diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..f374ba2
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,21 @@
+module.exports = {
+    "env": {
+        "browser": true,
+        "commonjs": true,
+        "es2021": true,
+        "jest/globals": true
+    },
+    "extends": "eslint:recommended",
+    "parser": 'babel-eslint',
+    "parserOptions": {
+        "ecmaVersion": 12,
+        "sourceType": "module"
+    },
+    plugins: [
+        "flowtype",
+        "jest",
+    ],
+    "rules": {
+        "no-unused-vars": ["warn", { argsIgnorePattern: "^_" }],
+    }
+};
diff --git a/package-lock.json b/package-lock.json
index 3a76155..5bfd3eb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -499,6 +499,68 @@
         "secure-random": "1.1.2"
       }
     },
+    "@eslint/eslintrc": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.1.3.tgz",
+      "integrity": "sha512-4YVwPkANLeNtRjMekzux1ci8hIaH5eGKktGqR0d3LWsKNn5B2X/1Z6Trxy7jQXl9EBGE6Yj02O+t09FMeRllaA==",
+      "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": "^4.17.19",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "6.12.5",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.5.tgz",
+          "integrity": "sha512-lRF8RORchjpKG50/WFf8xmg7sgCLFiYNNnqdKflk63whMQcWR5ngGjiSXkL9bjxy6B2npOK2HSMN49jEBMSkag==",
+          "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"
+          }
+        },
+        "debug": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.2.0.tgz",
+          "integrity": "sha512-IX2ncY78vDTjZMFUdmsvIRFY2Cf4FnD0wRs+nQwJU8Lu99/tPFdb0VybiiMTPe3I6rQmwsqQqRBvxU+bZ/I8sg==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "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"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "strip-json-comments": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
+          "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
+          "dev": true
+        }
+      }
+    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -945,6 +1007,32 @@
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       }
     },
+    "@nodelib/fs.scandir": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz",
+      "integrity": "sha512-eGmwYQn3gxo4r7jdQnkrrN6bY478C3P+a/y72IJukF8LjB6ZHeB3c+Ehacj3sYeSmUXGlnA67/PmbM9CVwL7Dw==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.stat": "2.0.3",
+        "run-parallel": "^1.1.9"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.3.tgz",
+      "integrity": "sha512-bQBFruR2TAwoevBEd/NWMoAAtNGzTRgdrqnYCc7dhzfoNvqPzLyqlEQnzZ3kVnNrSp25iyxE00/3h2fqGAGArA==",
+      "dev": true
+    },
+    "@nodelib/fs.walk": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.4.tgz",
+      "integrity": "sha512-1V9XOY4rDW0rehzbrcqAmHnz8e7SKvX27gh8Gt2WgB0+pdzdiLV83p72kZPU+jvMbS1qU5mauP2iOvO8rhmurQ==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.scandir": "2.1.3",
+        "fastq": "^1.6.0"
+      }
+    },
     "@root/encoding": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@root/encoding/-/encoding-1.0.1.tgz",
@@ -1064,6 +1152,12 @@
         "@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": {
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       "resolved": "https://registry.npmjs.org/@types/node/-/node-14.0.23.tgz",
@@ -1076,6 +1170,12 @@
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       "dev": true
     },
+    "@types/parse-json": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@types/parse-json/-/parse-json-4.0.0.tgz",
+      "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA==",
+      "dev": true
+    },
     "@types/prettier": {
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       "resolved": "https://registry.npmjs.org/@types/prettier/-/prettier-2.0.2.tgz",
@@ -1103,6 +1203,93 @@
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       "dev": true
     },
+    "@typescript-eslint/experimental-utils": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.1.1.tgz",
+      "integrity": "sha512-jzYsNciHoa4Z3c1URtmeT/bamYm8Dwfw6vuN3WHIE/BXb1iC4KveAnXDErTAZtPVxTYBaYn3n2gbt6F6D2rm1A==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/scope-manager": "4.1.1",
+        "@typescript-eslint/types": "4.1.1",
+        "@typescript-eslint/typescript-estree": "4.1.1",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0"
+      }
+    },
+    "@typescript-eslint/scope-manager": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.1.1.tgz",
