diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..515a483
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,23 @@
+module.exports = {
+  env: {
+    es6: true,
+    node: true,
+  },
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:prettier/recommended',
+  ],
+  globals: {
+    Atomics: 'readonly',
+    SharedArrayBuffer: 'readonly',
+  },
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 11,
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint'],
+  rules: {},
+};
diff --git a/.github/workflows/node.yml b/.github/workflows/node.yml
new file mode 100644
index 0000000..63f9bd8
--- /dev/null
+++ b/.github/workflows/node.yml
@@ -0,0 +1,23 @@
+name: Node.js
+
+on:
+  - push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - run: npm ci
+      - run: npm run lint
diff --git a/.prettierrc.js b/.prettierrc.js
new file mode 100644
index 0000000..f1284c6
--- /dev/null
+++ b/.prettierrc.js
@@ -0,0 +1,6 @@
+module.exports = {
+  trailingComma: 'es5',
+  tabWidth: 2,
+  semi: true,
+  singleQuote: true,
+};
diff --git a/package-lock.json b/package-lock.json
index 3f6e08a..f7274c6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,32 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.1.tgz",
+      "integrity": "sha512-IGhtTmpjGbYzcEDOw7DcQtbQSXcG9ftmAXtWTu9V936vDye4xjjekktFAtgZsWpzTj/X01jocB46mTywm/4SZw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.1"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.1.tgz",
+      "integrity": "sha512-5vW/JXLALhczRCWP0PnFDMCJAchlBvM7f4uk/jXritBnIa6E1KmqmtrS3yn1LAnxFBypQ3eneLuXjsnfQsgILw==",
+      "dev": true
+    },
+    "@babel/highlight": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.1.tgz",
+      "integrity": "sha512-8rMof+gVP8mxYZApLF/JgNDAkdKa+aJt3ZYxF8z6+j/hpeXL7iMsKCPHa2jNMHu/qqBwzQF4OHNoYi8dMA/rYg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.10.1",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      }
+    },
     "@babel/parser": {
       "version": "7.9.6",
       "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.9.6.tgz",
@@ -51,6 +77,18 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
+    "@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/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/node": {
       "version": "14.0.4",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-14.0.4.tgz",
@@ -94,6 +132,86 @@
         "@types/node": "*"
       }
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-3.1.0.tgz",
+      "integrity": "sha512-D52KwdgkjYc+fmTZKW7CZpH5ZBJREJKZXRrveMiRCmlzZ+Rw9wRVJ1JAmHQ9b/+Ehy1ZeaylofDB9wwXUt83wg==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "3.1.0",
+        "functional-red-black-tree": "^1.0.1",
+        "regexpp": "^3.0.0",
+        "semver": "^7.3.2",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "7.3.2",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
+          "integrity": "sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==",
+          "dev": true
+        }
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-3.1.0.tgz",
+      "integrity": "sha512-Zf8JVC2K1svqPIk1CB/ehCiWPaERJBBokbMfNTNRczCbQSlQXaXtO/7OfYz9wZaecNvdSvVADt6/XQuIxhC79w==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/typescript-estree": "3.1.0",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0"
+      },
+      "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": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-3.1.0.tgz",
+      "integrity": "sha512-NcDSJK8qTA2tPfyGiPes9HtVKLbksmuYjlgGAUs7Ld2K0swdWibnCq9IJx9kJN8JJdgUJSorFiGaPHBgH81F/Q==",
+      "dev": true,
+      "requires": {
+        "@types/eslint-visitor-keys": "^1.0.0",
+        "@typescript-eslint/experimental-utils": "3.1.0",
+        "@typescript-eslint/typescript-estree": "3.1.0",
+        "eslint-visitor-keys": "^1.1.0"
+      }
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-3.1.0.tgz",
+      "integrity": "sha512-+4nfYauqeQvK55PgFrmBWFVYb6IskLyOosYEmhH3mSVhfBp9AIJnjExdgDmKWoOBHRcPM8Ihfm2BFpZf0euUZQ==",
+      "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": "^7.3.2",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "7.3.2",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
+          "integrity": "sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==",
+          "dev": true
+        }
+      }
+    },
     "@webassemblyjs/ast": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.9.0.tgz",
@@ -287,6 +405,12 @@
       "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
       "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
+    },
