diff --git a/.editorconfig b/.editorconfig
index db4518e..afc8b77 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -2,11 +2,20 @@
 root = true
 
 [*]
-end_of_line = lf
-indent_style = space
-indent_size = 4
 charset = utf-8
+indent_style = space
+indent_size = 2
 insert_final_newline = true
+trim_trailing_whitespace = true
 
-[*.json]
-indent_size = 2
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false
+
+[*.ts]
+ij_typescript_spaces_within_imports = true
+ij_typescript_use_double_quotes = false
+ij_typescript_force_quote_style = true
+ij_typescript_import_sort_members = true
+ij_typescript_import_sort_module_name = true
+ij_typescript_spaces_within_object_literal_braces = true
diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..ec2bc4e
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,55 @@
+{
+  "env": {
+    "es6": true,
+    "node": true,
+    "browser": false,
+    "jest": true
+  },
+  "extends": [
+    "standard"
+  ],
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2019,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "@typescript-eslint"
+  ],
+  "rules": {
+    "semi": [
+      "error",
+      "always"
+    ],
+    "space-before-function-paren": [
+      "error",
+      {
+        "anonymous": "never",
+        "named": "never",
+        "asyncArrow": "always"
+      }
+    ],
+    "quotes": [
+      "error",
+      "single",
+      {
+        "avoidEscape": true,
+        "allowTemplateLiterals": true
+      }
+    ],
+    "quote-props": ["error", "consistent-as-needed"],
+    "import/no-duplicates": "off",
+    "no-useless-escape": "off",
+    "no-return-assign": "off",
+    "no-prototype-builtins": "off",
+    "prefer-promise-reject-errors": "off",
+    "@typescript-eslint/interface-name-prefix": ["error", { "prefixWithI": "always" }],
+    "no-unused-vars": "off",
+    "generator-star-spacing": ["error", {"before": false, "after": true}],
+    "yield-star-spacing": ["error", {"before": false, "after": true}]
+  }
+}
diff --git a/.gitignore b/.gitignore
index fe6172b..db22166 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,7 @@
 /coverage
 /inputDir
 /outputDir
+
+.tsbuildinfo
+/gzip-cli-*.tgz
+/dist
diff --git a/.npmignore b/.npmignore
index 5d18b52..9bd227f 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,3 +1,2 @@
-/.idea
-.editorconfig
-.npmignore
+/dist/!(index).d.ts
+/!(package.json)
diff --git a/LICENSE b/LICENSE
index eadf833..8f9655b 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018 Siarhei Pakhuta
+Copyright (c) 2020 Siarhei Pakhuta
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 0ce27d7..4451969 100644
--- a/README.md
+++ b/README.md
@@ -5,48 +5,98 @@
 
 
 # gzip-cli
-Provide possibility to gzip files from npm script section. Also you can use it in your code as imported module.
+`gzip-cli` provides CLI for compressing files by using compress algorithms such as Gzip and Brotli.
 
 ### Install
 
 ```bash
 npm i gzip-cli
 ```
-### Command Line
-
+## CLI usage
 ```bash
 Usage: gzip [glob patterns]
 
 Options:
 -o, --output               output directory
--e, --extension            output file extension (default=gz)
+-e, --extension            output file extension (default=gz). Also supported a few extensions in one command
 ```
 
 #### CLI example
 ```bash
 gzip dist/**/*.js
 ```
-Will gzip all `*.js` files in folder `dist` and output them to the same folder, e.g.
+All `*.js` files in folder `dist` and its sub-folders will be compressed by Gzip algorithm and put them to the same folder, e.g.
 
-`dist/public/main.js` -> `dist/public/main.js.gz`
+```bash
+gzip dist/**/*.js --extension=gz --extension=br
+```
+All `*.js` files in folder `dist` and its sub-folders will be compressed by Gzip and Brotli algorithm and put them to the same folder, e.g.
+```bash
+dist/public/main.js` -> `dist/public/main.js.gz
+dist/public/main.js` -> `dist/public/main.js.br
+```
 
 ```bash
 gzip source/**/*.js --output=dist
 ```
-Will gzip all `*.js` files in folder `source` and output them to the `dist` folder with saving file paths relative to glob base, e.g.
+All `*.js` files in folder `source` and its sub-folders will be compressed by Gzip algorithm and put them to the `dist` folder with saving file paths relative to a glob pattern base, e.g.
 
 `source/utils/fileUtils.js` -> `dist/utils/fileUtils.js.gz`
 
-## gzip(patterns, [outputDir])
+#### CLI example of using in a "scripts" section of your package.json
+Compress all `*.js` files in folder `dist`:
+```bash
+"scripts": {
+  "gzip": "gzip dist/**/*.js"
+}
+```
+
+Build Angular application and compress all `*.js` files in folder `dist`:
+```bash
+"scripts": {
+  "build": "ng build && gzip dist/**/*.js"
+}
+```
 
-* `patterns` `{Array<String>}` Patterns to be matched
-* `outputDir` `{String}` Output dir
+Build React application and compress all `*.js` files in folder `build` by Gzip and Brotli algorithm:
+```bash
+"scripts": {
+  "build": "react-scripts build && gzip build/**/*.js --extension=gz --extension=br"
+}
+```
+
+## Module usage
+### gzip(options)
+
+* `options.patterns` `{String[]}` Array of patterns to be matched
+* `outputDir` `{String} <optional>` Output dir
+* `outputExtensions` `{String[]} <optional>` Array of output file extension. `br` - for Brotli algorithm, `gz` or others - for Gzip algorithm.
+
+### Module example
+`gzip-cli` can be used like a regular module:
 
-### Code example
 ```javascript
-const gzib = require('gzib');
-gzip(['source/**/*.js'], 'dist');
+const gzip = require('gzip-cli').gzip;
+gzip({patterns: ['dist/public/**/*.{html,css,js}'], outputExtensions: ['gz', 'br']});
+```
+All `*.html`, `*.css` and `*.js` files in folder `dist/public` and its sub-folders will be compressed by Gzip and Brotli algorithm and put them to the same folder, e.g.
+
+```bash
+dist/public/main.js` -> `dist/public/main.js.gz
+dist/public/main.js` -> `dist/public/main.js.br
 ```
-Will gzip all `*.js` files in folder `source` and its sub-folders and output them to the `dist` folder with saving file paths relative to glob base, e.g.
