diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..6e7419f
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,29 @@
+{
+    "extends": [
+        "eslint:recommended",
+        "plugin:prettier/recommended"
+    ],
+    "plugins": [
+        "@typescript-eslint"
+    ],
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+        "sourceType": "module",
+        "project": "./tsconfig.json"
+    },
+    "env": {
+        "browser": false,
+        "node": true,
+        "es6": true
+    },
+    "globals": {},
+    "rules": {
+        "prettier/prettier": [
+            "error",
+            {
+              "singleQuote": true,
+              "trailingComma": "es5"
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index fa2fa5c..0aa93d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 es6/
 test/tiles
+.vscode
 
 # Logs
 logs
diff --git a/package-lock.json b/package-lock.json
index a099419..21158d4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,9 +1,41 @@
 {
   "name": "@watergis/mbtiles2pbf",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
+      "dev": true
+    },
+    "@babel/highlight": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.10.4",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+      "dev": true
+    },
     "@types/es6-promise": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/@types/es6-promise/-/es6-promise-3.3.0.tgz",
@@ -13,6 +45,12 @@
         "es6-promise": "*"
       }
     },
+    "@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/glob": {
       "version": "7.1.3",
       "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.3.tgz",
@@ -23,6 +61,12 @@
         "@types/node": "*"
       }
     },
+    "@types/json-schema": {
+      "version": "7.0.5",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.5.tgz",
+      "integrity": "sha512-7+2BITlgjgDhH0vvwZU/HZJVyk+2XUlvxXe8dFMedNX/aMkaOq++rMAFXc0tM7ij15QaWlbdQASBR9dihi+bDQ==",
+      "dev": true
+    },
     "@types/minimatch": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
@@ -45,6 +89,123 @@
         "@types/node": "*"
       }
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-3.6.1.tgz",
+      "integrity": "sha512-06lfjo76naNeOMDl+mWG9Fh/a0UHKLGhin+mGaIw72FUMbMGBkdi/FEJmgEDzh4eE73KIYzHWvOCYJ0ak7nrJQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "3.6.1",
+        "debug": "^4.1.1",
+        "functional-red-black-tree": "^1.0.1",
+        "regexpp": "^3.0.0",
+        "semver": "^7.3.2",
+        "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"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-3.6.1.tgz",
+      "integrity": "sha512-oS+hihzQE5M84ewXrTlVx7eTgc52eu+sVmG7ayLfOhyZmJ8Unvf3osyFQNADHP26yoThFfbxcibbO0d2FjnYhg==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/types": "3.6.1",
+        "@typescript-eslint/typescript-estree": "3.6.1",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0"
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-3.6.1.tgz",
+      "integrity": "sha512-SLihQU8RMe77YJ/jGTqOt0lMq7k3hlPVfp7v/cxMnXA9T0bQYoMDfTsNgHXpwSJM1Iq2aAJ8WqekxUwGv5F67Q==",
+      "dev": true,
+      "requires": {
+        "@types/eslint-visitor-keys": "^1.0.0",
+        "@typescript-eslint/experimental-utils": "3.6.1",
+        "@typescript-eslint/types": "3.6.1",
+        "@typescript-eslint/typescript-estree": "3.6.1",
+        "eslint-visitor-keys": "^1.1.0"
+      }
+    },
+    "@typescript-eslint/types": {
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-3.6.1.tgz",
+      "integrity": "sha512-NPxd5yXG63gx57WDTW1rp0cF3XlNuuFFB5G+Kc48zZ+51ZnQn9yjDEsjTPQ+aWM+V+Z0I4kuTFKjKvgcT1F7xQ==",
+      "dev": true
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-3.6.1.tgz",
+      "integrity": "sha512-G4XRe/ZbCZkL1fy09DPN3U0mR6SayIv1zSeBNquRFRk7CnVLgkC2ZPj8llEMJg5Y8dJ3T76SvTGtceytniaztQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "3.6.1",
+        "@typescript-eslint/visitor-keys": "3.6.1",
+        "debug": "^4.1.1",
+        "glob": "^7.1.6",
+        "is-glob": "^4.0.1",
+        "lodash": "^4.17.15",
+        "semver": "^7.3.2",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
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+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/visitor-keys": {
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-3.6.1.tgz",
+      "integrity": "sha512-qC8Olwz5ZyMTZrh4Wl3K4U6tfms0R/mzU4/5W3XeUZptVraGVmbptJbn6h2Ey6Rb3hOs3zWoAUebZk8t47KGiQ==",
+      "dev": true,
+      "requires": {
+        "eslint-visitor-keys": "^1.1.0"
+      }
+    },
+    "acorn": {
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
+      "integrity": "sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
+      "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.12.3",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.3.tgz",
+      "integrity": "sha512-4K0cK3L1hsqk9xIb2z9vs/XU+PGJZ9PNpJRDS9YLzmNdX6jmVPfamLvTJr0aDAusnHyCHO6MjzlkAsgtqp9teA==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
     "ansi-colors": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
@@ -103,6 +264,12 @@
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       "dev": true