     "agent-base": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-5.1.1.tgz",
@@ -317,6 +441,23 @@
       "integrity": "sha512-RO1ibKvd27e6FEShVFfPALuHI3WjSVNeK5FIsmme/LYRNxjKuNj+Dt7bucLa6NdSv3JcVTyMlm9kGR84z1XpaQ==",
       "dev": true
     },
+    "ansi-escapes": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
+      "integrity": "sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==",
+      "dev": true,
+      "requires": {
+        "type-fest": "^0.11.0"
+      },
+      "dependencies": {
+        "type-fest": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
+          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
+          "dev": true
+        }
+      }
+    },
     "ansi-regex": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
@@ -355,6 +496,15 @@
       "integrity": "sha512-58S9QDqG0Xx27YwPSt9fJxivjYl432YCwfDMfZ+71RAqUrZef7LrKQZ3LHLOwCS4FLNBplP533Zx895SeOCHvA==",
       "dev": true
     },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -452,6 +602,12 @@
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "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
+    },
     "async-each": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
@@ -861,6 +1017,12 @@
         "unset-value": "^1.0.0"
       }
     },
+    "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",
@@ -893,6 +1055,12 @@
         "supports-color": "^5.3.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
     "chokidar": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.4.0.tgz",
@@ -958,6 +1126,21 @@
         }
       }
     },
+    "cli-cursor": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^3.1.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.1.tgz",
+      "integrity": "sha512-GRMWDxpOB6Dgk2E5Uo+3eEBvtOOlimMmpbFiKuLFnQzYDavtLFY3K5ona41jgN/WdRZtG7utuVSVTL4HbZHGkw==",
+      "dev": true
+    },
     "cliui": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
@@ -1321,6 +1504,15 @@
         "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"
+      }
+    },
     "domain-browser": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/domain-browser/-/domain-browser-1.2.0.tgz",
@@ -1480,6 +1672,237 @@
         "source-map": "~0.6.1"
       }
     },
+    "eslint": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.1.0.tgz",
+      "integrity": "sha512-DfS3b8iHMK5z/YLSme8K5cge168I8j8o1uiVmFCgnnjxZQbCGyraF8bMl7Ju4yfBmCuxD7shOF7eqGkcuIHfsA==",
+      "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",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0",
+        "eslint-visitor-keys": "^1.1.0",
+        "espree": "^7.0.0",
+        "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",
+        "inquirer": "^7.0.0",
+        "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"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "dev": true
+        },
+        "ansi-styles": {
+          "version": "4.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
+          "integrity": "sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==",
+          "dev": true,
+          "requires": {
+            "@types/color-name": "^1.1.1",
+            "color-convert": "^2.0.1"
+          }
+        },
+        "chalk": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.0.0.tgz",
+          "integrity": "sha512-N9oWFcegS0sFr9oh1oz2d7Npos6vNoWW9HvtCg5N1KRFpUhaAhvTv5Y58g880fZaEYSNm3qDz8SU1UrGvp+n7A==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "dev": true,
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
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+          "dev": true
+        },
+        "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"
+          }
+        },
+        "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"
+          }
+        },
+        "has-flag": {
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+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
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+          "dev": true
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+        "string-width": {
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+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
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+          "dev": true,
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^5.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "7.1.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.1.0.tgz",
+          "integrity": "sha512-oRSIpR8pxT1Wr2FquTNnGet79b3BWljqOuoW/h4oBhxJ/HUbX5nX6JSruTkvXDCFMwDPvsaTTbvMLKZWSy0R5g==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^4.0.0"