+      "integrity": "sha512-0W8TTobCvIIQ2FsrYTffyZGAAFUyIbEHq5EYJb1m7Rpd005jrnOvKOo8ywCLhs/Bm17C+KsrUboBvBAARQVvyA==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.1.1",
+        "@typescript-eslint/visitor-keys": "4.1.1"
+      }
+    },
+    "@typescript-eslint/types": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.1.1.tgz",
+      "integrity": "sha512-zrBiqOKYerMTllKcn+BP+i1b7LW/EbMMYytroXMxUTvFPn1smkCu0D7lSAx29fTUO4jnwV0ljSvYQtn2vNrNxA==",
+      "dev": true
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.1.1.tgz",
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+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.1.1",
+        "@typescript-eslint/visitor-keys": "4.1.1",
+        "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": {
+        "debug": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.2.0.tgz",
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+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "semver": {
+          "version": "7.3.2",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
+          "integrity": "sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==",
+          "dev": true
+        }
+      }
+    },
+    "@typescript-eslint/visitor-keys": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.1.1.tgz",
+      "integrity": "sha512-/EOOXbA2ferGLG6RmCHEQ0lTTLkOlXYDgblCmQk3tIU7mTPLm4gKhFMeeUSe+bcchTUsKeCk8xcpbop5Zr/8Rw==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.1.1",
+        "eslint-visitor-keys": "^2.0.0"
+      },
+      "dependencies": {
+        "eslint-visitor-keys": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-2.0.0.tgz",
+          "integrity": "sha512-QudtT6av5WXels9WjIM7qz1XD1cWGvX4gGXvp/zBn9nXG02D0utdU3Em2m/QjTnrsk6bBjmCygl3rmj118msQQ==",
+          "dev": true
+        }
+      }
+    },
     "abab": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.3.tgz",
@@ -1131,6 +1318,12 @@
         "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
+    },
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       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
@@ -1171,6 +1364,12 @@
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       }
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+    "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",
@@ -1241,6 +1440,12 @@
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       "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
+    },
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@@ -1275,6 +1480,12 @@
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       "dev": true
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+    "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
+    },
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       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -1315,6 +1526,20 @@
         }
       }
     },
+    "babel-eslint": {
+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-10.1.0.tgz",
+      "integrity": "sha512-ifWaTHQ0ce+448CYop8AdrQiBsGrnC+bMgfyKFdi6EsPLTAWG+QfyDeM6OH+FmWnKvEq5NnBMLvlBUPKQZoDSg==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.7.0",
+        "@babel/traverse": "^7.7.0",
+        "@babel/types": "^7.7.0",
+        "eslint-visitor-keys": "^1.0.0",
+        "resolve": "^1.12.0"
+      }
+    },
     "babel-jest": {
       "version": "26.1.0",
       "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-26.1.0.tgz",
@@ -1843,6 +2068,12 @@
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       "dev": true
     },
+    "compare-versions": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/compare-versions/-/compare-versions-3.6.0.tgz",
+      "integrity": "sha512-W6Af2Iw1z4CB7q4uU4hv646dW9GQuBM+YpC0UvUCWSD8w90SJjp+ujJuXaEMtAXBtSqGfMPuFOVn4/+FlaqfBA==",
+      "dev": true
+    },
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@@ -1921,6 +2152,19 @@
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       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
+    "cosmiconfig": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
+      "integrity": "sha512-pondGvTuVYDk++upghXJabWzL6Kxu6f26ljFw64Swq9v6sQPUL3EUlVDV56diOjpCayKihL6hVe8exIACU4XcA==",
+      "dev": true,
+      "requires": {
+        "@types/parse-json": "^4.0.0",
+        "import-fresh": "^3.2.1",
+        "parse-json": "^5.0.0",
+        "path-type": "^4.0.0",
+        "yaml": "^1.10.0"
+      }
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@@ -2166,6 +2410,24 @@