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
+    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -138,6 +305,12 @@
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       "dev": true
     },
+    "callsites": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
+      "dev": true
+    },
     "camelcase": {
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
@@ -266,6 +439,17 @@
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
     },
+    "cross-spawn": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
+      "integrity": "sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==",
+      "dev": true,
+      "requires": {
+        "path-key": "^3.1.0",
+        "shebang-command": "^2.0.0",
+        "which": "^2.0.1"
+      }
+    },
     "debug": {
       "version": "3.2.6",
       "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
@@ -290,6 +474,12 @@
         "type-detect": "^4.0.0"
       }
     },
+    "deep-is": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
+      "dev": true
+    },
     "define-properties": {
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       "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
@@ -305,12 +495,30 @@
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       "dev": true
     },
+    "doctrine": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
+      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2"
+      }
+    },
     "emoji-regex": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
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       "dev": true
     },
+    "enquirer": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/enquirer/-/enquirer-2.3.6.tgz",
+      "integrity": "sha512-yjNnPr315/FjS4zIsUxYguYUPP2e1NK4d7E7ZOLiyYCcbFBiTMyID+2wvm2w6+pZ/odMA7cRkjhsPbltwBOrLg==",
+      "dev": true,
+      "requires": {
+        "ansi-colors": "^4.1.1"
+      }
+    },
     "es-abstract": {
       "version": "1.17.6",
       "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.6.tgz",
@@ -374,12 +582,248 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
       "dev": true
     },
+    "eslint": {
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.4.0.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "ajv": "^6.10.0",
+        "chalk": "^4.0.0",
+        "cross-spawn": "^7.0.2",
+        "debug": "^4.0.1",
+        "doctrine": "^3.0.0",
+        "enquirer": "^2.3.5",
+        "eslint-scope": "^5.1.0",
+        "eslint-utils": "^2.0.0",
+        "eslint-visitor-keys": "^1.2.0",
+        "espree": "^7.1.0",
+        "esquery": "^1.2.0",
+        "esutils": "^2.0.2",
+        "file-entry-cache": "^5.0.1",
+        "functional-red-black-tree": "^1.0.1",
+        "glob-parent": "^5.0.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.0.0",
+        "imurmurhash": "^0.1.4",
+        "is-glob": "^4.0.0",
+        "js-yaml": "^3.13.1",
+        "json-stable-stringify-without-jsonify": "^1.0.1",
+        "levn": "^0.4.1",
+        "lodash": "^4.17.14",
+        "minimatch": "^3.0.4",
+        "natural-compare": "^1.4.0",
+        "optionator": "^0.9.1",
+        "progress": "^2.0.0",
+        "regexpp": "^3.1.0",
+        "semver": "^7.2.1",
+        "strip-ansi": "^6.0.0",
+        "strip-json-comments": "^3.1.0",
+        "table": "^5.2.3",
+        "text-table": "^0.2.0",
+        "v8-compile-cache": "^2.0.3"
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+      "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
+      "integrity": "sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==",
+      "dev": true
+    },
     "promise.allsettled": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/promise.allsettled/-/promise.allsettled-1.0.2.tgz",
@@ -829,6 +1449,12 @@
         "iterate-value": "^1.0.0"
       }
     },
+    "punycode": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
+      "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+      "dev": true
+    },
     "readdirp": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.3.0.tgz",
@@ -838,6 +1464,12 @@
         "picomatch": "^2.0.7"
       }
     },
+    "regexpp": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.1.0.tgz",
+      "integrity": "sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==",
+      "dev": true
+    },
     "require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -850,6 +1482,12 @@
       "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
       "dev": true
     },
+    "resolve-from": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
+      "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==",
+      "dev": true
+    },
     "rimraf": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
@@ -858,6 +1496,12 @@
         "glob": "^7.1.3"
       }
     },
+    "semver": {
+      "version": "7.3.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
+      "integrity": "sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==",
+      "dev": true
+    },
     "serialize-javascript": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-3.0.0.tgz",
@@ -870,6 +1514,32 @@
       "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