 
-`source/public/main.js` -> `dist/public/main.js.gz`
+`gzip({...})` returns a promise which will be resolved when all resources will be compressed.
+
+#### Module example of using in a Gulp task
+```javascript
+const gzip = require('gzip-cli').gzip;
+gulp.task('compress-static-files', () => {
+  return gzip({patterns: ['dist/public/**/*.{html,css,js}'], outputExtensions: ['gz', 'br']});
+});
+```
+All `*.html`, `*.css` and `*.js` files in folder `dist/public` and its sub-folders will be compressed by Gzip and Brotli algorithm and put them to the same folder.
+
+### Requirements
+
+Node.js >= 12
diff --git a/jest.config.js b/jest.config.js
index f0cf21d..4cc19c5 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,9 +1,18 @@
 const {defaults} = require('jest-config');
 
 module.exports = {
-    coveragePathIgnorePatterns : [
-        ...defaults.coveragePathIgnorePatterns,
-        '/test/utils/',
-        '/test/config.js'
-    ]
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+
+  globals: {
+    'ts-jest': {
+      tsConfig: 'tsconfig.spec.json'
+    }
+  },
+  coveragePathIgnorePatterns: [
+    ...defaults.coveragePathIgnorePatterns,
+    '/test/utils/',
+    '/test/config.js'
+  ]
 };
diff --git a/package-lock.json b/package-lock.json
index 96b1884..3fd5759 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "gzip-cli",
-  "version": "1.0.4",
+  "version": "1.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -424,6 +424,35 @@
         "@babel/types": "^7.3.0"
       }
     },
+    "@types/eslint-visitor-keys": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
+      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
+      "dev": true
+    },
+    "@types/events": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
+      "integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
+      "dev": true
+    },
+    "@types/glob": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
+      "integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
+      "dev": true,
+      "requires": {
+        "@types/events": "*",
+        "@types/minimatch": "*",
+        "@types/node": "*"
+      }
+    },
+    "@types/glob-parent": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@types/glob-parent/-/glob-parent-5.1.0.tgz",
+      "integrity": "sha512-XSqsa1R1xG8nCW4DUiedQ+t51y+OqK7wjArns7vjbphqODs6t49VwFGDDwIVBW5ZJQTuz52n671Qa6P1Wysa0A==",
+      "dev": true
+    },
     "@types/istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -449,6 +478,49 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "@types/jest": {
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-24.9.0.tgz",
+      "integrity": "sha512-dXvuABY9nM1xgsXlOtLQXJKdacxZJd7AtvLsKZ/0b57ruMXDKCOXAC/M75GbllQX6o1pcZ5hAG4JzYy7Z/wM2w==",
+      "dev": true,
+      "requires": {
+        "jest-diff": "^24.3.0"
+      }
+    },
+    "@types/json-schema": {
+      "version": "7.0.4",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.4.tgz",
+      "integrity": "sha512-8+KAKzEvSUdeo+kmqnKrqgeE+LcA0tjYWFY7RPProVYwnqDjukzO+3b6dLD56rYX5TdWejnEOLJYOIeh4CXKuA==",
+      "dev": true
+    },
+    "@types/minimatch": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
+      "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
+      "dev": true
+    },
+    "@types/minimist": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@types/minimist/-/minimist-1.2.0.tgz",
+      "integrity": "sha1-aaI6OtKcrwCX8G7aWbNh7i8GOfY=",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "13.1.8",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-13.1.8.tgz",
+      "integrity": "sha512-6XzyyNM9EKQW4HKuzbo/CkOIjn/evtCmsU+MUM1xDfJ+3/rNjBttM1NgN7AOQvN6tP1Sl1D1PIKMreTArnxM9A==",
+      "dev": true
+    },
+    "@types/rimraf": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@types/rimraf/-/rimraf-2.0.3.tgz",
+      "integrity": "sha512-dZfyfL/u9l/oi984hEXdmAjX3JHry7TLWw43u1HQ8HhPv6KtfxnrZ3T/bleJ0GEvnk9t5sM7eePkgMqz3yBcGg==",
+      "dev": true,
+      "requires": {
+        "@types/glob": "*",
+        "@types/node": "*"
+      }
+    },
     "@types/stack-utils": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-1.0.1.tgz",
@@ -461,6 +533,280 @@
       "integrity": "sha512-SOhuU4wNBxhhTHxYaiG5NY4HBhDIDnJF60GU+2LqHAdKKer86//e4yg69aENCtQ04n0ovz+tq2YPME5t5yp4pw==",
       "dev": true
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "2.17.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.17.0.tgz",
+      "integrity": "sha512-tg/OMOtPeXlvk0ES8mZzEZ4gd1ruSE03nsKcK+teJhxYv5CPCXK6Mb/OK6NpB4+CqGTHs4MVeoSZXNFqpT1PyQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "2.17.0",
+        "eslint-utils": "^1.4.3",
+        "functional-red-black-tree": "^1.0.1",
+        "regexpp": "^3.0.0",
+        "tsutils": "^3.17.1"
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "2.17.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-2.17.0.tgz",
+      "integrity": "sha512-2bNf+mZ/3mj5/3CP56v+ldRK3vFy9jOvmCPs/Gr2DeSJh+asPZrhFniv4QmQsHWQFPJFWhFHgkGgJeRmK4m8iQ==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/typescript-estree": "2.17.0",
+        "eslint-scope": "^5.0.0"
+      },
+      "dependencies": {
+        "eslint-scope": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.0.0.tgz",
+          "integrity": "sha512-oYrhJW7S0bxAFDvWqzvMPRm6pcgcnWc4QnofCAqRTRfQC0JcwenzGglTtsLyIuuWFfkqDG9vz67cnttSd53djw==",
+          "dev": true,
+          "requires": {
+            "esrecurse": "^4.1.0",
+            "estraverse": "^4.1.1"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "2.17.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-2.17.0.tgz",
+      "integrity": "sha512-k1g3gRQ4fwfJoIfgUpz78AovicSWKFANmvTfkAHP24MgJHjWfZI6ya7tsQZt1sLczvP4G9BE5G5MgADHdmJB/w==",
+      "dev": true,
+      "requires": {
+        "@types/eslint-visitor-keys": "^1.0.0",
+        "@typescript-eslint/experimental-utils": "2.17.0",
+        "@typescript-eslint/typescript-estree": "2.17.0",
+        "eslint-visitor-keys": "^1.1.0"
+      }