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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"
+      }
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@@ -2255,6 +2517,15 @@
         "once": "^1.4.0"
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+    "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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@@ -2327,12 +2598,303 @@
         "source-map": "~0.6.1"
       }
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+    "eslint": {
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.9.0.tgz",
+      "integrity": "sha512-V6QyhX21+uXp4T+3nrNfI3hQNBDa/P8ga7LoQOenwrlEFXrEnUEE+ok1dMtaS3b6rmLXhT1TkTIsG75HMLbknA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@eslint/eslintrc": "^0.1.3",
+        "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": "^2.1.0",
+        "eslint-visitor-keys": "^1.3.0",
+        "espree": "^7.3.0",
+        "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",
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+          "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"
+          }
+        }
+      }
+    },
     "term-size": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/term-size/-/term-size-2.2.0.tgz",
@@ -6629,6 +7559,12 @@
         }
       }
     },
+    "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
+    },
     "throat": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/throat/-/throat-5.0.0.tgz",
@@ -6723,6 +7659,21 @@
         "punycode": "^2.1.1"
       }
     },
+    "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"
+      }
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -6898,6 +7849,12 @@
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
       "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
     },
+    "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
+    },
     "v8-to-istanbul": {
       "version": "4.1.4",
       "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-4.1.4.tgz",
@@ -7050,6 +8007,12 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
+      "dev": true
+    },
     "widest-line": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-3.1.0.tgz",
@@ -7098,6 +8061,15 @@
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "write-file-atomic": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
@@ -7145,6 +8117,12 @@
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
       "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
     },
+    "yaml": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
+      "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg==",
+      "dev": true
+    },
     "yargs": {
       "version": "15.4.1",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
diff --git a/package.json b/package.json
index 9b3cbee..31df235 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "test": "jest",
     "dev": "nodemon --exec babel-node src/index.js | bunyan",
     "flow": "flow",
-    "lint": "eslint src config",
+    "lint": "eslint src test",
     "_flow-remove-types": "flow-remove-types ./src/ -d ./flow-removed/ --all --pretty",
     "start": "npm run _flow-remove-types && node ./flow-removed/index.js"
   },
@@ -20,6 +20,11 @@
   "bugs": {
     "url": "https://github.com/Emurgo/yoroi-ergo-backend/issues"
   },
+  "husky": {
+    "hooks": {
+      "pre-push": "npm run flow && npm run lint"
+    }
+  },
   "homepage": "https://github.com/Emurgo/yoroi-ergo-backend#readme",
   "dependencies": {
     "@coinbarn/ergo-ts": "^0.3.0",
@@ -34,8 +39,13 @@
   "devDependencies": {
     "@babel/node": "^7.10.5",
     "@babel/preset-flow": "^7.10.4",
-    "flow-bin": "^0.129.0",
+    "babel-eslint": "^10.1.0",
+    "eslint": "^7.9.0",
+    "eslint-plugin-flowtype": "^5.2.0",
+    "eslint-plugin-jest": "^24.0.2",
+    "flow-bin": "^0.134.0",
     "flow-remove-types": "^2.129.0",
+    "husky": "^4.3.0",
     "jest": "^26.1.0",
     "nodemon": "^2.0.4"
   }
diff --git a/src/api.js b/src/api.js
index ddd1aec..7433adc 100644
--- a/src/api.js
+++ b/src/api.js
@@ -13,13 +13,11 @@ import type {
   FilterUsedOutput,
   TxBodiesInput,
   HistoryInput,
-  HistoryOutput,
   StatusOutput,
 } from './types/wrapperApi';
 import type {
   HandlerFunction,
   UtilEither,
-  UtilOK,
 } from './types/utils';
 import type {
   getApiV0BlocksP1SuccessResponse,
@@ -110,7 +108,7 @@ const askTransactionHistory = async (
   };
 }
 
