diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..8db5883
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,16 @@
+{
+    "root": true,
+    "parser": "@typescript-eslint/parser",
+    "plugins": [
+        "@typescript-eslint"
+    ],
+    "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/eslint-recommended",
+        "plugin:@typescript-eslint/recommended"
+    ],
+    "rules": {
+        "quotes": ["error", "double"],
+        "indent": ["error", 4]
+    }
+}
diff --git a/.npmignore b/.npmignore
index 8e6e23f..6d97c2d 100644
--- a/.npmignore
+++ b/.npmignore
@@ -3,6 +3,7 @@ node_modules/
 .editorconfig
 .gitattributes
 .gitignore
+.eslintrc.json
 index.test.js
 src/
 tsconfig.json
diff --git a/package-lock.json b/package-lock.json
index 56f1f38..04cf67e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -412,6 +412,35 @@
         "minimist": "^1.2.0"
       }
     },
+    "@eslint/eslintrc": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.3.0.tgz",
+      "integrity": "sha512-1JTKgrOKAHVivSvOYw+sJOunkBjUOvjqWk1DPja7ZFhIS2mX/4EgTT8M7eTK9jrKhL/FvXXEbQwIs3pg1xp3dg==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "lodash": "^4.17.20",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        }
+      }
+    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -623,6 +652,32 @@
         "chalk": "^4.0.0"
       }
     },
+    "@nodelib/fs.scandir": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.4.tgz",
+      "integrity": "sha512-33g3pMJk3bg5nXbL/+CY6I2eJDzZAni49PfJnL5fghPTggPvBd/pFNSgJsdAgWptuFu7qq/ERvOYFlhvsLTCKA==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.stat": "2.0.4",
+        "run-parallel": "^1.1.9"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.4.tgz",
+      "integrity": "sha512-IYlHJA0clt2+Vg7bccq+TzRdJvv19c2INqBSsoOLp1je7xjtr7J26+WXR72MCdvU9q1qTzIWDfhMf+DRvQJK4Q==",
+      "dev": true
+    },
+    "@nodelib/fs.walk": {
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.6.tgz",
+      "integrity": "sha512-8Broas6vTtW4GIXTAHDoE32hnN2M5ykgCpWGbuXHQ15vEMqr23pB76e/GZcYsZCHALv50ktd24qhEyKr6wBtow==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.scandir": "2.1.4",
+        "fastq": "^1.6.0"
+      }
+    },
     "@sinonjs/commons": {
       "version": "1.8.1",
       "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.1.tgz",
@@ -715,6 +770,12 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "@types/json-schema": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.6.tgz",
+      "integrity": "sha512-3c+yGKvVP5Y9TYBEibGNR+kLtijnj7mYrXRg+WpFb2X9xm04g/DXYkfg4hmzJQosc9snFNUPkbYIhu+KAm6jJw==",
+      "dev": true
+    },
     "@types/node": {
       "version": "14.14.20",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.20.tgz",
@@ -754,6 +815,112 @@
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       "dev": true
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.13.0.tgz",
+      "integrity": "sha512-ygqDUm+BUPvrr0jrXqoteMqmIaZ/bixYOc3A4BRwzEPTZPi6E+n44rzNZWaB0YvtukgP+aoj0i/fyx7FkM2p1w==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "4.13.0",
+        "@typescript-eslint/scope-manager": "4.13.0",
+        "debug": "^4.1.1",
+        "functional-red-black-tree": "^1.0.1",
+        "lodash": "^4.17.15",
+        "regexpp": "^3.0.0",
+        "semver": "^7.3.2",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "7.3.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
+          "integrity": "sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.13.0.tgz",
+      "integrity": "sha512-/ZsuWmqagOzNkx30VWYV3MNB/Re/CGv/7EzlqZo5RegBN8tMuPaBgNK6vPBCQA8tcYrbsrTdbx3ixMRRKEEGVw==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/scope-manager": "4.13.0",
+        "@typescript-eslint/types": "4.13.0",
+        "@typescript-eslint/typescript-estree": "4.13.0",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0"
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-4.13.0.tgz",
+      "integrity": "sha512-KO0J5SRF08pMXzq9+abyHnaGQgUJZ3Z3ax+pmqz9vl81JxmTTOUfQmq7/4awVfq09b6C4owNlOgOwp61pYRBSg==",
+      "dev": true,
+      "requires": {
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+        "@typescript-eslint/types": "4.13.0",
+        "@typescript-eslint/typescript-estree": "4.13.0",
+        "debug": "^4.1.1"
+      }
+    },
+    "@typescript-eslint/scope-manager": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.13.0.tgz",
+      "integrity": "sha512-UpK7YLG2JlTp/9G4CHe7GxOwd93RBf3aHO5L+pfjIrhtBvZjHKbMhBXTIQNkbz7HZ9XOe++yKrXutYm5KmjWgQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.13.0",
+        "@typescript-eslint/visitor-keys": "4.13.0"
+      }
+    },
+    "@typescript-eslint/types": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.13.0.tgz",
+      "integrity": "sha512-/+aPaq163oX+ObOG00M0t9tKkOgdv9lq0IQv/y4SqGkAXmhFmCfgsELV7kOCTb2vVU5VOmVwXBXJTDr353C1rQ==",
+      "dev": true
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.13.0.tgz",
+      "integrity": "sha512-9A0/DFZZLlGXn5XA349dWQFwPZxcyYyCFX5X88nWs2uachRDwGeyPz46oTsm9ZJE66EALvEns1lvBwa4d9QxMg==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.13.0",
+        "@typescript-eslint/visitor-keys": "4.13.0",
+        "debug": "^4.1.1",
+        "globby": "^11.0.1",
+        "is-glob": "^4.0.1",
+        "lodash": "^4.17.15",
+        "semver": "^7.3.2",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "7.3.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
+          "integrity": "sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/visitor-keys": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.13.0.tgz",
+      "integrity": "sha512-6RoxWK05PAibukE7jElqAtNMq+RWZyqJ6Q/GdIxaiUj2Ept8jh8+FUVlbq9WxMYxkmEOPvCE5cRSyupMpwW31g==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.13.0",
+        "eslint-visitor-keys": "^2.0.0"
+      }
+    },
     "abab": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.5.tgz",
@@ -776,6 +943,12 @@
         "acorn-walk": "^7.1.1"
       }
     },
+    "acorn-jsx": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