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "2.17.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-2.17.0.tgz",
+      "integrity": "sha512-g0eVRULGnEEUakxRfJO0s0Hr1LLQqsI6OrkiCLpdHtdJJek+wyd8mb00vedqAoWldeDcOcP8plqw8/jx9Gr3Lw==",
+      "dev": true,
+      "requires": {
+        "debug": "^4.1.1",
+        "eslint-visitor-keys": "^1.1.0",
+        "glob": "^7.1.6",
+        "is-glob": "^4.0.1",
+        "lodash": "^4.17.15",
+        "semver": "^6.3.0",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
+    "@webassemblyjs/ast": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.8.5.tgz",
+      "integrity": "sha512-aJMfngIZ65+t71C3y2nBBg5FFG0Okt9m0XEgWZ7Ywgn1oMAT8cNwx00Uv1cQyHtidq0Xn94R4TAywO+LCQ+ZAQ==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/helper-module-context": "1.8.5",
+        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
+        "@webassemblyjs/wast-parser": "1.8.5"
+      }
+    },
+    "@webassemblyjs/floating-point-hex-parser": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/floating-point-hex-parser/-/floating-point-hex-parser-1.8.5.tgz",
+      "integrity": "sha512-9p+79WHru1oqBh9ewP9zW95E3XAo+90oth7S5Re3eQnECGq59ly1Ri5tsIipKGpiStHsUYmY3zMLqtk3gTcOtQ==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-api-error": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-api-error/-/helper-api-error-1.8.5.tgz",
+      "integrity": "sha512-Za/tnzsvnqdaSPOUXHyKJ2XI7PDX64kWtURyGiJJZKVEdFOsdKUCPTNEVFZq3zJ2R0G5wc2PZ5gvdTRFgm81zA==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-buffer": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-buffer/-/helper-buffer-1.8.5.tgz",
+      "integrity": "sha512-Ri2R8nOS0U6G49Q86goFIPNgjyl6+oE1abW1pS84BuhP1Qcr5JqMwRFT3Ah3ADDDYGEgGs1iyb1DGX+kAi/c/Q==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-code-frame": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-code-frame/-/helper-code-frame-1.8.5.tgz",
+      "integrity": "sha512-VQAadSubZIhNpH46IR3yWO4kZZjMxN1opDrzePLdVKAZ+DFjkGD/rf4v1jap744uPVU6yjL/smZbRIIJTOUnKQ==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/wast-printer": "1.8.5"
+      }
+    },
+    "@webassemblyjs/helper-fsm": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-fsm/-/helper-fsm-1.8.5.tgz",
+      "integrity": "sha512-kRuX/saORcg8se/ft6Q2UbRpZwP4y7YrWsLXPbbmtepKr22i8Z4O3V5QE9DbZK908dh5Xya4Un57SDIKwB9eow==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-module-context": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-module-context/-/helper-module-context-1.8.5.tgz",
+      "integrity": "sha512-/O1B236mN7UNEU4t9X7Pj38i4VoU8CcMHyy3l2cV/kIF4U5KoHXDVqcDuOs1ltkac90IM4vZdHc52t1x8Yfs3g==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "mamacro": "^0.0.3"
+      }
+    },
+    "@webassemblyjs/helper-wasm-bytecode": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-wasm-bytecode/-/helper-wasm-bytecode-1.8.5.tgz",
+      "integrity": "sha512-Cu4YMYG3Ddl72CbmpjU/wbP6SACcOPVbHN1dI4VJNJVgFwaKf1ppeFJrwydOG3NDHxVGuCfPlLZNyEdIYlQ6QQ==",
+      "dev": true
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+      "dev": true,
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+        "graceful-fs": "^4.1.2",
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+      }
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.41.5.tgz",
+      "integrity": "sha512-wp0Co4vpyumnp3KlkmpM5LWuzvZYayDwM2n17EHFr4qxBBbRokC7DJawPJC7TfSFZ9HZ6GsdH40EBj4UV0nmpw==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "@webassemblyjs/helper-module-context": "1.8.5",
+        "@webassemblyjs/wasm-edit": "1.8.5",
+        "@webassemblyjs/wasm-parser": "1.8.5",
+        "acorn": "^6.2.1",
+        "ajv": "^6.10.2",
+        "ajv-keywords": "^3.4.1",
+        "chrome-trace-event": "^1.0.2",
+        "enhanced-resolve": "^4.1.0",
+        "eslint-scope": "^4.0.3",
+        "json-parse-better-errors": "^1.0.2",
+        "loader-runner": "^2.4.0",
+        "loader-utils": "^1.2.3",
+        "memory-fs": "^0.4.1",
+        "micromatch": "^3.1.10",
+        "mkdirp": "^0.5.1",
+        "neo-async": "^2.6.1",
+        "node-libs-browser": "^2.2.1",
+        "schema-utils": "^1.0.0",
+        "tapable": "^1.1.3",
+        "terser-webpack-plugin": "^1.4.3",
+        "watchpack": "^1.6.0",
+        "webpack-sources": "^1.4.1"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "6.4.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.0.tgz",
+          "integrity": "sha512-gac8OEcQ2Li1dxIEWGZzsp2BitJxwkwcOm0zHAJLcPJaVvm58FRnk6RkuLRpU1EujipU2ZFODv2P9DLMfnV8mw==",
+          "dev": true
+        },
+        "memory-fs": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/memory-fs/-/memory-fs-0.4.1.tgz",
+          "integrity": "sha1-OpoguEYlI+RHz7x+i7gO1me/xVI=",
+          "dev": true,
+          "requires": {
+            "errno": "^0.1.3",
+            "readable-stream": "^2.0.1"
+          }
+        }
+      }
+    },
+    "webpack-cli": {
+      "version": "3.3.10",
+      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.10.tgz",
+      "integrity": "sha512-u1dgND9+MXaEt74sJR4PR7qkPxXUSQ0RXYq8x1L6Jg1MYVEmGPrH6Ah6C4arD4r0J1P5HKjRqpab36k0eIzPqg==",
+      "dev": true,
+      "requires": {
+        "chalk": "2.4.2",
+        "cross-spawn": "6.0.5",
+        "enhanced-resolve": "4.1.0",
+        "findup-sync": "3.0.0",
+        "global-modules": "2.0.0",
+        "import-local": "2.0.0",
+        "interpret": "1.2.0",
+        "loader-utils": "1.2.3",
+        "supports-color": "6.1.0",
+        "v8-compile-cache": "2.0.3",
+        "yargs": "13.2.4"
+      },
+      "dependencies": {
+        "cliui": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
+          "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
+          "dev": true,
+          "requires": {
+            "string-width": "^3.1.0",
+            "strip-ansi": "^5.2.0",
+            "wrap-ansi": "^5.1.0"
+          }
+        },
+        "enhanced-resolve": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-4.1.0.tgz",