+          }
+        }
+      }
+    },
     "interpret": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/interpret/-/interpret-1.2.0.tgz",
@@ -2642,6 +3338,22 @@
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       "dev": true
     },
+    "js-tokens": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
+      "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
+      "dev": true
+    },
+    "js-yaml": {
+      "version": "3.14.0",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.0.tgz",
+      "integrity": "sha512-/4IbIeHcD9VMHFqDR/gQ7EdZdLimOvW2DdcxFjdyyZ9NsbS+ccrXqVWDtab/lRl5AlUqmpBx8EhPaWR+OtY17A==",
+      "dev": true,
+      "requires": {
+        "argparse": "^1.0.7",
+        "esprima": "^4.0.0"
+      }
+    },
     "jsbn": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/jsbn/-/jsbn-0.1.1.tgz",
@@ -2666,6 +3378,12 @@
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       "dev": true
     },
+    "json-stable-stringify-without-jsonify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz",
+      "integrity": "sha1-nbe1lJatPzz+8wp1FC0tkwrXJlE=",
+      "dev": true
+    },
     "json-stringify-safe": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
@@ -2780,6 +3498,12 @@
         "path-exists": "^3.0.0"
       }
     },
+    "lodash": {
+      "version": "4.17.15",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
+      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
+      "dev": true
+    },
     "lru-cache": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-5.1.1.tgz",
@@ -3058,6 +3782,12 @@
         "readable-stream": "^2.0.5"
       }
     },
+    "mute-stream": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/mute-stream/-/mute-stream-0.0.8.tgz",
+      "integrity": "sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA==",
+      "dev": true
+    },
     "nanomatch": {
       "version": "1.2.13",
       "resolved": "https://registry.npmjs.org/nanomatch/-/nanomatch-1.2.13.tgz",
@@ -3077,6 +3807,12 @@
         "to-regex": "^3.0.1"
       }
     },
+    "natural-compare": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/natural-compare/-/natural-compare-1.4.0.tgz",
+      "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=",
+      "dev": true
+    },
     "neo-async": {
       "version": "2.6.1",
       "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.1.tgz",
@@ -3292,6 +4028,15 @@
         "wrappy": "1"
       }
     },
+    "onetime": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/onetime/-/onetime-5.1.0.tgz",
+      "integrity": "sha512-5NcSkPHhwTVFIQN+TUqXoS5+dlElHXdpAWu9I0HP20YOtIi+aZ0Ct82jdlILDxjLEAWwvm+qj1m6aEtsDVmm6Q==",
+      "dev": true,
+      "requires": {
+        "mimic-fn": "^2.1.0"
+      }
+    },
     "optionator": {
       "version": "0.8.3",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
@@ -3388,6 +4133,15 @@
         "readable-stream": "^2.1.5"
       }
     },
+    "parent-module": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
+      "integrity": "sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g==",
+      "dev": true,
+      "requires": {
+        "callsites": "^3.0.0"
+      }
+    },
     "parse-asn1": {
       "version": "5.1.5",
       "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.5.tgz",
@@ -3675,6 +4429,21 @@
       "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
       "dev": true
     },
+    "prettier": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.0.5.tgz",
+      "integrity": "sha512-7PtVymN48hGcO4fGjybyBSIWDsLU4H4XlvOHfq91pz9kkGlonzwTfYkaIEwiRg/dAJF9YlbsduBAgtYLi+8cFg==",
+      "dev": true
+    },
+    "prettier-linter-helpers": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/prettier-linter-helpers/-/prettier-linter-helpers-1.0.0.tgz",
+      "integrity": "sha512-GbK2cP9nraSSUF9N2XwUwqfzlAFlMNYYl+ShE/V+H8a9uNl/oUqB1w2EL54Jh0OlyRSd8RfWYJ3coVS4TROP2w==",
+      "dev": true,
+      "requires": {
+        "fast-diff": "^1.1.2"
+      }
+    },
     "process": {
       "version": "0.11.10",
       "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
@@ -3902,6 +4671,12 @@
         "safe-regex": "^1.1.0"
       }
     },
+    "regexpp": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.1.0.tgz",
+      "integrity": "sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==",
+      "dev": true
+    },
     "remove-trailing-separator": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
@@ -4023,6 +4798,16 @@
       "integrity": "sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=",
