diff --git a/server/.eslintrc.js b/server/.eslintrc.js
new file mode 100644
index 000000000..b41dc444e
--- /dev/null
+++ b/server/.eslintrc.js
@@ -0,0 +1,8 @@
+module.exports = {
+  parser: 'babel-eslint',
+  extends: 'airbnb-base',
+  rules: {
+    'no-underscore-dangle': 'off',
+    'no-param-reassign': 'off'
+  }
+};
diff --git a/server/package-lock.json b/server/package-lock.json
index ef36278b3..7a13f7e72 100644
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -4,6 +4,189 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
+      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.1.3.tgz",
+      "integrity": "sha512-ZoCZGcfIJFJuZBqxcY9OjC1KW2lWK64qrX1o4UYL3yshVhwKFYgzpWZ0vvtGMNJdTlvkw0W+HR1VnYN8q3QPFQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.1.3",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.10",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      },
+      "dependencies": {
+        "jsesc": {
+          "version": "2.5.1",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.1.tgz",
+          "integrity": "sha1-5CGiqOINawgZ3yiQj3glJrlt0f4=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
+      "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.0.0",
+        "@babel/template": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
+      "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0.tgz",
+      "integrity": "sha512-MXkOJqva62dfC0w85mEf/LucPPS/1+04nmmRMPEBUB++hiiThQ2zPtX/mEWQ3mtzCEjIJvPY8nuwxXtQeQwUag==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
+      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "dev": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
+        },
+        "chalk": {
+          "version": "2.4.1",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.1.tgz",
+          "integrity": "sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          }
+        },
+        "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
+        },
+        "supports-color": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        }
+      }
+    },
+    "@babel/parser": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.1.3.tgz",
+      "integrity": "sha512-gqmspPZOMW3MIRb9HlrnbZHXI1/KHTOroBwN1NcLL6pWxzqzEKGvRTq0W/PxS45OtQGbaFikSQpkS5zbnsQm2w==",
+      "dev": true
+    },
+    "@babel/template": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.1.2.tgz",
+      "integrity": "sha512-SY1MmplssORfFiLDcOETrW7fCLl+PavlwMh92rrGcikQaRq4iWPVH0MpwPpY3etVMx6RnDjXtr6VZYr/IbP/Ag==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.1.2",
+        "@babel/types": "^7.1.2"
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.1.4",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.1.4.tgz",
+      "integrity": "sha512-my9mdrAIGdDiSVBuMjpn/oXYpva0/EZwWL3sm3Wcy/AVWO2eXnsoZruOT9jOGNRXU8KbCIu5zsKnXcAJ6PcV6Q==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.1.3",
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/helper-split-export-declaration": "^7.0.0",
+        "@babel/parser": "^7.1.3",
+        "@babel/types": "^7.1.3",
+        "debug": "^3.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.10"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.2.6",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
+          "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "globals": {
+          "version": "11.8.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-11.8.0.tgz",
+          "integrity": "sha512-io6LkyPVuzCHBSQV9fmOwxZkUk6nIaGmxheLDgmuFv89j0fm2aqDbIXKAGfzCMHqz3HLF2Zf8WSG6VqMh2qFmA==",
+          "dev": true
+        },
+        "ms": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
+          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
+          "dev": true
+        }
+      }
+    },
+    "@babel/types": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.1.3.tgz",
+      "integrity": "sha512-RpPOVfK+yatXyn8n4PB1NW6k9qjinrXrRR8ugBN8fD6hCy5RXI6PSbVqpOJBO9oSaY7Nom4ohj35feb0UR9hSA==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2",
+        "lodash": "^4.17.10",
+        "to-fast-properties": "^2.0.0"
+      },
+      "dependencies": {
+        "to-fast-properties": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+          "dev": true
+        }
+      }
+    },
     "@sentry/core": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/@sentry/core/-/core-4.1.1.tgz",
@@ -76,6 +259,30 @@
         "negotiator": "0.6.1"
       }
     },
+    "acorn": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.2.tgz",
+      "integrity": "sha512-GXmKIvbrN3TV7aVqAzVFaMW8F8wzVX7voEBRO3bDA64+EX37YSayggRJP5Xig6HYHBkWKpFg9W5gg6orklubhg==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.0.tgz",
+      "integrity": "sha512-XkB50fn0MURDyww9+UYL3c1yLbOBz0ZFvrdYlGB8l+Ije1oSC75qAqrzSPjYQbdnQUzhlUGNKuesryAv0gxZOg==",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.5.4",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.5.4.tgz",
+      "integrity": "sha512-4Wyjt8+t6YszqaXnLDfMmG/8AlO5Zbcsy3ATHncCzjW/NoPzAId8AK6749Ybjmdt+kUY1gP60fCu46oDxPv/mg==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
     "ansi-align": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-2.0.0.tgz",
@@ -85,6 +292,12 @@
         "string-width": "^2.0.0"
       }
     },
+    "ansi-escapes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "dev": true
+    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -143,6 +356,21 @@
       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
       "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
     },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "^1.0.1"
+      }
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
     "array-unique": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
@@ -150,6 +378,12 @@
       "dev": true,
       "optional": true
     },
+    "arrify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "dev": true
+    },
     "assign-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
@@ -238,6 +472,32 @@
         "source-map": "^0.5.7"
       }
     },
+    "babel-eslint": {
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-10.0.1.tgz",
+      "integrity": "sha512-z7OT1iNV+TjOwHNLLyJk+HN+YVWX+CLE6fPD2SymJZOZQBs+QIexFjhm4keGTm8MW9xr4EC9Q0PbaLB24V5GoQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.0.0",
+        "@babel/traverse": "^7.0.0",
+        "@babel/types": "^7.0.0",
+        "eslint-scope": "3.7.1",
+        "eslint-visitor-keys": "^1.0.0"
+      },
+      "dependencies": {
+        "eslint-scope": {
+          "version": "3.7.1",
+          "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-3.7.1.tgz",
+          "integrity": "sha1-PWPD7f2gLgbgGkUq2IyqzHzctug=",
+          "dev": true,
+          "requires": {
+            "esrecurse": "^4.1.0",
+            "estraverse": "^4.1.1"
+          }
+        }
+      }
+    },
     "babel-generator": {
       "version": "6.26.1",
       "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.1.tgz",
@@ -1138,6 +1398,12 @@
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       "integrity": "sha512-IQX9/h7WdMBIW/q/++tGd+emQr0XMdeZ6icnT/74Xk9fnabWn+gZgpE+9V+gujL3hhJOoNrnDVY7tWdzc7NUTg=="
     },
+    "builtin-modules": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
+      "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
+      "dev": true
+    },
     "bytes": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
@@ -1168,6 +1434,21 @@
         }
       }
     },
+    "caller-path": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
+      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
+      "dev": true,
+      "requires": {
+        "callsites": "^0.2.0"
+      }
+    },
+    "callsites": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
+      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "dev": true
+    },
     "camelcase": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
@@ -1199,6 +1480,12 @@
         "supports-color": "^2.0.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
     "charenc": {
       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/charenc/-/charenc-0.0.2.tgz",
@@ -1228,6 +1515,12 @@