+          "integrity": "sha512-F/7vkyTtyc/llOIn8oWclcB25KdRaiPBpZYDgJHgh/UHtpgT2p2eldQgtQnLtUvfMKPKxbRaQM/hHkvLHt1Vng==",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.2",
+            "memory-fs": "^0.4.0",
+            "tapable": "^1.0.0"
+          }
+        },
+        "get-caller-file": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+          "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+          "dev": true
+        },
+        "memory-fs": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/memory-fs/-/memory-fs-0.4.1.tgz",
+          "integrity": "sha1-OpoguEYlI+RHz7x+i7gO1me/xVI=",
+          "dev": true,
+          "requires": {
+            "errno": "^0.1.3",
+            "readable-stream": "^2.0.1"
+          }
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "supports-color": {
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        },
+        "wrap-ansi": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+          "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.0",
+            "string-width": "^3.0.0",
+            "strip-ansi": "^5.0.0"
+          }
+        },
+        "yargs": {
+          "version": "13.2.4",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
+          "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==",
+          "dev": true,
+          "requires": {
+            "cliui": "^5.0.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^2.0.1",
+            "os-locale": "^3.1.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^2.0.0",
+            "set-blocking": "^2.0.0",
+            "string-width": "^3.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^4.0.0",
+            "yargs-parser": "^13.1.0"
+          }
+        },
+        "yargs-parser": {
+          "version": "13.1.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+          "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
+    },
+    "webpack-node-externals": {
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/webpack-node-externals/-/webpack-node-externals-1.7.2.tgz",
+      "integrity": "sha512-ajerHZ+BJKeCLviLUUmnyd5B4RavLF76uv3cs6KNuO8W+HuQaEs0y0L7o40NQxdPy5w0pcv8Ew7yPUAQG0UdCg==",
+      "dev": true
+    },
+    "webpack-sources": {
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.4.3.tgz",
+      "integrity": "sha512-lgTS3Xhv1lCOKo7SA5TjKXMjpSM4sBjNV5+q2bqesbSPs5FjGmU6jjtBSkX9b4qW87vDIsCIlUPOEhbZrMdjeQ==",
+      "dev": true,
+      "requires": {
+        "source-list-map": "^2.0.0",
+        "source-map": "~0.6.1"
+      }
+    },
     "whatwg-encoding": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
@@ -4913,12 +7940,27 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wordwrap": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
       "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
       "dev": true
     },
+    "worker-farm": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.7.0.tgz",
+      "integrity": "sha512-rvw3QTZc8lAxyVrqcSGVm5yP/IJ2UcB3U0graE3LCFoZ0Yn2x4EoVSqJKdB/T5M+FLcRPjz4TDacRf3OCfNUzw==",
+      "dev": true,
+      "requires": {
+        "errno": "~0.1.7"
+      }
+    },
     "wrap-ansi": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
@@ -4971,6 +8013,15 @@
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
+    "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",
@@ -4997,12 +8048,24 @@
       "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
       "dev": true
     },
+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+      "dev": true
+    },
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
       "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
       "dev": true
     },
+    "yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
+      "dev": true
+    },
     "yargs": {
       "version": "12.0.5",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
diff --git a/package.json b/package.json
index f2019de..771f6c9 100644
--- a/package.json
+++ b/package.json
@@ -1,10 +1,18 @@
 {
   "name": "gzip-cli",
-  "version": "1.0.4",
+  "version": "1.1.0",
   "description": "gzip files",
-  "main": "src/index.js",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "bin": {
+    "gzip": "dist/index.js"
+  },
   "scripts": {
-    "test": "jest --coverage --coverageReporters=text-lcov | coveralls"
+    "build": "npm run lint && webpack --env.NODE_ENV=production",
+    "build:local": "webpack --env.NODE_ENV=development",
+    "lint": "eslint {src,test}/**/*.ts",
+    "test": "jest --coverage --coverageReporters=text-lcov | coveralls",
+    "test:local": "jest"
   },
   "repository": {
     "type": "git",
@@ -13,7 +21,12 @@
   "keywords": [
     "gzip-cli",
     "gzip",
-    "glob"
+    "glob",
+    "brotli",
+    "cli",
+    "zip",
+    "zlip",
+    "compression"
   ],
   "author": "Siarhei Pakhuta",
   "license": "MIT",
@@ -22,16 +35,33 @@
   },
   "homepage": "https://github.com/pakhuta/gzip-cli#readme",
   "dependencies": {
-    "glob": "~7.1.4",
-    "glob-parent": "~5.0.0",
-    "minimist": "~1.2.0"
-  },
-  "bin": {
-    "gzip": "./src/index.js"
+    "glob": "^7.1.6",
+    "glob-parent": "^5.1.0",
+    "minimist": "^1.2.0"
   },
   "devDependencies": {
+    "@types/glob": "^7.1.1",
+    "@types/glob-parent": "^5.1.0",
+    "@types/jest": "^24.9.0",
+    "@types/minimist": "^1.2.0",
+    "@types/rimraf": "^2.0.3",
+    "@typescript-eslint/eslint-plugin": "^2.17.0",
+    "@typescript-eslint/parser": "^2.17.0",
     "coveralls": "~3.0.5",
+    "eslint": "^6.8.0",
+    "eslint-config-standard": "^14.1.0",
+    "eslint-plugin-import": "^2.20.0",
+    "eslint-plugin-node": "^11.0.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-standard": "^4.0.1",
     "jest": "~24.8.0",
-    "rimraf": "~2.6.3"
+    "rimraf": "~2.6.3",
+    "ts-jest": "^24.3.0",
+    "ts-loader": "^6.2.1",
+    "tslib": "^1.10.0",
+    "typescript": "^3.7.5",
+    "webpack": "^4.41.5",
+    "webpack-cli": "^3.3.10",
+    "webpack-node-externals": "^1.7.2"
   }
 }
diff --git a/src/fileUtils.js b/src/fileUtils.js