       "dev": true
     },
+    "shebang-command": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+      "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+      "dev": true,
+      "requires": {
+        "shebang-regex": "^3.0.0"
+      }
+    },
+    "shebang-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+      "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+      "dev": true
+    },
+    "slice-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-2.1.0.tgz",
+      "integrity": "sha512-Qu+VC3EwYLldKa1fCxuuvULvSJOKEgk9pi8dZeCVK7TqBfUNTH4sFkk4joj8afVSfAYgJoSOetjx9QWOJ5mYoQ==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^3.2.0",
+        "astral-regex": "^1.0.0",
+        "is-fullwidth-code-point": "^2.0.0"
+      }
+    },
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -938,6 +1608,52 @@
         }
       }
     },
+    "table": {
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
+        "slice-ansi": "^2.1.0",
+        "string-width": "^3.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "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"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -947,18 +1663,57 @@
         "is-number": "^7.0.0"
       }
     },
+    "tslib": {
+      "version": "1.13.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
+      "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
+      "dev": true
+    },
+    "tsutils": {
+      "version": "3.17.1",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.17.1.tgz",
+      "integrity": "sha512-kzeQ5B8H3w60nFY2g8cJIuH7JDpsALXySGtwGJ0p2LSjLgay3NdIpqq5SoOBe46bKDW2iq25irHCr8wjomUS2g==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
+    },
+    "type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "^1.2.1"
+      }
+    },
     "type-detect": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
       "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true
     },
+    "type-fest": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+      "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
+      "dev": true
+    },
     "typescript": {
       "version": "3.9.7",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz",
       "integrity": "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==",
       "dev": true
     },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "util": {
       "version": "0.10.4",
       "resolved": "https://registry.npmjs.org/util/-/util-0.10.4.tgz",
@@ -967,6 +1722,12 @@
         "inherits": "2.0.3"
       }
     },
+    "v8-compile-cache": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.1.tgz",
+      "integrity": "sha512-8OQ9CL+VWyt3JStj7HX7/ciTL2V3Rl1Wf5OL+SNTm0yK1KvtReVulksyeRnCANHHuUxHlQig+JJDlUhBt1NQDQ==",
+      "dev": true
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -991,6 +1752,12 @@
         "string-width": "^1.0.2 || 2"
       }
     },
+    "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
+    },
     "workerpool": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.0.0.tgz",
@@ -1041,6 +1808,15 @@
       "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"
+      }
+    },
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
diff --git a/package.json b/package.json
index fdc818d..06ca856 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@watergis/mbtiles2pbf",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "This module will extract pbf files from mbtile by using mbutil.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -16,7 +16,8 @@
     "test": "npx mocha",
     "build": "npm run build:cjs && npm run build:esm",
     "build:cjs": "tsc --project . --module commonjs --outDir ./dist",
-    "build:esm": "tsc --project . --module es2015 --outDir ./es6"
+    "build:esm": "tsc --project . --module es2015 --outDir ./es6",
+    "precommit": "eslint --fix 'src/**/*.ts' && git add ."
   },
   "repository": {
     "type": "git",
@@ -32,8 +33,14 @@
     "@types/es6-promise": "^3.3.0",
     "@types/node": "^14.0.23",
     "@types/rimraf": "^3.0.0",
+    "@typescript-eslint/eslint-plugin": "^3.6.1",
+    "@typescript-eslint/parser": "^3.6.1",
     "chai": "^4.2.0",
+    "eslint": "^7.4.0",
+    "eslint-config-prettier": "^6.11.0",
+    "eslint-plugin-prettier": "^3.1.4",
     "mocha": "^8.0.1",
+    "prettier": "^2.0.5",
     "typescript": "^3.9.6"
   },
   "dependencies": {
diff --git a/src/index.ts b/src/index.ts
index ea1a135..e17258e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,2 +1,2 @@
-export {default as Mbtiles2Pbf} from './mbtiles2pbf'
-export {FileExtension} from './mbtiles2pbf'
\ No newline at end of file
+export { default as Mbtiles2Pbf } from './mbtiles2pbf';
+export { FileExtension } from './mbtiles2pbf';
diff --git a/src/mbtiles2pbf.ts b/src/mbtiles2pbf.ts
index 0f6e035..2766b16 100644
--- a/src/mbtiles2pbf.ts
+++ b/src/mbtiles2pbf.ts
@@ -1,95 +1,124 @@
-import {execSync} from 'child_process'
-import fs from 'fs'
-import path from 'path'
-import zlib from 'zlib'
-import rimraf from 'rimraf'
+import { execSync } from 'child_process';
+import fs from 'fs';
+import path from 'path';
+import zlib from 'zlib';
+import rimraf from 'rimraf';
 