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       "dev": true
     },
+    "circular-json": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
+      "integrity": "sha512-UZK3NBx2Mca+b5LsG7bY183pHWt5Y1xts4P3Pz7ENTwGVnJOUWbRb3ocjvX7hx9tq/yTAdclXm9sZ38gNuem4A==",
+      "dev": true
+    },
     "class-utils": {
       "version": "0.3.6",
       "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
@@ -1263,6 +1556,21 @@
       "integrity": "sha1-T6kXw+WclKAEzWH47lCdplFocUM=",
       "dev": true
     },
+    "cli-cursor": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
+      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^2.0.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "dev": true
+    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -1319,6 +1627,12 @@
         "xdg-basedir": "^3.0.0"
       }
     },
+    "contains-path": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/contains-path/-/contains-path-0.1.0.tgz",
+      "integrity": "sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=",
+      "dev": true
+    },
     "content-disposition": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
@@ -1435,6 +1749,21 @@
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       "dev": true
     },
+    "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": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
+      "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
+      "dev": true,
+      "requires": {
+        "object-keys": "^1.0.12"
+      }
+    },
     "define-property": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/define-property/-/define-property-2.0.2.tgz",
@@ -1488,6 +1817,29 @@
         }
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+    "del": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/del/-/del-2.2.2.tgz",
+      "integrity": "sha1-wSyYHQZ4RshLyvhiz/kw2Qf/0ag=",
+      "dev": true,
+      "requires": {
+        "globby": "^5.0.0",
+        "is-path-cwd": "^1.0.0",
+        "is-path-in-cwd": "^1.0.0",
+        "object-assign": "^4.0.1",
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+    },
+    "spdx-license-ids": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.2.tgz",
+      "integrity": "sha512-qky9CVt0lVIECkEsYbNILVnPvycuEBkXoMFLRWsREkomQLevYhtRKC+R91a5TOAQ3bCMjikRwhyaRqj1VYatYg==",
+      "dev": true
+    },
     "split": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/split/-/split-1.0.1.tgz",
@@ -4907,9 +6223,15 @@
         "ansi-regex": "^2.0.0"
       }
     },
+    "strip-bom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+      "dev": true
+    },
     "strip-eof": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
@@ -4925,6 +6247,18 @@
       "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
       "dev": true
     },
+    "table": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.1.0.tgz",
+      "integrity": "sha512-e542in22ZLhD/fOIuXs/8yDZ9W61ltF8daM88rkRNtgTIct+vI2fTnAyu/Db2TCfEcI8i7mjZz6meLq0nW7TYg==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.5.3",
+        "lodash": "^4.17.10",
+        "slice-ansi": "1.0.0",
+        "string-width": "^2.1.1"
+      }
+    },
     "term-size": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/term-size/-/term-size-1.2.0.tgz",
@@ -4934,6 +6268,12 @@
         "execa": "^0.7.0"
       }
     },
+    "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
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -4946,6 +6286,15 @@
       "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
       "dev": true
     },
+    "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-fast-properties": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
@@ -5009,6 +6358,21 @@
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "tslib": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
+      "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ==",
+      "dev": true
+    },
+    "type-check": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "~1.1.2"
+      }
+    },
     "type-is": {
       "version": "1.6.16",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
@@ -5183,6 +6547,15 @@
         }
       }
     },
+    "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"
+      }
+    },
     "urix": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
@@ -5230,6 +6603,16 @@
         "user-home": "^1.1.1"
       }
     },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -5258,12 +6641,27 @@
         "string-width": "^2.1.1"
       }
     },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "write-file-atomic": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
diff --git a/server/package.json b/server/package.json
index e3f4f664b..a783ba4fc 100644
--- a/server/package.json
+++ b/server/package.json
@@ -16,8 +16,12 @@
   },
   "devDependencies": {
     "babel-cli": "^6.26.0",
+    "babel-eslint": "^10.0.1",
     "babel-preset-env": "^1.7.0",
     "babel-preset-stage-2": "^6.24.1",
+    "eslint": "^5.8.0",
+    "eslint-config-airbnb-base": "^13.1.0",
+    "eslint-plugin-import": "^2.14.0",
     "nodemon": "^1.18.4"
   },
   "dependencies": {
diff --git a/server/src/app.js b/server/src/app.js
new file mode 100644
index 000000000..b36f54aef
--- /dev/null
+++ b/server/src/app.js
@@ -0,0 +1,40 @@
+import 'dotenv/config';
+import express from 'express';
+import cors from 'cors';
+import graphqlHTTP from 'express-graphql';
+import expressPlayground from 'graphql-playground-middleware-express';
+import * as Sentry from '@sentry/node';
+import schema from './schema';
+
+const app = express();
+
+// Initialising sentry
+Sentry.init({ dsn: process.env.SENTRY_DNS });
+app.use(Sentry.Handlers.requestHandler());
+
+// authorising CORS
+app.use(cors());
+
+// Starting the graphql server
+app.use('/graphql', graphqlHTTP(req => ({
+  schema,
+  context: {
+    userId: req.headers.userid,
+    authorization: req.headers.authorization,
+  },
+  formatError(err) {
+    return {
+      message: err.message,
+      code: err.originalError && err.originalError.code,
+      path: err.path,
+    };
+  },
+})));
+
+// Starting the graphql server
+app.get('/playground', expressPlayground({ endpoint: '/graphql' }));
+
+// Sentry error handling middleware if anything pass through
+app.use(Sentry.Handlers.errorHandler());
+
+export default app;
diff --git a/server/src/db.js b/server/src/db.js
new file mode 100644
index 000000000..4492e884f
--- /dev/null
+++ b/server/src/db.js
@@ -0,0 +1,9 @@
+import 'dotenv/config';
+import mongoose from 'mongoose';
+
+mongoose.connect(`mongodb://${process.env.DB_USERNAME}:${process.env.DB_PASSWORD}@${process.env.DB_DOMAIN}`, { useNewUrlParser: true });
+mongoose.Promise = global.Promise;
+
+const db = mongoose.connection;
+
+export default db;
diff --git a/server/src/enums/EventStatus.js b/server/src/enums/EventStatus.js
new file mode 100644
index 000000000..50a4bc53e
--- /dev/null
+++ b/server/src/enums/EventStatus.js
@@ -0,0 +1,17 @@
+export const UNPUBLISHED = 'UNPUBLISHED';
+export const PUBLISHED = 'PUBLISHED';
+export const CANCELLED = 'CANCELLED';
+export const RUNNING = 'RUNNING';
+export const INTERRUPTED = 'INTERRUPTED';
+export const FINISHED = 'FINISHED';
+
+export const EventStatusEnum = [
+  UNPUBLISHED,
+  PUBLISHED,
+  CANCELLED,
+  RUNNING,
+  INTERRUPTED,
+  FINISHED,
+];
+
+export default EventStatusEnum;
diff --git a/server/src/errors/index.js b/server/src/errors/index.js
index b1085fedf..16c3974f1 100644
--- a/server/src/errors/index.js
+++ b/server/src/errors/index.js
@@ -1,19 +1,45 @@
-export class AuthentificationError extends Error {
+import * as Sentry from '@sentry/node';
+
+class ClientError extends Error {
+  constructor(args) {
+    super(args);
+    Sentry.configureScope((scope) => {
+      scope.setLevel('debug');
+    });
+    Sentry.captureException(this);
+  }
+}
+
+class ServerError extends Error {
+  constructor(args) {
+    super(args);
+    Sentry.configureScope((scope) => {
+      scope.setLevel('error');
+    });
+    Sentry.captureException(this);
+  }
+}
+
+export class AuthentificationError extends ClientError {
   code = 401
+
   message = 'Autentification not found, you have to be authentificated to perform this action'
 }
 