       "dev": true
     },
+    "restore-cursor": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-3.1.0.tgz",
+      "integrity": "sha512-l+sSefzHpj5qimhFSE5a8nufZYAM3sBSVMAPtYkmC+4EH2anSGaEMXSD0izRQbu9nfyQ9y5JrVmp7E8oZrUjvA==",
+      "dev": true,
+      "requires": {
+        "onetime": "^5.1.0",
+        "signal-exit": "^3.0.2"
+      }
+    },
     "ret": {
       "version": "0.1.15",
       "resolved": "https://registry.npmjs.org/ret/-/ret-0.1.15.tgz",
@@ -4054,6 +4839,12 @@
         "inherits": "^2.0.1"
       }
     },
+    "run-async": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
+      "integrity": "sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ==",
+      "dev": true
+    },
     "run-parallel": {
       "version": "1.1.9",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.1.9.tgz",
@@ -4069,6 +4860,15 @@
         "aproba": "^1.1.1"
       }
     },
+    "rxjs": {
+      "version": "6.5.5",
+      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.5.5.tgz",
+      "integrity": "sha512-WfQI+1gohdf0Dai/Bbmk5L5ItH5tYqm3ki2c5GdWhKjalzjg93N3avFjVStyZZz+A2Em+ZxKH5bNghw9UeylGQ==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.9.0"
+      }
+    },
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
@@ -4191,6 +4991,17 @@
       "integrity": "sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==",
       "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"
+      }
+    },
     "snapdragon": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/snapdragon/-/snapdragon-0.8.2.tgz",
@@ -4401,6 +5212,12 @@
         "extend-shallow": "^3.0.0"
       }
     },
+    "sprintf-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "dev": true
+    },
     "sshpk": {
       "version": "1.16.1",
       "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
@@ -4589,6 +5406,12 @@
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
+    "strip-json-comments": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.0.tgz",
+      "integrity": "sha512-e6/d0eBu7gHtdCqFt0xJr642LdToM5/cN4Qb9DbHjVx1CP5RyeM+zH7pbecEmDv/lBqb0QH+6Uqq75rxFPkM0w==",
+      "dev": true
+    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -4598,6 +5421,18 @@
         "has-flag": "^3.0.0"
       }
     },
+    "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"
+      }
+    },
     "tapable": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/tapable/-/tapable-1.1.3.tgz",
@@ -4670,6 +5505,12 @@
         "worker-farm": "^1.7.0"
       }
     },
+    "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
+    },
     "throttleit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/throttleit/-/throttleit-1.0.0.tgz",
@@ -4701,6 +5542,15 @@
         "setimmediate": "^1.0.4"
       }
     },
+    "tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.2"
+      }
+    },
     "to-arraybuffer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz",
@@ -4796,6 +5646,15 @@
       "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"
+      }
+    },
     "tty-browserify": {
       "version": "0.0.0",
       "resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.0.tgz",
@@ -4826,6 +5685,12 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "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
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -5593,6 +6458,15 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "ws": {
       "version": "7.3.0",
       "resolved": "https://registry.npmjs.org/ws/-/ws-7.3.0.tgz",
diff --git a/package.json b/package.json
index d95d8f4..40035b8 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
     "microsoft-teams"
   ],
   "scripts": {
+    "lint": "eslint src scripts",
     "build": "webpack",
     "start": "ts-node ./src/main.ts",
     "download": "ts-node ./scripts/download.ts 756035",
@@ -29,9 +30,15 @@
     "@types/node": "^14.0.4",
     "@types/puppeteer-core": "^2.0.0",
     "@types/unzipper": "^0.10.3",
+    "@typescript-eslint/eslint-plugin": "^3.1.0",
+    "@typescript-eslint/parser": "^3.1.0",
     "bufferutil": "^4.0.1",
+    "eslint": "^7.1.0",
+    "eslint-config-prettier": "^6.11.0",
+    "eslint-plugin-prettier": "^3.1.3",
     "npm-run-all": "^4.1.5",
     "pkg": "^4.4.8",
+    "prettier": "^2.0.5",
     "puppeteer-core": "^3.1.0",
     "ts-loader": "^7.0.4",
     "ts-node": "^8.10.1",
diff --git a/scripts/download.ts b/scripts/download.ts
index 6f9ca7e..0c1cce4 100644
--- a/scripts/download.ts
+++ b/scripts/download.ts
@@ -9,47 +9,50 @@ import { Target, targets } from './targets';
 const { mkdir, unlink } = promises;
 
