644
index aac5913a..00000000
--- a/src/tools/getMode.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import modes from "../constants/modes";
-
-export default function getMode(data) {
-    switch (true) {
-        case /^[0-9]*$/.test(data):
-            return modes.numeric;
-        case /^[0-9A-Z $%*+\-./:]*$/.test(data):
-            return modes.alphanumeric;
-        default:
-            return modes.byte;
-    }
-}
\ No newline at end of file
diff --git a/src/tools/getMode.test.js b/src/tools/getMode.test.js
new file mode 100644
index 00000000..b450c678
--- /dev/null
+++ b/src/tools/getMode.test.js
@@ -0,0 +1,20 @@
+import getMode from "./getMode";
+import modes from "../constants/modes";
+
+describe("Test getMode function", () => {
+  it("Return numeric mode if numbers is passed", () => {
+    expect(getMode(123)).toBe(modes.numeric);
+  });
+  it("Return numeric mode if a string with numbers is passed", () => {
+    expect(getMode("123")).toBe(modes.numeric);
+  });
+  it("Return alphanumeric mode if a string with particular symbols is passed", () => {
+    expect(getMode("01ABCZ$%*+-./:01ABCZ$%*+-./:")).toBe(modes.alphanumeric);
+  });
+  it("Return byte mode if a string with all keyboard symbols is passed", () => {
+    expect(getMode("01ABCZ./:!@#$%^&*()_+01ABCZ./:!@#$%^&*()_'+|\\")).toBe(modes.byte);
+  });
+  it("Return byte mode if a string with Cyrillic symbols is passed", () => {
+    expect(getMode("абвАБВ")).toBe(modes.byte);
+  });
+});
diff --git a/src/tools/getMode.ts b/src/tools/getMode.ts
new file mode 100644
index 00000000..b9734183
--- /dev/null
+++ b/src/tools/getMode.ts
@@ -0,0 +1,12 @@
+import modes from "../constants/modes";
+
+export default function getMode(data: string): Mode {
+  switch (true) {
+    case /^[0-9]*$/.test(data):
+      return modes.numeric;
+    case /^[0-9A-Z $%*+\-./:]*$/.test(data):
+      return modes.alphanumeric;
+    default:
+      return modes.byte;
+  }
+}
diff --git a/src/tools/merge.js b/src/tools/merge.js
deleted file mode 100644
index 6369a1ec..00000000
--- a/src/tools/merge.js
+++ /dev/null
@@ -1,30 +0,0 @@
-const isObject = (obj) => obj && typeof obj === "object";
-
-export default function mergeDeep(target, ...sources) {
-    let source;
-
-    if (sources.length > 1) {
-        source = mergeDeep(...sources);
-    } else {
-        source = sources[0];
-    }
-
-    if (!isObject(target) || !isObject(source)) {
-        return target;
-    }
-
-    Object.keys(source).forEach(key => {
-        const targetValue = target[key];
-        const sourceValue = source[key];
-
-        if (Array.isArray(targetValue) && Array.isArray(sourceValue)) {
-            target[key] = targetValue.concat(sourceValue);
-        } else if (isObject(targetValue) && isObject(sourceValue)) {
-            target[key] = mergeDeep(Object.assign({}, targetValue), sourceValue);
-        } else {
-            target[key] = sourceValue;
-        }
-    });
-
-    return target;
-}
\ No newline at end of file
diff --git a/src/tools/merge.test.js b/src/tools/merge.test.js
new file mode 100644
index 00000000..0b3c5540
--- /dev/null
+++ b/src/tools/merge.test.js
@@ -0,0 +1,56 @@
+import mergeDeep from "./merge";
+
+describe("Test getMode function", () => {
+  const simpleObject = {
+    str: "foo"
+  };
+
+  const objectWithArray = {
+    arr: [1, 2]
+  };
+
+  const nestedObject = {
+    obj: {
+      foo: "foo"
+    }
+  };
+
+  const nestedObjectWithArray = {
+    obj: {
+      arr: [1, 2]
+    }
+  };
+
+  it("Merge two objects", () => {
+    expect(mergeDeep(simpleObject, { str: "bar" })).toEqual({ str: "bar" });
+  });
+  it("Merge two objects with arrays", () => {
+    expect(mergeDeep(objectWithArray, { arr: [3, 4] })).toEqual({ arr: [1, 2, 3, 4] });
+  });