-export class DatabaseError extends Error {
+export class DatabaseError extends ClientError {
   code = 404
-  message = 'Ressource not found : ' + this.message
+
+  message = `Ressource not found : ${this.message}`
 }
 
-export class WrongArgumentsError extends Error {
+export class WrongArgumentsError extends ClientError {
   code = 400
-  message = 'Wrong arguments : ' + this.message
+
+  message = `Wrong arguments : ${this.message}`
 }
 
-export class ServiceUnavailableError extends Error {
+export class ServiceUnavailableError extends ServerError {
   code = 503
-  message = 'At least one service is unresponding ' + this.message
+
+  message = `At least one service is unresponding ${this.message}`
 }
diff --git a/server/src/index.js b/server/src/index.js
index c68ba1e9f..f9b2c65f3 100644
--- a/server/src/index.js
+++ b/server/src/index.js
@@ -1,55 +1,22 @@
-import express from 'express'
-import 'dotenv/config'
-import cors from 'cors'
-import mongoose from 'mongoose'
-import graphqlHTTP from 'express-graphql'
-import expressPlayground from 'graphql-playground-middleware-express'
+/* eslint-disable no-console */
+import * as Sentry from '@sentry/node';
+import db from './db';
+import app from './app';
 
-import schema from './schema'
-import * as Sentry from '@sentry/node'
-
-// Initialise express
-const app = express()
-
-// Initialising sentry
-Sentry.init({ dsn: process.env.SENTRY_DNS })
-app.use(Sentry.Handlers.requestHandler())
-
-// Allow cross origing request
-app.use(cors())
-/* -------------------------------------------------
----------------- Database setup --------------------
-------------------------------------------------- */
-// Database Connection
-mongoose.connect(`mongodb://${process.env.DB_USERNAME}:${process.env.DB_PASSWORD}@${process.env.DB_DOMAIN}`, { useNewUrlParser: true })
-
-// Get Mongoose to use the global promise library
-mongoose.Promise = global.Promise
-
-// Get the default connection
-var db = mongoose.connection
-
-// bind error and success to console log
-db.on('error', () => { console.error.bind(console, 'MongoDB connection error:') })
-db.once('open', () => { console.log('Connected to the DB.') })
-
-/* -------------------------------------------------
------------------ Graphql setup --------------------
-------------------------------------------------- */
-app.use('/graphql', graphqlHTTP(req => {
-  return {
-    schema: schema,
-    context: {
-      userId: req.headers.userid,
-      authorization: req.headers.authorization
-    }
-  }
-}))
-app.get('/playground', expressPlayground({ endpoint: '/graphql' }))
-
-// Sentry error handling middleware
-app.use(Sentry.Handlers.errorHandler())
+// Bind server success and error to sentry
+db.on('error', (err) => {
+  Sentry.configureScope((scope) => {
+    scope.setLevel('error');
+  });
+  Sentry.captureException(err);
+});
+db.once('open', () => {
+  Sentry.configureScope((scope) => {
+    scope.setLevel('info');
+  });
+  Sentry.captureMessage('Connected to the DB.');
+});
 
 app.listen(process.env.PORT, () => {
-  console.log(`Listening on port ${process.env.PORT}`)
-})
+  console.log(`Listening on port ${process.env.PORT}`);
+});
diff --git a/server/src/models/event.js b/server/src/models/event.js
index b547474ab..c72ce3187 100644
--- a/server/src/models/event.js
+++ b/server/src/models/event.js
@@ -1,9 +1,14 @@
-import mongoose, { Schema } from 'mongoose'
-import Plotter from './plotter'
-import Formula from './formula'
+import mongoose, { Schema } from 'mongoose';
+import Plotter from './plotter';
+import Formula from './formula';
+import {
+  UNPUBLISHED,
+  EventStatusEnum,
+} from '../enums/EventStatus';
 
 const eventSchema = new Schema({
   designator: { type: String, required: true },
+  status: { type: String, enum: EventStatusEnum, default: UNPUBLISHED },
   name: { type: String, required: true },
   hostId: { type: String, required: true },
   description: String,
@@ -14,7 +19,7 @@ const eventSchema = new Schema({
   rules: [{
     position: { type: Number, required: true },
     title: { type: String, required: true },
-    description: String
+    description: String,
   }],
   prizes: [{
     rank: { type: Number, required: true },
@@ -22,25 +27,25 @@ const eventSchema = new Schema({
     additional: [{
       condition: String,
       amount: { type: Number, required: true },
-      asset: { type: String, required: true }
-    }]
+      asset: { type: String, required: true },
+    }],
   }],
   participants: [{
     teamId: { type: String, required: true },
     botId: String,
-    releaseId: String
-  }]
-})
+    releaseId: String,
+  }],
+});
 