deleted file mode 100644
index ff2d715..0000000
--- a/src/fileUtils.js
+++ /dev/null
@@ -1,35 +0,0 @@
-const fs = require('fs');
-const path = require('path');
-const glob = require('glob');
-
-class FileUtils {
-    static getReadStream(filePath) {
-        return fs.createReadStream(filePath);
-    }
-
-    static getWriteStream(filePath) {
-        return fs.createWriteStream(filePath);
-    }
-
-    static getFilePathsFromGlob(pattern) {
-        return new Promise((resolve, reject) => {
-            glob(pattern, (err, files) => (err) ? (reject(err)) : (resolve(files)));
-        });
-    }
-
-    static getOutputFilePath(filePath, runParams, globBase) {
-        const {outputDir, outputExtension} = runParams;
-
-        return outputDir ? (path.join(outputDir, `${filePath.slice(globBase.length)}.${outputExtension}`)) : (`${filePath}.${outputExtension}`);
-    }
-
-    static ensureOutputDir(outputDir) {
-        try {
-            fs.accessSync(outputDir, fs.constants.F_OK);
-        } catch (err) {
-            fs.mkdirSync(outputDir);
-        }
-    }
-}
-
-module.exports = FileUtils;
diff --git a/src/fileUtils.ts b/src/fileUtils.ts
new file mode 100644
index 0000000..0c3e6dd
--- /dev/null
+++ b/src/fileUtils.ts
@@ -0,0 +1,34 @@
+import { join } from 'path';
+import { accessSync, constants, mkdirSync, createReadStream, createWriteStream, ReadStream, WriteStream } from 'fs';
+import * as glob from 'glob';
+import { IRunParameters } from './index';
+
+export default class FileUtils {
+  static getReadStream(filePath: string): ReadStream {
+    return createReadStream(filePath);
+  }
+
+  static getWriteStream(filePath: string): WriteStream {
+    return createWriteStream(filePath);
+  }
+
+  static getFilePathsFromGlob(pattern: string): Promise<string[]> {
+    return new Promise((resolve, reject) => {
+      glob(pattern, (err, files) => (err) ? (reject(err)) : (resolve(files)));
+    });
+  }
+
+  static getOutputFilePath(filePath: string, runParams: IRunParameters, globBase: string): string {
+    const { outputDir } = runParams;
+
+    return outputDir ? join(outputDir, filePath.slice(globBase.length)) : filePath;
+  }
+
+  static ensureOutputDir(outputDir: string) {
+    try {
+      accessSync(outputDir, constants.F_OK);
+    } catch (err) {
+      mkdirSync(outputDir);
+    }
+  }
+}
diff --git a/src/generatorUtils.js b/src/generatorUtils.js
deleted file mode 100644
index b83b44d..0000000
--- a/src/generatorUtils.js
+++ /dev/null
@@ -1,21 +0,0 @@
-class GeneratorUtils {
-    static execute(generator, yieldValue) {
-        return new Promise((resolve, reject) => {
-            let next = generator.next(yieldValue);
-
-            if (!next.done) {
-                next.value
-                    .then(result => GeneratorUtils.execute(generator, result))
-                    .then(() => resolve())
-                    .catch(err => {
-                        generator.throw(err);
-                        reject(err);
-                    });
-            } else {
-                resolve();
-            }
-        });
-    }
-}
-
-module.exports = GeneratorUtils;
diff --git a/src/generatorUtils.ts b/src/generatorUtils.ts
new file mode 100644
index 0000000..84afbcb
--- /dev/null
+++ b/src/generatorUtils.ts
@@ -0,0 +1,19 @@
+export default class GeneratorUtils {
+  static execute(generator: Generator<Promise<string>, Promise<string>, string>, yieldValue?: string): Promise<void> {
+    return new Promise((resolve, reject) => {
+      const next = generator.next(yieldValue);
+
+      if (!next.done) {
+        next.value
+          .then(result => GeneratorUtils.execute(generator, result))
+          .then(() => resolve())
+          .catch(err => {
+            generator.throw(err);
+            reject(err);
+          });
+      } else {
+        resolve();
+      }
+    });
+  }
+}
diff --git a/src/index.js b/src/index.js
deleted file mode 100644
index b7f3e61..0000000
--- a/src/index.js
+++ /dev/null
@@ -1,83 +0,0 @@
-#!/usr/bin/env node
-const zlib = require('zlib');
-const globParent = require('glob-parent');
-const parseArgs = require('minimist');
-const FileUtils = require('./fileUtils');
-const GeneratorUtils = require('./generatorUtils');
-
-function gzip(runParams) {
-    if (runParams.outputDir) {
-        FileUtils.ensureOutputDir(runParams.outputDir);
-    }
-
-    return GeneratorUtils.execute(handlePatterns(runParams));
-}
-
-function gzipFile(filePath, outputFilePath) {
-    return new Promise(resolve => {
-        FileUtils.getReadStream(filePath)
-            .pipe(zlib.createGzip())
-            .pipe(FileUtils.getWriteStream(outputFilePath))
-            .on('finish', resolve);
-    });
-}
-
-function* handlePatterns(runParams) {
-    for (let i = 0; i < runParams.patterns.length; i++) {
-        yield* gzipPattern(runParams.patterns[i], runParams);
-    }
-}
-
-function* gzipPattern(pattern, runParams) {
-    const filePaths = yield FileUtils.getFilePathsFromGlob(pattern);
-    const globBase = globParent(pattern);
-
-    for (let i = 0; i < filePaths.length; i++) {
-        const filePath = filePaths[i];
-        const outputFilePath = FileUtils.getOutputFilePath(filePath, runParams, globBase);
-        yield gzipFile(filePath, outputFilePath);
-    }
-}
-
-function getArgv() {
-    return parseArgs(process.argv.slice(2), {
-        alias: {
-            'output': 'o',
-            'extension': 'e'
-        },
-        string: ['output', 'extension'],
-        default: {
-            output: null,
-            extension: 'gz'
-        }
-    });
-}
-
-function getRunParameters() {
-    const argv = getArgv();
-
-    return {
-        patterns: argv._,
-        outputDir: argv.output,
-        outputExtension: argv.extension,
-    };
-}
-
-function run() {
-    if (module.parent) {
-        return;
-    }
-
-    const runParams = getRunParameters();
-
-    if (!runParams.patterns.length) {
-        process.stderr.write('gzip: no one pattern is not specified. Operation is skipped.');