-export enum FileExtension{
-    PBF = '.pbf',
-    MVT = '.mvt'
-}
+export const FileExtension = {
+  PBF: '.pbf',
+  MVT: '.mvt',
+} as const;
+type FileExtension = typeof FileExtension[keyof typeof FileExtension];
 
-class mbtiles2pbf{
-    private src: string
-    private dist: string
-    private ext: FileExtension
+class mbtiles2pbf {
+  private src: string;
+  private dist: string;
+  private ext: FileExtension;
 
-    /**
-     * Constructor
-     * @param src string file path of mbtiles
-     * @param dist string directory path for pbf vector tiles
-     * @param ext string Extension for vectortiles. Default is ".pbf".
-     */
-    constructor(src:string, dist:string, ext?: FileExtension){
-        this.src = src
-        this.dist = dist
-        this.ext = (ext)?ext:FileExtension.PBF
-    }
+  /**
+   * Constructor
+   * @param src string file path of mbtiles
+   * @param dist string directory path for pbf vector tiles
+   * @param ext string Extension for vectortiles. Default is ".pbf".
+   */
+  constructor(src: string, dist: string, ext?: FileExtension) {
+    this.src = src;
+    this.dist = dist;
+    this.ext = ext ? ext : FileExtension.PBF;
+  }
 
-    run(){
-        return new Promise<number>((resolve: (value?:number) => void, reject: (reason?: any) => void) =>{
-            this.extract()
-            .then((dist:string) =>{return this.getFiles(dist)})
-            .then((files:string[]) => {return this.gunzip(files)})
-            .then((no_files:number)=>{
-                console.log(`${no_files} tiles were unzipped.`)
-                resolve(no_files)
-            })
-            .catch(err=> {reject(err)});
-        })
-    }
+  run() {
+    return new Promise<number>(
+      (resolve: (value?: number) => void, reject: (reason?: any) => void) => {
+        this.extract()
+          .then((dist: string) => {
+            return this.getFiles(dist);
+          })
+          .then((files: string[]) => {
+            return this.gunzip(files);
+          })
+          .then((no_files: number) => {
+            console.log(`${no_files} tiles were unzipped.`);
+            resolve(no_files);
+          })
+          .catch((err) => {
+            reject(err);
+          });
+      }
+    );
+  }
 