-eventSchema.pre('find', function () {
-  this.populate('formula').populate('plotter')
-})
-eventSchema.post('save', function (doc, next) {
-  doc.populate('formula').populate('plotter').execPopulate().then(function () {
-    next()
-  })
-})
+eventSchema.pre('find', function populate() {
+  this.populate('formula').populate('plotter');
+});
+eventSchema.post('save', (doc, next) => {
+  doc.populate('formula').populate('plotter').execPopulate().then(() => {
+    next();
+  });
+});
 
-const Event = mongoose.model('Event', eventSchema)
+const Event = mongoose.model('Event', eventSchema);
 
-export default Event
+export default Event;
diff --git a/server/src/models/formula.js b/server/src/models/formula.js
index ca835ec6b..43132bbf2 100644
--- a/server/src/models/formula.js
+++ b/server/src/models/formula.js
@@ -1,11 +1,11 @@
-import mongoose, { Schema } from 'mongoose'
+import mongoose, { Schema } from 'mongoose';
 
 const formulaSchema = new Schema({
   ownerId: { type: String, required: true },
   isTemplate: { type: Boolean, default: false },
-  name: { type: String, required: true }
-})
+  name: { type: String, required: true },
+});
 
-const Formula = mongoose.model('Formula', formulaSchema)
+const Formula = mongoose.model('Formula', formulaSchema);
 
-export default Formula
+export default Formula;
diff --git a/server/src/models/index.js b/server/src/models/index.js
index b35809dd1..251eda8ea 100644
--- a/server/src/models/index.js
+++ b/server/src/models/index.js
@@ -1,9 +1,9 @@
-import Plotter from './plotter'
-import Event from './event'
-import Formula from './formula'
+import Plotter from './plotter';
+import Event from './event';
+import Formula from './formula';
 
 export {
   Event,
   Plotter,
-  Formula
-}
+  Formula,
+};
diff --git a/server/src/models/plotter.js b/server/src/models/plotter.js
index d8fade1e4..77f274206 100644
--- a/server/src/models/plotter.js
+++ b/server/src/models/plotter.js
@@ -1,4 +1,4 @@
-import mongoose, { Schema } from 'mongoose'
+import mongoose, { Schema } from 'mongoose';
 
 const plotterSchema = new Schema({
   ownerId: { type: String, required: true },
@@ -6,9 +6,9 @@ const plotterSchema = new Schema({
   name: { type: String, required: true },
   host: { type: String, required: true },
   repo: { type: String, required: true },
-  moduleName: { type: String, required: true }
-})
+  moduleName: { type: String, required: true },
+});
 
-const Plotter = mongoose.model('Plotter', plotterSchema)
+const Plotter = mongoose.model('Plotter', plotterSchema);
 
-export default Plotter
+export default Plotter;
diff --git a/server/src/schema/index.js b/server/src/schema/index.js
index 4155e4999..81d0b3150 100644
--- a/server/src/schema/index.js
+++ b/server/src/schema/index.js
@@ -1,13 +1,13 @@
 import {
-  GraphQLSchema
-} from 'graphql'
+  GraphQLSchema,
+} from 'graphql';
 
-import Mutation from './mutations'
-import RootQuery from './queries'
+import Mutation from './mutations';
+import RootQuery from './queries';
 
 const Schema = new GraphQLSchema({
   query: RootQuery,
-  mutation: Mutation
-})
+  mutation: Mutation,
+});
 
-export default Schema
+export default Schema;
diff --git a/server/src/schema/mutations/AddPrize.js b/server/src/schema/mutations/AddPrize.js
index 03e79b7c4..ff22e69ab 100644
--- a/server/src/schema/mutations/AddPrize.js
+++ b/server/src/schema/mutations/AddPrize.js
@@ -1,59 +1,62 @@
 import {
   GraphQLNonNull,
   GraphQLID,
-  GraphQLInt
-} from 'graphql'
+  GraphQLInt,
+} from 'graphql';
 import {
   AuthentificationError,
   DatabaseError,
-  WrongArgumentsError
-} from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  WrongArgumentsError,
+} from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   eventDesignator: { type: new GraphQLNonNull(GraphQLID) },
   rank: { type: new GraphQLNonNull(GraphQLInt) },
-  amount: { type: new GraphQLNonNull(GraphQLInt) }
-}
+  amount: { type: new GraphQLNonNull(GraphQLInt) },
+};
 
 const resolve = (parent, { eventDesignator, rank, amount }, context) => {
-  const hostId = context.userId
+  const hostId = context.userId;
   if (!hostId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  return new Promise((resolve, reject) => {
+  return new Promise((res, rej) => {
     Event.findOne({ designator: eventDesignator, hostId }).exec((err, event) => {
       if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events you own respond to that designator'))
-      } else {
-        if (event.prizes.some(prize => prize.rank === rank)) {
-          reject(new WrongArgumentsError('A prize for that rank already exists'))
-        } else {
-          event.prizes.push({
-            rank,
-            amount
-          })
-          event.save((err) => {
-            if (err) reject(err)
-            else {
-              resolve(event)
-            }
-          })
-        }
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      if (!event) {
+        rej(new DatabaseError('None of the events you own respond to that designator'));
+        return;
+      }
+      if (event.prizes.some(prize => prize.rank === rank)) {
+        rej(new WrongArgumentsError('A prize for that rank already exists'));
+        return;
+      }
+      event.prizes.push({
+        rank,
+        amount,
+      });
+      event.save((error) => {
+        if (error) {
+          rej(error);
+          return;
+        }
+        res(event);
+      });
+    });
+  });
+};
 