-        return;
-    }
-
-    gzip(runParams);
-}
-
-run();
-
-module.exports = gzip;
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..e57783d
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,99 @@
+import { createGzip, createBrotliCompress } from 'zlib';
+import * as globParent from 'glob-parent';
+import * as parseArgs from 'minimist';
+import FileUtils from './fileUtils';
+import GeneratorUtils from './generatorUtils';
+
+export interface IRunParameters {
+  patterns: string[],
+  outputDir?: string,
+  outputExtensions?: string[]
+}
+
+interface IArgParams {
+  _: string[];
+  output: string;
+  extension: string | string[];
+}
+
+export function gzip(runParams: IRunParameters): Promise<void> {
+  if (runParams.outputDir) {
+    FileUtils.ensureOutputDir(runParams.outputDir);
+  }
+
+  return GeneratorUtils.execute(handlePatterns(runParams));
+}
+
+function gzipFile(filePath: string, outputFilePath: string, outputExtension: string | string[]): Promise<void> | Promise<void[]> {
+  if (Array.isArray(outputExtension)) {
+    return Promise.all(outputExtension.map(extension => gzipFile(filePath, outputFilePath, extension) as Promise<void>));
+  }
+
+  const outputFilePathWitExtension = `${outputFilePath}.${outputExtension}`;
+  const compressionMethod = outputExtension === 'br' ? createBrotliCompress : createGzip;
+
+  return new Promise<void>(resolve => {
+    FileUtils.getReadStream(filePath)
+      .pipe(compressionMethod())
+      .pipe(FileUtils.getWriteStream(outputFilePathWitExtension))
+      .on('finish', resolve);
+  });
+}
+
+function* handlePatterns(runParams: IRunParameters): Generator<any, any, any> {
+  for (let i = 0; i < runParams.patterns.length; i++) {
+    yield* gzipPattern(runParams.patterns[i], runParams);
+  }
+}
+
+function* gzipPattern(pattern: string, runParams: IRunParameters): Generator<any, any, any> {
+  const filePaths = yield FileUtils.getFilePathsFromGlob(pattern);
+  const globBase = globParent(pattern);
+
+  for (let i = 0; i < filePaths.length; i++) {
+    const filePath = filePaths[i];
+    const outputFilePath = FileUtils.getOutputFilePath(filePath, runParams, globBase);
+    yield gzipFile(filePath, outputFilePath, runParams.outputExtensions);
+  }
+}
+
+function getArgv(): IArgParams {
+  return parseArgs<IArgParams>(process.argv.slice(2), {
+    alias: {
+      output: 'o',
+      extension: 'e'
+    },
+    string: ['output', 'extension'],
+    default: {
+      output: null,
+      extension: 'gz'
+    }
+  });
+}
+
+function getRunParameters(): IRunParameters {
+  const argv = getArgv();
+
+  return {
+    patterns: argv._,
+    outputDir: argv.output,
+    outputExtensions: Array.isArray(argv.extension) ? argv.extension : [argv.extension]
+  };
+}
+
+function run() {
+  if (module.parent) {
+    return;
+  }
+
+  const runParams = getRunParameters();
+
+  if (!runParams.patterns.length) {
+    process.stderr.write('gzip-cli: no one pattern is specified. Operation is skipped.');
+    return;
+  }
+
+  gzip(runParams);
+}
+
+run();
diff --git a/test/api.test.js b/test/api.test.js
deleted file mode 100644
index a5c23a8..0000000
--- a/test/api.test.js
+++ /dev/null
@@ -1,37 +0,0 @@
-const path = require('path');
-const gzip = require('../src/index');
-const FileUtils = require('./utils/fileUtils');
-const config = require('./config');
-
-describe('gzip files from API', () => {
-    beforeEach(() => {
-        return FileUtils.removeFolder(config.inputDir)
-            .then(() => FileUtils.removeFolder(config.outputDir))
-            .then(() => FileUtils.generateFile(config.generatedFilePath));
-    });
-
-    test('Check is gzip file created in the same folder', async () => {
-        const outputFile = `${config.generatedFilePath}.gz`;
-        const runParams = {
-            patterns: [path.join(config.inputDir, '*.*')],
-            outputExtension: 'gz'
-        };
-        const gzipPromise = gzip(runParams);
-
-        await expect(gzipPromise.then(() => FileUtils.isExist(outputFile)))
-            .resolves.toBeUndefined();
-    });
-
-    test('Check is gzip file created in a custom folder', async () => {
-        const outputFile = path.join(config.outputDir, `${config.generatedFile}.gz`);
-        const runParams = {
-            patterns: [path.join(config.inputDir, '*.*')],
-            outputDir: config.outputDir,
-            outputExtension: 'gz'
-        };
-        const gzipPromise = gzip(runParams);
-
-        await expect(gzipPromise.then(() => FileUtils.isExist(outputFile)))
-            .resolves.toBeUndefined();
-    });
-});
diff --git a/test/api.test.ts b/test/api.test.ts
new file mode 100644
index 0000000..e2540ea
--- /dev/null
+++ b/test/api.test.ts
@@ -0,0 +1,54 @@
+import { join } from 'path';
+import { gzip, IRunParameters } from '../src';
+import FileUtils from './utils/fileUtils';
+import config from './config';
+
+describe('gzip files from API', () => {
+  beforeEach(async () => {
+    await FileUtils.removeFolder(config.inputDir);
+    await FileUtils.removeFolder(config.outputDir);
+    await FileUtils.generateFile(config.generatedFilePath);
+  });
+
+  test('Check if gzip file is created in the same folder', async () => {
+    const runParams: IRunParameters = {
+      patterns: [join(config.inputDir, '*.*')],
+      outputDir: '',
+      outputExtensions: ['gz']
+    };
+
+    await gzip(runParams);
+    const isFileExist = await FileUtils.isExist(`${config.generatedFilePath}.gz`);
+
+    expect(isFileExist).toBe(true);
+  });
+
+  test('Check if gzip and brotli files are created in the same folder', async () => {
+    const runParams: IRunParameters = {
+      patterns: [join(config.inputDir, '*.*')],
+      outputDir: '',
+      outputExtensions: ['gz', 'br']
+    };
+
+    await gzip(runParams);
+
+    let isFileExist = await FileUtils.isExist(`${config.generatedFilePath}.gz`);
+    expect(isFileExist).toBe(true);
+
+    isFileExist = await FileUtils.isExist(`${config.generatedFilePath}.br`);