+      "integrity": "sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==",
+      "dev": true
+    },
     "acorn-walk": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
@@ -794,6 +967,12 @@
         "uri-js": "^4.2.2"
       }
     },
+    "ansi-colors": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+      "dev": true
+    },
     "ansi-escapes": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
@@ -863,6 +1042,12 @@
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
       "dev": true
     },
+    "array-union": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
+      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==",
+      "dev": true
+    },
     "array-unique": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
@@ -890,6 +1075,12 @@
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       "dev": true
     },
+    "astral-regex": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-2.0.0.tgz",
+      "integrity": "sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==",
+      "dev": true
+    },
     "asynckit": {
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       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -1434,6 +1625,24 @@
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       "dev": true
     },
+    "dir-glob": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-3.0.1.tgz",
+      "integrity": "sha512-WkrWp9GR4KXfKGYzOLmTuGVi1UWFfws377n9cc55/tb6DuqyF6pcQ5AbiHEshaDpY9v6oaSr2XCDidGmMwdzIA==",
+      "dev": true,
+      "requires": {
+        "path-type": "^4.0.0"
+      }
+    },
+    "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"
+      }
+    },
     "domexception": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/domexception/-/domexception-2.0.1.tgz",
@@ -1482,6 +1691,15 @@
         "once": "^1.4.0"
       }
     },
+    "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"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
@@ -1510,12 +1728,243 @@
         "source-map": "~0.6.1"
       }
     },
+    "eslint": {
+      "version": "7.18.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.18.0.tgz",
+      "integrity": "sha512-fbgTiE8BfUJZuBeq2Yi7J3RB3WGUQ9PNuNbmgi6jt9Iv8qrkxfy19Ds3OpL1Pm7zg3BtTVhvcUZbIRQ0wmSjAQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@eslint/eslintrc": "^0.3.0",
+        "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": "^5.1.1",
+        "eslint-utils": "^2.1.0",
+        "eslint-visitor-keys": "^2.0.0",
+        "espree": "^7.3.1",
+        "esquery": "^1.2.0",
+        "esutils": "^2.0.2",
+        "file-entry-cache": "^6.0.0",
+        "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": "^4.17.20",
+        "minimatch": "^3.0.4",
+        "natural-compare": "^1.4.0",
+        "optionator": "^0.9.1",
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+        "regexpp": "^3.1.0",
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+        "table": "^6.0.4",
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+      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-4.0.0.tgz",
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+        "astral-regex": "^2.0.0",
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+    "strip-json-comments": {
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+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
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+      "resolved": "https://registry.npmjs.org/table/-/table-6.0.7.tgz",
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+      "requires": {
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+        "lodash": "^4.17.20",
+        "slice-ansi": "^4.0.0",
+        "string-width": "^4.2.0"
+      },
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+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-7.0.3.tgz",
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+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "json-schema-traverse": "^1.0.0",
+            "require-from-string": "^2.0.2",
+            "uri-js": "^4.2.2"
+          }
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+        "json-schema-traverse": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
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+        }
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     "terminal-link": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/terminal-link/-/terminal-link-2.1.1.tgz",
@@ -4317,6 +4996,12 @@
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       }
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+    "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
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@@ -4396,6 +5081,21 @@
         "punycode": "^2.1.1"
       }
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+    "tslib": {
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+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
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+      "dev": true
+    },
+    "tsutils": {
+      "version": "3.19.1",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.19.1.tgz",
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+      "dev": true,
+      "requires": {
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@@ -4527,6 +5227,12 @@
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+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.2.0.tgz",
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diff --git a/package.json b/package.json
index 4b9a8c6..fafbd00 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,9 @@
   "description": "Implementation of setTimeout and setInterval with pause",
   "main": "dist/index.js",
   "scripts": {
-    "test": "jest"
+    "test": "jest",
+    "lint": "eslint . --ext .ts",
+    "build": "tsc"
   },
   "repository": {
     "type": "git",
@@ -22,6 +24,9 @@
     "interval"
   ],
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+    "@typescript-eslint/eslint-plugin": "^4.13.0",
+    "@typescript-eslint/parser": "^4.13.0",
+    "eslint": "^7.18.0",
     "jest": "^26.6.3",
     "typescript": "^4.1.3"
   }