 const mutation = {
   addPrize: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/AddRule.js b/server/src/schema/mutations/AddRule.js
index 6968ab4e9..c7b43cdb5 100644
--- a/server/src/schema/mutations/AddRule.js
+++ b/server/src/schema/mutations/AddRule.js
@@ -1,64 +1,70 @@
 import {
   GraphQLNonNull,
   GraphQLID,
-  GraphQLString
-} from 'graphql'
+  GraphQLString,
+} from 'graphql';
 import {
   AuthentificationError,
   DatabaseError,
-  WrongArgumentsError
-} from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  WrongArgumentsError,
+} from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   eventDesignator: { type: new GraphQLNonNull(GraphQLID) },
   title: { type: new GraphQLNonNull(GraphQLString) },
-  description: { type: new GraphQLNonNull(GraphQLString) }
-}
+  description: { type: new GraphQLNonNull(GraphQLString) },
+};
 
 const resolve = (parent, { eventDesignator, title, description }, context) => {
-  const hostId = context.userId
+  const hostId = context.userId;
   if (!hostId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  return new Promise((resolve, reject) => {
+  return new Promise((res, rej) => {
     Event.findOne({ designator: eventDesignator, hostId }).exec((err, event) => {
       if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events you own respond to that designator'))
-      } else {
-        if (event.rules.some(rule => rule.title === title)) {
-          reject(new WrongArgumentsError('A prize for that rank already exists'))
-        } else {
-          let position = 1
-          while (event.rules.some(rule => rule.position === position)) {
-            position++
-          }
-          event.rules.push({
-            position,
-            title,
-            description
-          })
-          event.save((err) => {
-            if (err) reject(err)
-            else {
-              resolve(event)
-            }
-          })
-        }
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      if (!event) {
+        rej(new DatabaseError('None of the events you own respond to that designator'));
+        return;
+      }
+      if (event.rules.some(rule => rule.title === title)) {
+        rej(new WrongArgumentsError('A prize for that rank already exists'));
+        return;
+      }
+      const isFree = pos => event.rules.some(rule => rule.pos === pos);
+      let position = 1;
+      let shouldGrow = isFree(position);
+      while (shouldGrow) {
+        position += 1;
+        shouldGrow = isFree(position);
+      }
+      event.rules.push({
+        position,
+        title,
+        description,
+      });
+      event.save((error) => {
+        if (error) {
+          rej(error);
+          return;
+        }
+        res(event);
+      });
+    });
+  });
+};
 
 const mutation = {
   addRule: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/CreateAndSetFormula.js b/server/src/schema/mutations/CreateAndSetFormula.js
index 21f631a1b..d1d45970f 100644
--- a/server/src/schema/mutations/CreateAndSetFormula.js
+++ b/server/src/schema/mutations/CreateAndSetFormula.js
@@ -1,52 +1,56 @@
 import {
   GraphQLNonNull,
-  GraphQLString
-} from 'graphql'
-import { AuthentificationError, DatabaseError } from '../../errors'
-import { EventType } from '../types'
-import { Event, Formula } from '../../models'
+  GraphQLString,
+} from 'graphql';
+import { AuthentificationError, DatabaseError } from '../../errors';
+import { EventType } from '../types';
+import { Event, Formula } from '../../models';
 
 const args = {
   eventDesignator: { type: new GraphQLNonNull(GraphQLString) },
-  name: { type: new GraphQLNonNull(GraphQLString) }
-}
+  name: { type: new GraphQLNonNull(GraphQLString) },
+};
 
 const resolve = (parent, { name, eventDesignator }, context) => {
-  const ownerId = context.userId
+  const ownerId = context.userId;
   if (!ownerId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  let newFormula = new Formula({ name, ownerId })
-  return new Promise((resolve, reject) => {
+  const newFormula = new Formula({ name, ownerId });
+  return new Promise((res, reject) => {
     Event.findOne({ designator: eventDesignator, hostId: ownerId }).exec((err, event) => {
       if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events you own respond to that designator'))
-      } else {
-        newFormula.save((err) => {
-          if (err) reject(err)
-          else {
-          }
-        })
-        event.formula = newFormula._id
-        event.save((err) => {
-          if (err) reject(err)
-          else {
-            resolve(event)
-          }
-        })
+        reject(err);
+        return;
       }
-    })
-  })
-}
+      if (!event) {
+        reject(new DatabaseError('None of the events you own respond to that designator'));
+        return;
+      }
+      newFormula.save((error) => {
+        if (error) {
+          reject(error);
+          return;
+        }
+        event.formula = newFormula._id;
+        event.save((eventError) => {
+          if (eventError) {
+            reject(eventError);
+            return;
+          }
+          res(event);
+        });
+      });
+    });
+  });
+};
 
 const mutation = {
   createAndSetFormula: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/CreateAndSetPlotter.js b/server/src/schema/mutations/CreateAndSetPlotter.js
index 98aa2e7e4..11cbfe846 100644
--- a/server/src/schema/mutations/CreateAndSetPlotter.js
+++ b/server/src/schema/mutations/CreateAndSetPlotter.js
@@ -1,55 +1,65 @@
 import {
   GraphQLNonNull,
-  GraphQLString
-} from 'graphql'
-import { AuthentificationError, DatabaseError } from '../../errors'
-import { EventType } from '../types'
-import { Event, Plotter } from '../../models'
+  GraphQLString,
+} from 'graphql';
+import { AuthentificationError, DatabaseError } from '../../errors';
+import { EventType } from '../types';
+import { Event, Plotter } from '../../models';
 
 const args = {
   eventDesignator: { type: new GraphQLNonNull(GraphQLString) },
   name: { type: new GraphQLNonNull(GraphQLString) },
   host: { type: new GraphQLNonNull(GraphQLString) },
   repo: { type: new GraphQLNonNull(GraphQLString) },
-  moduleName: { type: new GraphQLNonNull(GraphQLString) }
-}
+  moduleName: { type: new GraphQLNonNull(GraphQLString) },
+};
 