+    expect(isFileExist).toBe(true);
+  });
+
+  test('Check if gzip file is created in a custom folder', async () => {
+    const runParams: IRunParameters = {
+      patterns: [join(config.inputDir, '*.*')],
+      outputDir: config.outputDir,
+      outputExtensions: ['gz']
+    };
+
+    await gzip(runParams);
+    const isFileExist = await FileUtils.isExist(join(config.outputDir, `${config.generatedFile}.gz`));
+
+    expect(isFileExist).toBe(true);
+  });
+});
diff --git a/test/cli.test.js b/test/cli.test.js
deleted file mode 100644
index 4a52c5f..0000000
--- a/test/cli.test.js
+++ /dev/null
@@ -1,48 +0,0 @@
-const path = require('path');
-const child_process = require('child_process');
-const FileUtils = require('./utils/fileUtils');
-const config = require('./config');
-
-describe('gzip files from CLI', () => {
-    beforeEach(() => {
-        return FileUtils.removeFolder(config.inputDir)
-            .then(() => FileUtils.removeFolder(config.outputDir))
-            .then(() => FileUtils.generateFile(config.generatedFilePath));
-    });
-
-    test('Check is gzip file created in the same folder', (done) => {
-        const outputFile = `${config.generatedFilePath}.gz`;
-        const command = `node src/index.js ${path.join(config.inputDir, '*.*')}`;
-
-        child_process.exec(command, {cwd: process.cwd()}, err => {
-            if (err) {
-                return;
-            }
-            FileUtils.isExist(outputFile).then(() => done());
-        });
-    });
-
-    test('Check is gzip file created in a custom folder', (done) => {
-        const outputFile = path.join(config.outputDir, `${config.generatedFile}.gz`);
-        const command = `node src/index.js ${path.join(config.inputDir, '*.*')} --output=${config.outputDir}`;
-
-        child_process.exec(command, {cwd: process.cwd()}, err => {
-            if (err) {
-                return;
-            }
-            FileUtils.isExist(outputFile).then(() => done());
-        });
-    });
-
-    test('Check error message is pattern not defined', (done) => {
-        const command = `node src/index.js`;
-
-        child_process.exec(command, {cwd: process.cwd()}, (err, stdout, stderr) => {
-            let isErrMsgOK = stderr === 'gzip: no one pattern is not specified. Operation is skipped.';
-
-            if (!err && isErrMsgOK) {
-                done();
-            }
-        });
-    });
-});
diff --git a/test/cli.test.ts b/test/cli.test.ts
new file mode 100644
index 0000000..968306c
--- /dev/null
+++ b/test/cli.test.ts
@@ -0,0 +1,71 @@
+import { join } from 'path';
+import { exec } from 'child_process';
+import FileUtils from './utils/fileUtils';
+import config from './config';
+
+describe('gzip files from CLI', () => {
+  beforeEach(async () => {
+    await FileUtils.removeFolder(config.inputDir);
+    await FileUtils.removeFolder(config.outputDir);
+    await FileUtils.generateFile(config.generatedFilePath);
+  });
+
+  test('Check if gzip file is created in the same folder', done => {
+    const command = `node dist/index.js ${join(config.inputDir, '*.*')}`;
+
+    exec(command, { cwd: process.cwd() }, async err => {
+      if (err) {
+        return;
+      }
+
+      const isFileExist = await FileUtils.isExist(`${config.generatedFilePath}.gz`);
+      expect(isFileExist).toBe(true);
+      done();
+    });
+  });
+
+  test('Check if gzip and brotli files are created in the same folder', done => {
+    const command = `node dist/index.js ${join(config.inputDir, '*.*')} --extension=br --extension=gz`;
+
+    exec(command, { cwd: process.cwd() }, async err => {
+      if (err) {
+        return;
+      }
+
+      let isFileExist = await FileUtils.isExist(`${config.generatedFilePath}.gz`);
+      expect(isFileExist).toBe(true);
+
+      isFileExist = await FileUtils.isExist(`${config.generatedFilePath}.br`);
+      expect(isFileExist).toBe(true);
+
+      done();
+    });
+  });
+
+  test('Check if gzip file is created in a custom folder', done => {
+    const command = `node dist/index.js ${join(config.inputDir, '*.*')} --output=${config.outputDir}`;
+
+    exec(command, { cwd: process.cwd() }, async err => {
+      if (err) {
+        return;
+      }
+
+      const isFileExist = await FileUtils.isExist(join(config.outputDir, `${config.generatedFile}.gz`));
+      expect(isFileExist).toBe(true);
+      done();
+    });
+  });
+
+  test('Check error message if pattern is not defined', done => {
+    const command = `node dist/index.js`;
+
+    exec(command, { cwd: process.cwd() }, (err, _stdout, stderr) => {
+      const isErrMsgOK = stderr.includes('gzip-cli: no one pattern is specified. Operation is skipped.');
+      if (!err && isErrMsgOK) {
+        done();
+      } else {
+        throw new Error();
+      }
+    });
+  });
+});
diff --git a/test/config.js b/test/config.js
deleted file mode 100644
index 95b3c94..0000000
--- a/test/config.js
+++ /dev/null
@@ -1,10 +0,0 @@
-const path = require('path');
-
-module.exports = {
-    inputDir: 'inputDir',
-    outputDir: 'outputDir',
-    generatedFile: 'source.js',
-    get generatedFilePath() {
-        return path.join(this.inputDir, this.generatedFile);
-    }
-};
diff --git a/test/config.ts b/test/config.ts
new file mode 100644
index 0000000..60f3ce8
--- /dev/null
+++ b/test/config.ts
@@ -0,0 +1,12 @@
+import { join } from 'path';
+
+const config = {
+  inputDir: 'inputDir',
+  outputDir: 'outputDir',
+  generatedFile: 'source.js',
+  get generatedFilePath() {
+    return join(this.inputDir, this.generatedFile);
+  }
+};
+
+export default config;
diff --git a/test/utils/fileUtils.js b/test/utils/fileUtils.js
deleted file mode 100644
index 56651bb..0000000
--- a/test/utils/fileUtils.js
+++ /dev/null
@@ -1,50 +0,0 @@
-const fs = require('fs');
-const path = require('path');
-const util = require('util');
-const rimraf = require('rimraf');
-
-module.exports = class FileUtils {
-    static isExist(filePath) {
-        const access = util.promisify(fs.access);