 const revision = process.argv[2];
-const baseUrl = 'https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/';
-const getUrl = (target: Target) => resolve(
-  baseUrl,
-  `${target.prefix}%2F${revision}%2F${target.name}.zip?alt=media`,
-);
+const baseUrl =
+  'https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/';
+
+const getUrl = (target: Target) =>
+  resolve(
+    baseUrl,
+    `${target.prefix}%2F${revision}%2F${target.name}.zip?alt=media`
+  );
 
 const baseDirectory = join(process.cwd(), 'chromium');
-const getArchivePath = (target: Target) => join(baseDirectory, `${target.name}.zip`);
+const getArchivePath = (target: Target) =>
+  join(baseDirectory, `${target.name}.zip`);
 
-const download = (from: string, to: string) => new Promise<void>(resolve => {
-  const stream = createWriteStream(to);
+const download = (from: string, to: string) =>
+  new Promise<void>((resolve) => {
+    const stream = createWriteStream(to);
 
-  get(from, response => {
-    response.pipe(stream);
-    response.on('end', () => {
-      stream.end();
-      resolve();
+    get(from, (response) => {
+      response.pipe(stream);
+      response.on('end', () => {
+        stream.end();
+        resolve();
+      });
     });
   });
-});
 
-const unzip = (from: string, to: string) => new Promise((resolve, reject) => {
-  const stream = createReadStream(from);
-  const extract = Extract({ path: to });
+const unzip = (from: string, to: string) =>
+  new Promise((resolve, reject) => {
+    const stream = createReadStream(from);
+    const extract = Extract({ path: to });
 
-  extract.on('error', reject);
-  extract.once('close', resolve);
-  stream.pipe(extract);
-});
+    extract.on('error', reject);
+    extract.once('close', resolve);
+    stream.pipe(extract);
+  });
 
 (async () => {
-  await (
-    mkdir(baseDirectory, {
-      recursive: true,
-    })
-      .catch((error: NodeJS.ErrnoException) => {
-        if (error?.code !== 'EEXIST') {
-          throw error;
-        }
-      })
-  );
+  await mkdir(baseDirectory, {
+    recursive: true,
+  }).catch((error: NodeJS.ErrnoException) => {
+    if (error?.code !== 'EEXIST') {
+      throw error;
+    }
+  });
 
   for (const target of targets) {
     const source = getUrl(target);
@@ -61,5 +64,4 @@ const unzip = (from: string, to: string) => new Promise((resolve, reject) => {
     await unzip(archive, baseDirectory);
     await unlink(archive);
   }
-})()
-  .catch(console.error);
+})().catch(console.error);
diff --git a/scripts/package.ts b/scripts/package.ts
index 83c1d78..a672e93 100644
--- a/scripts/package.ts
+++ b/scripts/package.ts
@@ -10,14 +10,11 @@ const baseDirectory = join(__dirname, '..');
 const packages = join(baseDirectory, 'packages');
 
 (async () => {
-  await (
-    mkdir(packages)
-      .catch((error: NodeJS.ErrnoException) => {
-        if (error?.code !== 'EEXIST') {
-          throw error;
-        }
-      })
-  );
+  await mkdir(packages).catch((error: NodeJS.ErrnoException) => {
+    if (error?.code !== 'EEXIST') {
+      throw error;
+    }
+  });
 
   for (const target of targets) {
     const config = {
@@ -41,5 +38,4 @@ const packages = join(baseDirectory, 'packages');
 
     await unlink(path);
   }
-})()
-  .catch(console.error);
+})().catch(console.error);
diff --git a/src/main.ts b/src/main.ts
index a837e43..f32f1b6 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -9,7 +9,7 @@ import { ChromiumFinder } from './services/chromium/finder';
 const baseUrl = 'https://assignments.onenote.com/api/v1.0';
 