-const resolve = (parent, { name, host, repo, moduleName, eventDesignator }, context) => {
-  const ownerId = context.userId
+const resolve = (parent, {
+  name, host, repo, moduleName, eventDesignator,
+}, context) => {
+  const ownerId = context.userId;
   if (!ownerId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  let newPlotter = new Plotter({ name, host, repo, moduleName, ownerId })
-  return new Promise((resolve, reject) => {
+  const newPlotter = new Plotter({
+    name, host, repo, moduleName, ownerId,
+  });
+  return new Promise((res, rej) => {
     Event.findOne({ designator: eventDesignator, hostId: ownerId }).exec((err, event) => {
       if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events you own respond to that designator'))
-      } else {
-        newPlotter.save((err) => {
-          if (err) reject(err)
-          else {
-          }
-        })
-        event.plotter = newPlotter._id
-        event.save((err) => {
-          if (err) reject(err)
-          else {
-            resolve(event)
-          }
-        })
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      if (!event) {
+        rej(new DatabaseError('None of the events you own respond to that designator'));
+        return;
+      }
+
+      newPlotter.save((error) => {
+        if (error) {
+          rej(error);
+          return;
+        }
+
+        event.plotter = newPlotter._id;
+        event.save((eventError) => {
+          if (eventError) {
+            rej(eventError);
+            return;
+          }
+          res(event);
+        });
+      });
+    });
+  });
+};
 
 const mutation = {
   createAndSetPlotter: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/CreateFormula.js b/server/src/schema/mutations/CreateFormula.js
index a8153209a..4ff97b8c1 100644
--- a/server/src/schema/mutations/CreateFormula.js
+++ b/server/src/schema/mutations/CreateFormula.js
@@ -1,37 +1,38 @@
 import {
   GraphQLNonNull,
-  GraphQLString
-} from 'graphql'
-import { AuthentificationError } from '../../errors'
-import { FormulaType } from '../types'
-import { Formula } from '../../models'
+  GraphQLString,
+} from 'graphql';
+import { AuthentificationError } from '../../errors';
+import { FormulaType } from '../types';
+import { Formula } from '../../models';
 
 const args = {
-  name: { type: new GraphQLNonNull(GraphQLString) }
-}
+  name: { type: new GraphQLNonNull(GraphQLString) },
+};
 
 const resolve = (parent, { name }, context) => {
-  const ownerId = context.userId
+  const ownerId = context.userId;
   if (!ownerId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  let newFormula = new Formula({ name, ownerId })
-  return new Promise((resolve, reject) => {
+  const newFormula = new Formula({ name, ownerId });
+  return new Promise((res, rej) => {
     newFormula.save((err) => {
-      if (err) reject(err)
-      else {
-        resolve(newFormula)
+      if (err) {
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      res(newFormula);
+    });
+  });
+};
 
 const mutation = {
   createFormula: {
     type: FormulaType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/CreatePlotter.js b/server/src/schema/mutations/CreatePlotter.js
index 669dc81ec..a4fcdf26a 100644
--- a/server/src/schema/mutations/CreatePlotter.js
+++ b/server/src/schema/mutations/CreatePlotter.js
@@ -1,40 +1,45 @@
 import {
   GraphQLNonNull,
-  GraphQLString
-} from 'graphql'
-import { AuthentificationError } from '../../errors'
-import { PlotterType } from '../types'
-import { Plotter } from '../../models'
+  GraphQLString,
+} from 'graphql';
+import { AuthentificationError } from '../../errors';
+import { PlotterType } from '../types';
+import { Plotter } from '../../models';
 
 const args = {
   name: { type: new GraphQLNonNull(GraphQLString) },
   host: { type: new GraphQLNonNull(GraphQLString) },
   repo: { type: new GraphQLNonNull(GraphQLString) },
-  moduleName: { type: new GraphQLNonNull(GraphQLString) }
-}
+  moduleName: { type: new GraphQLNonNull(GraphQLString) },
+};
 
-const resolve = (parent, { name, host, repo, moduleName }, context) => {
-  const ownerId = context.userId
+const resolve = (parent, {
+  name, host, repo, moduleName,
+}, context) => {
+  const ownerId = context.userId;
   if (!ownerId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  let newPlotter = new Plotter({ name, host, repo, moduleName, ownerId })
-  return new Promise((resolve, reject) => {
+  const newPlotter = new Plotter({
+    name, host, repo, moduleName, ownerId,
+  });
+  return new Promise((res, reject) => {
     newPlotter.save((err) => {
-      if (err) reject(err)
-      else {
-        resolve(newPlotter)
+      if (err) {
+        reject(err);
+        return;
       }
-    })
-  })
-}
+      res(newPlotter);
+    });
+  });
+};
 
 const mutation = {
   createPlotter: {
     type: PlotterType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/EditEvent.js b/server/src/schema/mutations/EditEvent.js
index de5271efb..e60cf6cbd 100644
--- a/server/src/schema/mutations/EditEvent.js
+++ b/server/src/schema/mutations/EditEvent.js
@@ -2,11 +2,11 @@ import {
   GraphQLNonNull,
   GraphQLID,
   GraphQLInt,
-  GraphQLString
-} from 'graphql'
-import { AuthentificationError, DatabaseError } from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  GraphQLString,
+} from 'graphql';
+import { AuthentificationError, DatabaseError } from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   designator: { type: new GraphQLNonNull(GraphQLID) },
@@ -15,45 +15,50 @@ const args = {
   startDatetime: { type: GraphQLInt },
   finishDatetime: { type: GraphQLInt },
   formulaId: { type: GraphQLString },
-  plotterId: { type: GraphQLString }
-}
+  plotterId: { type: GraphQLString },
+};
 
-const resolve = (parent, { designator, name, description, startDatetime, finishDatetime, formulaId, plotterId }, context) => {
-  const hostId = context.userId
+const resolve = (parent, {
+  designator, name, description, startDatetime, finishDatetime, formulaId, plotterId,
+}, context) => {
+  const hostId = context.userId;
   if (!hostId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  return new Promise((resolve, reject) => {
+  return new Promise((res, rej) => {
     Event.findOne({ designator, hostId }).exec((err, event) => {
       if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events you own respond to that designator'))
-      } else {
-        event.name = name || event.name
-        event.description = description || event.description
-        event.startDatetime = startDatetime || event.startDatetime
-        event.finishDatetime = finishDatetime || event.finishDatetime
-        event.formula = formulaId || event.formula
-        event.plotter = plotterId || event.plotter
-
-        event.save((err) => {
-          if (err) reject(err)
-          else {
-            resolve(event)
-          }
-        })
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      if (!event) {
+        rej(new DatabaseError('None of the events you own respond to that designator'));
+        return;
+      }
+      event.name = name || event.name;
+      event.description = description || event.description;
+      event.startDatetime = startDatetime || event.startDatetime;
+      event.finishDatetime = finishDatetime || event.finishDatetime;
+      event.formula = formulaId || event.formula;
+      event.plotter = plotterId || event.plotter;
+
+      event.save((error) => {
+        if (error) {
+          rej(error);
+          return;
+        }
+        res(event);
+      });
+    });
+  });
+};
 