+  it("Merge two objects with nested objects", () => {
+    expect(mergeDeep(nestedObject, { obj: { bar: "bar" } })).toEqual({ obj: { foo: "foo", bar: "bar" } });
+  });
+  it("Merge three objects with nested objects", () => {
+    expect(mergeDeep(nestedObjectWithArray, nestedObject, { obj: { arr: [3, 4] } })).toEqual({
+      obj: {
+        foo: "foo",
+        arr: [1, 2, 3, 4]
+      }
+    });
+  });
+  it("Don't mutate target", () => {
+    const target = {
+      str: "foo"
+    };
+
+    expect(mergeDeep(target, { str: "bar" })).not.toBe(target);
+  });
+  it("Skip undefined sources", () => {
+    expect(mergeDeep(simpleObject, undefined)).toBe(simpleObject);
+  });
+  it("Skip undefined sources dfs", () => {
+    const simpleArray = [1, 2];
+
+    expect(mergeDeep(simpleArray, [3, 4])).toEqual(simpleArray);
+  });
+});
diff --git a/src/tools/merge.ts b/src/tools/merge.ts
new file mode 100644
index 00000000..74668b09
--- /dev/null
+++ b/src/tools/merge.ts
@@ -0,0 +1,22 @@
+const isObject = (obj: object): boolean => !!obj && typeof obj === "object" && !Array.isArray(obj);
+
+export default function mergeDeep(target: UnknownObject, ...sources: UnknownObject[]): UnknownObject {
+  if (!sources.length) return target;
+  const source = sources.shift();
+  if (source === undefined || !isObject(target) || !isObject(source)) return target;
+  target = { ...target };
+  Object.keys(source).forEach((key: string): void => {
+    const targetValue = target[key];
+    const sourceValue = source[key];
+
+    if (Array.isArray(targetValue) && Array.isArray(sourceValue)) {
+      target[key] = targetValue.concat(sourceValue);
+    } else if (isObject(targetValue) && isObject(sourceValue)) {
+      target[key] = mergeDeep(Object.assign({}, targetValue), sourceValue);
+    } else {
+      target[key] = sourceValue;
+    }
+  });
+
+  return mergeDeep(target, ...sources);
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..97888e8b
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "outDir": "./lib/",
+        "sourceMap": true,
+        "module": "es6",
+        "target": "es5",
+        "allowJs": true,
+        "moduleResolution": "node",
+        "strict": true,
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "alwaysStrict": true,
+        "strictNullChecks": true,
+        "forceConsistentCasingInFileNames": true,
+        "noImplicitReturns": true,
+        "noUnusedLocals": true,
+        "esModuleInterop": true
+    },
+    "include": ["./src/**/*"]
+}
diff --git a/webpack.config.js b/webpack.config.js
new file mode 100644
index 00000000..f3efb85a
--- /dev/null
+++ b/webpack.config.js
@@ -0,0 +1,50 @@
+const path = require("path");
+const { CleanWebpackPlugin } = require("clean-webpack-plugin");
+
+const rootPath = path.resolve(__dirname, "./");
+const srcPath = path.resolve(rootPath, "src");
+const libPath = path.resolve(rootPath, "lib");
+
+const config = {
+  entry: srcPath + "/index.ts",
+  output: {
+    path: libPath,
+    filename: "qr-code-styling.js",
+    library: "QRCodeStyling",
+    libraryTarget: "umd",
+    libraryExport: "default"
+  },
+  module: {
+    rules: [
+      {
+        test: /\.ts$/,
+        loader: "ts-loader",
+        exclude: /node_modules/
+      },
+      {
+        enforce: "pre",
+        test: /\.ts$/,
+        loader: "eslint-loader",
+        exclude: /node_modules/
+      }
+    ]
+  },
+  plugins: [new CleanWebpackPlugin()],
+  resolve: {
+    extensions: [".ts", ".js"]
+  }
+};
+
+module.exports = (env, argv) => {
+  if (argv.mode === "development") {
+    config.devtool = "inline-source-map";
+    config.mode = argv.mode;
+  }
+
+  if (argv.mode === "production") {
+    config.devtool = "source-map";
+    config.mode = argv.mode;
+  }
+
+  return config;
+};