 (async () => {
-  const chromium = await (new ChromiumFinder(__dirname)).find();
+  const chromium = await new ChromiumFinder(__dirname).find();
   const resolver = new ChromiumResolver(chromium);
   const authorizer = new Authorizer(resolver);
   const tokenStorage = new FilesystemTokenStorage(process.cwd());
@@ -24,8 +24,7 @@ const baseUrl = 'https://assignments.onenote.com/api/v1.0';
       console.log('\t', a['isCompleted'] ? '✔' : '❗', a.displayName);
     }
   }
-})()
-  .catch((error) => {
-    console.error(error);
-    process.exit(1);
-  });
+})().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});
diff --git a/src/services/api/client.ts b/src/services/api/client.ts
index 8d2fc26..d8b8f47 100644
--- a/src/services/api/client.ts
+++ b/src/services/api/client.ts
@@ -3,24 +3,16 @@ import { Class } from '../../models/class';
 import { Assignment } from '../../models/assignment';
 
 export class ApiClient {
-
-  constructor(
-    private proxy: ApiProxy,
-  ) {
-  }
+  constructor(private proxy: ApiProxy) {}
 
   async getClasses(): Promise<Class[]> {
-    return await this.proxy.request(
-      'GET',
-      '/edu/me/classes',
-    );
+    return await this.proxy.request('GET', '/edu/me/classes');
   }
 
   async getAssignments(classId: string): Promise<Assignment[]> {
     return await this.proxy.request(
       'GET',
-      `/edu/classes/${classId}/assignments`,
+      `/edu/classes/${classId}/assignments`
     );
   }
-
 }
diff --git a/src/services/api/proxy.ts b/src/services/api/proxy.ts
index fcf710d..f1f20c3 100644
--- a/src/services/api/proxy.ts
+++ b/src/services/api/proxy.ts
@@ -3,26 +3,34 @@ import { request, RequestOptions } from 'https';
 
 import { ITokenProvider } from '../token/provider';
 
-export type Method = 'GET' | 'HEAD' | 'POST' | 'PUT' | 'DELETE' | 'CONNECT' | 'OPTIONS' | 'TRACE' | 'PATCH';
+export type Method =
+  | 'GET'
+  | 'HEAD'
+  | 'POST'
+  | 'PUT'
+  | 'DELETE'
+  | 'CONNECT'
+  | 'OPTIONS'
+  | 'TRACE'
+  | 'PATCH';
 
 export class ApiProxy {
+  constructor(private baseUrl: string, private tokenProvider: ITokenProvider) {}
 
-  constructor(
-    private baseUrl: string,
-    private tokenProvider: ITokenProvider,
-  ) {
-  }
-
-  public async request<T>(method: Method, path: string, refreshToken: boolean = false): Promise<T> {
+  public async request<T>(
+    method: Method,
+    path: string,
+    refreshToken = false
+  ): Promise<T> {
     const url = this.baseUrl + path;
-    const token = await (
-       refreshToken ? this.tokenProvider.refresh() : this.tokenProvider.get()
-    );
+    const token = await (refreshToken
+      ? this.tokenProvider.refresh()
+      : this.tokenProvider.get());
 
     const options: RequestOptions = {
       method,
       headers: {
-        'authorization': `Bearer ${token}`,
+        authorization: `Bearer ${token}`,
       },
     };
 
@@ -31,16 +39,14 @@ export class ApiProxy {
         let data = '';
 
         if (response.statusCode === 401) {
-          return resolve(
-            this.request(method, path, true)
-          );
+          return resolve(this.request(method, path, true));
         }
 
         if (response.statusCode !== 200) {
           return reject(response);
         }
 
-        response.on('data', chunk => data += chunk);
+        response.on('data', (chunk) => (data += chunk));
         response.on('end', () => {
           try {
             resolve(JSON.parse(data)['value'] as T);
@@ -50,10 +56,7 @@ export class ApiProxy {
         });
       };
 