 const mutation = {
   editEvent: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/EditParticipant.js b/server/src/schema/mutations/EditParticipant.js
index 855370afa..0abb8db32 100644
--- a/server/src/schema/mutations/EditParticipant.js
+++ b/server/src/schema/mutations/EditParticipant.js
@@ -1,30 +1,32 @@
 import {
   GraphQLNonNull,
   GraphQLID,
-  GraphQLString
-} from 'graphql'
-import axios from 'axios'
+  GraphQLString,
+} from 'graphql';
+import axios from 'axios';
 import {
   AuthentificationError,
   WrongArgumentsError,
-  ServiceUnavailableError
-} from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  ServiceUnavailableError,
+} from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   eventDesignator: { type: new GraphQLNonNull(GraphQLID) },
   teamId: { type: new GraphQLNonNull(GraphQLString) },
   botId: { type: GraphQLString },
-  releaseId: { type: GraphQLString }
-}
+  releaseId: { type: GraphQLString },
+};
 
-const resolve = (parent, { eventDesignator, teamId, botId, releaseId }, context) => {
-  const userid = context.userId
+const resolve = (parent, {
+  eventDesignator, teamId, botId, releaseId,
+}, context) => {
+  const userid = context.userId;
   if (!userid) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  return new Promise((resolve, reject) => {
+  return new Promise((res, rej) => {
     axios({
       url: process.env.TEAMS_ENDPOINT,
       method: 'post',
@@ -35,53 +37,53 @@ const resolve = (parent, { eventDesignator, teamId, botId, releaseId }, context)
               id
             }
           }
-        `
+        `,
       },
       headers: {
         userid,
-        authorization: context.authorization
-      }
+        authorization: context.authorization,
+      },
     }).then(
       (result) => {
         if (!result.data.data.teamsByRole.some(team => team.id === teamId)) {
-          reject(new WrongArgumentsError('You are not eligible to register this team'))
-          return
+          rej(new WrongArgumentsError('You are not eligible to register this team'));
+          return;
         }
         Event.findOne({ designator: eventDesignator }).exec((err, event) => {
-          if (err) reject(err)
-          else {
-            let participantIndex
-            event.participants.find((participant, index) => {
-              if (participant.teamId === teamId) {
-                participantIndex = index
-              }
-            })
-
-            event.participants[participantIndex].botId = botId || event.participants[participantIndex].botId
-            event.participants[participantIndex].releaseId = releaseId || event.participants[participantIndex].releaseId
-
-            event.save((err) => {
-              if (err) reject(err)
-              else {
-                resolve(event)
-              }
-            })
+          if (err) {
+            rej(err);
+            return;
           }
-        })
+          const participantIndex = event.participant
+            .findIndex(participant => participant.teamId === teamId);
+
+          event.participants[participantIndex].botId = botId
+            || event.participants[participantIndex].botId;
+          event.participants[participantIndex].releaseId = releaseId
+            || event.participants[participantIndex].releaseId;
+
+          event.save((error) => {
+            if (error) {
+              rej(error);
+              return;
+            }
+            res(event);
+          });
+        });
       },
       (error) => {
-        reject(new ServiceUnavailableError(error))
-      }
-    )
-  })
-}
+        rej(new ServiceUnavailableError(error));
+      },
+    );
+  });
+};
 
 const mutation = {
   editParticipant: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/EditPrize.js b/server/src/schema/mutations/EditPrize.js
index 70a033f3b..279733d85 100644
--- a/server/src/schema/mutations/EditPrize.js
+++ b/server/src/schema/mutations/EditPrize.js
@@ -1,58 +1,56 @@
 import {
   GraphQLNonNull,
   GraphQLID,
-  GraphQLInt
-} from 'graphql'
-import { AuthentificationError, DatabaseError } from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  GraphQLInt,
+} from 'graphql';
+import { AuthentificationError, DatabaseError } from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   eventDesignator: { type: new GraphQLNonNull(GraphQLID) },
   rank: { type: new GraphQLNonNull(GraphQLInt) },
-  amount: { type: GraphQLInt }
-}
+  amount: { type: GraphQLInt },
+};
 
 const resolve = (parent, { eventDesignator, rank, amount }, context) => {
-  const hostId = context.userId
+  const hostId = context.userId;
   if (!hostId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  return new Promise((resolve, reject) => {
+  return new Promise((res, rej) => {
     Event.findOne({ designator: eventDesignator, hostId }).exec((err, event) => {
       if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events you own respond to that designator'))
-      } else {
-        let prizeIndex = null
-        event.prizes.find((prize, index) => {
-          if (prize.rank === rank) {
-            prizeIndex = index
-          }
-        })
-        if (!prizeIndex) {
-          reject(new DatabaseError('There is no prize for that index'))
-          return
-        }
-        event.prizes[prizeIndex].amount = amount || event.prizes[prizeIndex].amount
-        event.save((err) => {
-          if (err) reject(err)
-          else {
-            resolve(event)
-          }
-        })
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      if (!event) {
+        rej(new DatabaseError('None of the events you own respond to that designator'));
+        return;
+      }
+      const prizeIndex = event.prizes.findIndex(prize => prize.rank === rank);
+      if (!prizeIndex) {
+        rej(new DatabaseError('There is no prize for that index'));
+        return;
+      }
+      event.prizes[prizeIndex].amount = amount || event.prizes[prizeIndex].amount;
+      event.save((error) => {
+        if (error) {
+          rej(error);
+          return;
+        }
+        res(event);
+      });
+    });
+  });
+};
 
 const mutation = {
   editPrize: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/EditRule.js b/server/src/schema/mutations/EditRule.js
index d772dc011..c931151ce 100644
--- a/server/src/schema/mutations/EditRule.js
+++ b/server/src/schema/mutations/EditRule.js
@@ -1,65 +1,64 @@
 import {
   GraphQLNonNull,
   GraphQLID,
-  GraphQLString
-} from 'graphql'
-import { AuthentificationError, DatabaseError, WrongArgumentsError } from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  GraphQLString,
+} from 'graphql';
+import { AuthentificationError, DatabaseError, WrongArgumentsError } from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   eventDesignator: { type: new GraphQLNonNull(GraphQLID) },
   title: { type: new GraphQLNonNull(GraphQLString) },
   newtitle: { type: GraphQLString },
-  description: { type: GraphQLString }
-}
+  description: { type: GraphQLString },
+};
 