-        return access(filePath, fs.constants.F_OK);
-    }
-
-    static getWriteStream(filePath) {
-        FileUtils.ensureDir(path.dirname(filePath));
-        return fs.createWriteStream(filePath);
-    }
-
-    static generateFile(filePath, mbSize = 1) {
-        return new Promise((resolve, reject) => {
-            let writableStream = FileUtils.getWriteStream(filePath);
-
-            writableStream
-                .write(new Buffer(1024 * 1024 * mbSize), () => writableStream.end());
-
-            writableStream.on('finish', resolve);
-            writableStream.on('close', reject);
-        });
-    }
-
-    static ensureDir(dir) {
-        try {
-            fs.accessSync(dir, fs.constants.F_OK);
-        } catch (err) {
-            fs.mkdirSync(dir);
-        }
-    }
-
-    static removeFolder(dir) {
-        return new Promise((resolve, reject) => {
-            rimraf(dir, err => {
-                if (err) {
-                    reject(err);
-                    return;
-                }
-
-                resolve();
-            });
-        });
-    }
-
-};
diff --git a/test/utils/fileUtils.ts b/test/utils/fileUtils.ts
new file mode 100644
index 0000000..585ac96
--- /dev/null
+++ b/test/utils/fileUtils.ts
@@ -0,0 +1,50 @@
+import { access, accessSync, constants, createWriteStream, mkdirSync, WriteStream } from 'fs';
+import { dirname } from 'path';
+import { promisify } from 'util';
+import * as rimraf from 'rimraf';
+
+export default class FileUtils {
+  static isExist(filePath: string): Promise<boolean> {
+    return promisify(access)(filePath, constants.F_OK)
+      .then(() => true)
+      .catch(() => false);
+  }
+
+  static getWriteStream(filePath: string): WriteStream {
+    FileUtils.ensureDir(dirname(filePath));
+    return createWriteStream(filePath);
+  }
+
+  static generateFile(filePath: string, mbSize = 1): Promise<void> {
+    return new Promise((resolve, reject) => {
+      const writableStream = FileUtils.getWriteStream(filePath);
+
+      writableStream
+        .write(Buffer.alloc(1024 * 1024 * mbSize), () => writableStream.end());
+
+      writableStream.on('finish', resolve);
+      writableStream.on('close', reject);
+    });
+  }
+
+  static ensureDir(dir: string) {
+    try {
+      accessSync(dir, constants.F_OK);
+    } catch (err) {
+      mkdirSync(dir);
+    }
+  }
+
+  static removeFolder(dir: string): Promise<void> {
+    return new Promise((resolve, reject) => {
+      rimraf(dir, err => {
+        if (err) {
+          reject(err);
+          return;
+        }
+
+        resolve();
+      });
+    });
+  }
+};
diff --git a/tsconfig.app.json b/tsconfig.app.json
new file mode 100644
index 0000000..d5d84b2
--- /dev/null
+++ b/tsconfig.app.json
@@ -0,0 +1,12 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "declaration": true
+  },
+  "include": [
+    "src/**/*.ts"
+  ],
+  "exclude": [
+    "test/**"
+  ]
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..690e34d
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,66 @@
+{
+  "compilerOptions": {
+    /* Basic Options */
+    "incremental": true,                      /* Enable incremental compilation */
+    "target": "es2015",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./dist",                       /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    "tsBuildInfoFile": "./.tsbuildinfo",      /* Specify file to store incremental compilation information */
+    "removeComments": true,                   /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    "importHelpers": true,                    /* Import emit helpers from 'tslib'. */
+    "downlevelIteration": true,               /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    // "strict": true,                        /* Enable all strict type-checking options. */
+    "noImplicitAny": true,                    /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    "strictFunctionTypes": true,              /* Enable strict checking of function types. */
+    "strictBindCallApply": true,              /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    "alwaysStrict": true,                     /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    "noUnusedLocals": true,                   /* Report errors on unused locals. */
+    "noUnusedParameters": true,               /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    "moduleResolution": "node",               /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    // "esModuleInterop": true,               /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  }
+}
diff --git a/tsconfig.spec.json b/tsconfig.spec.json
new file mode 100644
index 0000000..6e1d6cf
--- /dev/null
+++ b/tsconfig.spec.json
@@ -0,0 +1,6 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist/spec"
+  }
+}
diff --git a/webpack.config.js b/webpack.config.js
new file mode 100644
index 0000000..07f5282
--- /dev/null
+++ b/webpack.config.js
@@ -0,0 +1,42 @@
+const webpack = require('webpack');
+const path = require('path');
+const nodeExternals = require('webpack-node-externals');
+
+module.exports = env => {
+  const isProductionBuild = env.NODE_ENV === 'production';
+
+  return {
+    target: 'node',
+    mode: env.NODE_ENV,
+    entry: './src/index.ts',
+    devtool: isProductionBuild ? undefined : 'source-map',
+    module: {
+      rules: [
+        {
+          test: /\.ts?$/,
+          use: [
+            {
+              loader: 'ts-loader',
+              options: {
+                configFile: 'tsconfig.app.json'
+              }
+            }
+          ],
+          exclude: /node_modules/
+        }
+      ]
+    },
+    resolve: {
+      extensions: ['.ts', '.js']
+    },
+    output: {
+      filename: 'index.js',
+      path: path.resolve(__dirname, 'dist'),
+      libraryTarget: 'commonjs'
+    },
+    externals: [nodeExternals()],
+    plugins: [
+      new webpack.BannerPlugin({ banner: '#!/usr/bin/env node', raw: true })
+    ]
+  };
+};