-      request(url, options, callback)
-        .on('error', reject)
-        .end();
+      request(url, options, callback).on('error', reject).end();
     });
   }
-
 }
diff --git a/src/services/authorizer.ts b/src/services/authorizer.ts
index ed78185..a7e73de 100644
--- a/src/services/authorizer.ts
+++ b/src/services/authorizer.ts
@@ -6,11 +6,7 @@ import { ChromiumResolver } from './chromium/resolver';
 export type Token = string;
 
 export class Authorizer {
-
-  constructor(
-    private chromiumResolver: ChromiumResolver,
-  ) {
-  }
+  constructor(private chromiumResolver: ChromiumResolver) {}
 
   async authorize(): Promise<Token> {
     const browser = await launch({
@@ -19,20 +15,20 @@ export class Authorizer {
       args: [
         '--no-sandbox',
         '--window-size=800,600',
-        '--app=https://teams.microsoft.com/_#/apps/66aeee93-507d-479a-a3ef-8f494af43945/sections/classroom'
-      ]
+        '--app=https://teams.microsoft.com/_#/apps/66aeee93-507d-479a-a3ef-8f494af43945/sections/classroom',
+      ],
     });
 
     const pages = await browser.pages();
     const page = pages.length > 0 ? pages[0] : await browser.newPage();
 
-    // noinspection JSUnusedLocalSymbols
-    page.on('request', request => {
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    page.on('request', (_request) => {
       // console.debug('>', request.method(), request.url());
     });
 
     return new Promise<Token>((resolve, reject) => {
-      page.on('response', response => {
+      page.on('response', (response) => {
         // console.debug('<', response.status(), response.statusText());
 
         if (response.status() === 302) {
@@ -54,5 +50,4 @@ export class Authorizer {
       });
     });
   }
-
 }
diff --git a/src/services/chromium/context.ts b/src/services/chromium/context.ts
index 475d6f0..c176a31 100644
--- a/src/services/chromium/context.ts
+++ b/src/services/chromium/context.ts
@@ -1,13 +1,15 @@
-import { join } from "path";
-import { platform } from "os";
+import { join } from 'path';
+import { platform } from 'os';
 
 export type ChromiumContext = {
   directory: string;
   executable: string;
 };
 
-export function createChromiumContext(chromiumDirectory: string) {
-  const getDirectory = name => join(chromiumDirectory, name);
+export function createChromiumContext(
+  chromiumDirectory: string
+): ChromiumContext {
+  const getDirectory = (name) => join(chromiumDirectory, name);
   const target = platform();
 
   if (target === 'win32') {
diff --git a/src/services/chromium/finder.ts b/src/services/chromium/finder.ts
index 83bed4e..22c9266 100644
--- a/src/services/chromium/finder.ts
+++ b/src/services/chromium/finder.ts
@@ -1,19 +1,13 @@
-import { join } from "path";
+import { join } from 'path';
 import { stat, Stats } from 'fs';
 
 import { ChromiumContext, createChromiumContext } from './context';
 
 export class ChromiumFinder {
-
-  constructor(
-    private baseDirectory: string,
-  ) {
-  }
+  constructor(private baseDirectory: string) {}
 
   async find(): Promise<ChromiumContext> {
-    return createChromiumContext(
-      await this.getChromiumDirectory(),
-    );
+    return createChromiumContext(await this.getChromiumDirectory());
   }
 
   private async getChromiumDirectory(): Promise<string> {
@@ -23,9 +17,7 @@ export class ChromiumFinder {
     return this.tryDirectory(defaultDirectory)
       .catch(() => this.tryDirectory(fallbackDirectory))
       .catch(() => {
-        throw new Error(
-          'Failed to resolve Chromium. Have you downloaded it?',
-        );
+        throw new Error('Failed to resolve Chromium. Have you downloaded it?');
       });
   }
 