-    extract(){
-        return new Promise<string>((resolve: (value?:string) => void, reject: (reason?: any) => void) =>{
-            if (fs.existsSync(this.dist)){
-                rimraf.sync(this.dist)
-            }
-            execSync(`mb-util ${this.src} ${this.dist} --scheme=xyz --image_format=pbf --silent`)
-            console.log(`pbf files were extracted under ${this.dist}.`)
-            resolve(this.dist)
-        })
-    }
+  extract() {
+    return new Promise<string>(
+      (resolve: (value?: string) => void, reject: (reason?: any) => void) => {
+        try {
+          if (fs.existsSync(this.dist)) {
+            rimraf.sync(this.dist);
+          }
+          execSync(
+            `mb-util ${this.src} ${this.dist} --scheme=xyz --image_format=pbf --silent`
+          );
+          console.log(`pbf files were extracted under ${this.dist}.`);
+          resolve(this.dist);
+        } catch (err) {
+          reject(err);
+        }
+      }
+    );
+  }
 
-    getFiles(dir: string){
-        return new Promise<string[]>((resolve: (value?:string[]) => void, reject: (reason?: any) => void) =>{
-            let files: string[] = [];
-            const dirents = fs.readdirSync(dir, {withFileTypes: true})
-            dirents.forEach(dirent=>{
-                const fp = path.join(dir, dirent.name)
-                if (dirent.isDirectory()) {
-                    this.getFiles(fp).then((_files:string[])=>{
-                        _files.forEach((f:string)=>{
-                            files.push(f)
-                        })
-                    });
-                } else {
-                    files.push(fp)
-                }
-            })
-            resolve(files);
-        });
-    }
+  getFiles(dir: string) {
+    return new Promise<string[]>(
+      (resolve: (value?: string[]) => void, reject: (reason?: any) => void) => {
+        try {
+          let files: string[] = [];
+          const dirents = fs.readdirSync(dir, { withFileTypes: true });
+          dirents.forEach((dirent) => {
+            const fp = path.join(dir, dirent.name);
+            if (dirent.isDirectory()) {
+              this.getFiles(fp).then((_files: string[]) => {
+                _files.forEach((f: string) => {
+                  files.push(f);
+                });
+              });
+            } else {
+              files.push(fp);
+            }
+          });
+          resolve(files);
+        } catch (err) {
+          reject(err);
+        }
+      }
+    );
+  }
 
-    gunzip(files:string[]){
-        return new Promise<number>((resolve: (value?:number) => void, reject: (reason?: any) => void) =>{
-            files.forEach((f:string)=>{
-                var gzipContent = fs.readFileSync(f)
-                var ext = path.extname(f)
-                if (ext !== FileExtension.PBF){
-                    return
-                }
-                const binary = zlib.gunzipSync(gzipContent)
-                let f2 = f
-                if (this.ext !== FileExtension.PBF){
-                    f2 = f.replace(FileExtension.PBF, this.ext)
-                }
-                fs.writeFileSync(f2, binary)
-                fs.unlinkSync(f)
-                console.log(f2)
-            })
-            resolve(files.length)
-        });
-    }
+  gunzip(files: string[]) {
+    return new Promise<number>(
+      (resolve: (value?: number) => void, reject: (reason?: any) => void) => {
+        try {
+          files.forEach((f: string) => {
+            var gzipContent = fs.readFileSync(f);
+            var ext = path.extname(f);
+            if (ext !== FileExtension.PBF) {
+              return;
+            }
+            const binary = zlib.gunzipSync(gzipContent);
+            let f2 = f;
+            if (this.ext !== FileExtension.PBF) {
+              f2 = f.replace(FileExtension.PBF, this.ext);
+            }
+            fs.writeFileSync(f2, binary);
+            fs.unlinkSync(f);
+            console.log(f2);
+          });
+          resolve(files.length);
+        } catch (err) {
+          reject(err);
+        }
+      }
+    );
+  }
 }
 
-export default mbtiles2pbf
\ No newline at end of file
+export default mbtiles2pbf;