-const bestBlock: HandlerFunction = async function (req, _res) {
+const bestBlock: HandlerFunction = async function (_req, _res) {
   const resp = await fetch(
     `${config.backend.explorer}/api/v0/blocks`
   );
@@ -157,7 +155,7 @@ async function getUtxoForAddress(address: string): Promise<UtilEither<UtxoForAdd
   const result = r.items.map(({ outputs }) => (
     outputs
       .map((output, index) => ({ output, index }))
-      .filter(({ output, index }) =>
+      .filter(({ output, }) =>
         output.address === address && output.spentTransactionId === null
       )
   ))
@@ -307,7 +305,7 @@ const history: HandlerFunction = async function (req, _res) {
   const verifiedBody = utils.validateHistoryReq(addressesRequestLimit, apiResponseLimit, input);
 
   switch (verifiedBody.kind) {
-    case "ok":
+    case "ok": {
       const body = verifiedBody.value;
       const limit = apiResponseLimit;
       const [referenceTx, referenceBlock] = (body.after && [body.after.tx, body.after.block]) || [undefined, undefined];
@@ -350,16 +348,16 @@ const history: HandlerFunction = async function (req, _res) {
       });
 
       return { status: 200, body: txs };
-
-    case "error":
+    }
+    case "error": {
       console.log(verifiedBody.errMsg);
       return { status: 400, body: verifiedBody.errMsg };
-
+    }
     default: return utils.assertNever(verifiedBody);
   }
 }
 
-const status: HandlerFunction = async function (req, _res) {
+const status: HandlerFunction = async function (_req, _res) {
   const resp = await fetch(
       `${config.backend.explorer}/api/v0/info`
   );
diff --git a/src/types/explorer.js b/src/types/explorer.js
index a1b49bf..2e0f8ce 100644
--- a/src/types/explorer.js
+++ b/src/types/explorer.js
@@ -215,14 +215,6 @@ export type getApiV0AddressesP1Response = getApiV0AddressesP1SuccessResponse | F
 
 // api/v0/transactions/${txHash}
 export type getApiV0TransactionsP1SuccessResponse = {
-  "id": string,
-  "miniBlockInfo": {
-    "id": string,
-    "height": number,
-    ...,
-  },
-  "timestamp": number,
-  "confirmationsCount": number,
   "inputs": Array<{
     "id": string,
     "spendingProof": string,
@@ -262,7 +254,6 @@ export type getApiV0TransactionsP1SuccessResponse = {
     "mainChain": boolean,
     ...,
   }>,
-  "size": number,
   "ioSummary": {
     "totalCoinsTransferred": number,
     "totalFee": number,
@@ -271,6 +262,7 @@ export type getApiV0TransactionsP1SuccessResponse = {
   },
   "summary": {
     id: string,
+    confirmationsCount: number,
     timestamp: number,
     size: number,
     index: number,
diff --git a/src/types/utils.js b/src/types/utils.js
index dc55a58..c263c61 100644
--- a/src/types/utils.js
+++ b/src/types/utils.js
@@ -8,6 +8,7 @@ export type HandlerReturn = {|
 
 /** All functions exposed through an endpoint must be of type HandlerFunction */
 export type HandlerFunction =
+  // $FlowExpectedError[value-as-type] missing type for this library, so error is expected
   (request: Request, response: Response) => Promise<HandlerReturn>;
 
 export type HandlerDefinitions = Array<{|
diff --git a/test/test.js b/test/test.js
index 001a555..f0074da 100644
--- a/test/test.js
+++ b/test/test.js
@@ -83,6 +83,7 @@ const specs: Array<Spec> = [
       // Must skip 'confirmationsCount' when comparing.
       // since the # of confirmations since we wrote this test keeps increasing
       const normalizeTxString = (tx: getApiV0TransactionsP1SuccessResponse) => {
+        // $FlowExpectedError[incompatible-type] delete on purpose to match test
         delete tx.summary.confirmationsCount;
         return tx;
       };