@@ -53,5 +45,4 @@ export class ChromiumFinder {
       });
     });
   }
-
 }
diff --git a/src/services/chromium/resolver.ts b/src/services/chromium/resolver.ts
index 9ecf2fc..8756f75 100644
--- a/src/services/chromium/resolver.ts
+++ b/src/services/chromium/resolver.ts
@@ -1,18 +1,30 @@
-import { createReadStream, createWriteStream, readdir, Dirent, PathLike, promises, constants } from 'fs';
+import {
+  createReadStream,
+  createWriteStream,
+  readdir,
+  Dirent,
+  PathLike,
+  promises,
+  constants,
+} from 'fs';
 import { tmpdir } from 'os';
 import { join } from 'path';
 
 import { ChromiumContext } from './context';
 
 const { chmod, mkdir } = promises;
-const { S_IRUSR, S_IWUSR, S_IXUSR, S_IRGRP, S_IXGRP, S_IROTH, S_IXOTH } = constants;
+const {
+  S_IRUSR,
+  S_IWUSR,
+  S_IXUSR,
+  S_IRGRP,
+  S_IXGRP,
+  S_IROTH,
+  S_IXOTH,
+} = constants;
 
 export class ChromiumResolver {
-
-  constructor(
-    private context: ChromiumContext,
-  ) {
-  }
+  constructor(private context: ChromiumContext) {}
 
   async resolve(): Promise<string> {
     const context = this.context;
@@ -27,7 +39,7 @@ export class ChromiumResolver {
     // Change mode to `rwx r-x r-x`
     await chmod(
       executable,
-      S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH,  // 755
+      S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH // 755
     );
 
     return executable;
@@ -70,14 +82,17 @@ export class ChromiumResolver {
 
   private readDirectory(path: PathLike): Promise<Dirent[]> {
     return new Promise<Dirent[]>((resolve, reject) => {
-      readdir(path, { withFileTypes: true }, (error: Error | null, dirents: Dirent[]) => {
-        if (error) {
-          return reject(error);
+      readdir(
+        path,
+        { withFileTypes: true },
+        (error: Error | null, dirents: Dirent[]) => {
+          if (error) {
+            return reject(error);
+          }
+
+          resolve(dirents);
         }
-
-        resolve(dirents);
-      });
+      );
     });
   }
-
 }
diff --git a/src/services/token-storage/filesystem.ts b/src/services/token-storage/filesystem.ts
index 60608a0..df8f1c2 100644
--- a/src/services/token-storage/filesystem.ts
+++ b/src/services/token-storage/filesystem.ts
@@ -10,34 +10,28 @@ const { readFile, stat, writeFile } = promises;
 const defaults = {
   filename: 'token.dat',
   encoding: 'utf8' as BufferEncoding,
-}
+};
 
 export class FilesystemTokenStorage implements ITokenStorage {
-
   private readonly path: string;
 
   constructor(
     directory: string,
     filename: string = defaults.filename,
-    private encoding: BufferEncoding = defaults.encoding,
+    private encoding: BufferEncoding = defaults.encoding
   ) {
     this.path = join(directory, filename);
   }
 
   save(token: Token): Promise<void> {
     return writeFile(this.path, token, {
-        encoding: this.encoding,
+      encoding: this.encoding,
     });
   }
 
   async load(): Promise<Token> {
     if (!(await this.exists())) {
-      throw new Error(
-        format(
-          'File not exists or not a file: %s',
-          this.path,
-        ),
-      );
+      throw new Error(format('File not exists or not a file: %s', this.path));
     }
 
     return await readFile(this.path, {
@@ -56,5 +50,4 @@ export class FilesystemTokenStorage implements ITokenStorage {
       throw error;
     }
   }
-
 }
diff --git a/src/services/token/provider/saved.ts b/src/services/token/provider/saved.ts
index 933217f..504031d 100644
--- a/src/services/token/provider/saved.ts
+++ b/src/services/token/provider/saved.ts
@@ -3,12 +3,7 @@ import { ITokenStorage } from '../../token-storage';
 import { Authorizer, Token } from '../../authorizer';
 
 export class SavedTokenProvider implements ITokenProvider {
-
-  constructor(
-    private storage: ITokenStorage,
-    private authorizer: Authorizer,
-  ) {
-  }
+  constructor(private storage: ITokenStorage, private authorizer: Authorizer) {}
 
   async get(): Promise<Token> {
     if (!(await this.storage.exists())) {
@@ -24,5 +19,4 @@ export class SavedTokenProvider implements ITokenProvider {
 
     return token;
   }
-
 }