-const resolve = (parent, { eventDesignator, title, newtitle, description }, context) => {
-  const hostId = context.userId
+const resolve = (parent, {
+  eventDesignator, title, newtitle, description,
+}, context) => {
+  const hostId = context.userId;
   if (!hostId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  return new Promise((resolve, reject) => {
+  return new Promise((res, rej) => {
     Event.findOne({ designator: eventDesignator, hostId }).exec((err, event) => {
       if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events you own respond to that designator'))
-      } else {
-        let ruleIndex = null
-        event.rules.find((rule, index) => {
-          if (rule.title === title) {
-            ruleIndex = index
-          }
-        })
-        if (!ruleIndex) {
-          reject(new DatabaseError('There is no rule with that title'))
-          return
-        }
-        event.rules[ruleIndex].description = description || event.rules[ruleIndex].description
-        if (event.rules.some(rule => rule.title === newtitle)) {
-          reject(new WrongArgumentsError('There is already a rule using your new title'))
-        } else {
-          event.rules[ruleIndex].title = newtitle || event.rules[ruleIndex].title
-        }
-
-        event.save((err) => {
-          if (err) reject(err)
-          else {
-            resolve(event)
-          }
-        })
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      if (!event) {
+        rej(new DatabaseError('None of the events you own respond to that designator'));
+        return;
+      }
+      const ruleIndex = event.rules.findIndex(rule => rule.title === title);
+      if (!ruleIndex) {
+        rej(new DatabaseError('There is no rule with that title'));
+        return;
+      }
+      event.rules[ruleIndex].description = description || event.rules[ruleIndex].description;
+      if (event.rules.some(rule => rule.title === newtitle)) {
+        rej(new WrongArgumentsError('There is already a rule using your new title'));
+        return;
+      }
+      event.rules[ruleIndex].title = newtitle || event.rules[ruleIndex].title;
+      event.save((error) => {
+        if (error) {
+          rej(error);
+          return;
+        }
+        res(event);
+      });
+    });
+  });
+};
 
 const mutation = {
   editRule: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/HostEvent.js b/server/src/schema/mutations/HostEvent.js
index a562f6cb4..13fd6b494 100644
--- a/server/src/schema/mutations/HostEvent.js
+++ b/server/src/schema/mutations/HostEvent.js
@@ -1,49 +1,52 @@
 import {
   GraphQLNonNull,
   GraphQLInt,
-  GraphQLString
-} from 'graphql'
-import { AuthentificationError } from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
-import { slugify } from '../../utils/functions'
+  GraphQLString,
+} from 'graphql';
+import { AuthentificationError } from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
+import { slugify } from '../../utils/functions';
 
 const args = {
   name: { type: new GraphQLNonNull(GraphQLString) },
   description: { type: new GraphQLNonNull(GraphQLString) },
   startDatetime: { type: new GraphQLNonNull(GraphQLInt) },
-  finishDatetime: { type: new GraphQLNonNull(GraphQLInt) }
-}
+  finishDatetime: { type: new GraphQLNonNull(GraphQLInt) },
+};
 
-const resolve = (parent, { name, description, startDatetime, finishDatetime }, context) => {
-  const hostId = context.userId
+const resolve = (parent, {
+  name, description, startDatetime, finishDatetime,
+}, context) => {
+  const hostId = context.userId;
   if (!hostId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  let newEvent = new Event({
+  const newEvent = new Event({
     hostId,
     name,
     description,
     startDatetime,
-    finishDatetime
-  })
-  newEvent.designator = slugify(newEvent.name) + '-' + newEvent._id
-  return new Promise((resolve, reject) => {
+    finishDatetime,
+  });
+  newEvent.designator = `${slugify(newEvent.name)}-${newEvent._id}`;
+  return new Promise((res, rej) => {
     newEvent.save((err) => {
-      if (err) reject(err)
-      else {
-        resolve(newEvent)
+      if (err) {
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      res(newEvent);
+    });
+  });
+};
 
 const mutation = {
   hostEvent: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/RegisterToEvent.js b/server/src/schema/mutations/RegisterToEvent.js
index 0c852abc8..7b3ee5050 100644
--- a/server/src/schema/mutations/RegisterToEvent.js
+++ b/server/src/schema/mutations/RegisterToEvent.js
@@ -1,31 +1,33 @@
-import 'dotenv/config'
+import 'dotenv/config';
 import {
   GraphQLNonNull,
   GraphQLID,
-  GraphQLString
-} from 'graphql'
-import axios from 'axios'
+  GraphQLString,
+} from 'graphql';
+import axios from 'axios';
 import {
   AuthentificationError,
   WrongArgumentsError,
-  ServiceUnavailableError
-} from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  ServiceUnavailableError,
+} from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   designator: { type: new GraphQLNonNull(GraphQLID) },
   teamId: { type: new GraphQLNonNull(GraphQLString) },
   botId: { type: GraphQLString },
-  releaseId: { type: GraphQLString }
-}
+  releaseId: { type: GraphQLString },
+};
 
-const resolve = (parent, { designator, teamId, botId, releaseId }, context) => {
-  const userid = context.userId
+const resolve = (parent, {
+  designator, teamId, botId, releaseId,
+}, context) => {
+  const userid = context.userId;
   if (!userid) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  return new Promise((resolve, reject) => {
+  return new Promise((res, rej) => {
     axios({
       url: process.env.TEAMS_ENDPOINT,
       method: 'post',
@@ -36,52 +38,54 @@ const resolve = (parent, { designator, teamId, botId, releaseId }, context) => {
               id
             }
           }
-        `
+        `,
       },
       headers: {
         userid,
-        authorization: context.authorization
-      }
+        authorization: context.authorization,
+      },
     }).then(
       (result) => {
         if (!result.data.data.teamsByRole.some(team => team.id === teamId)) {
-          reject(new WrongArgumentsError('You are not eligible to register this team'))
-          return
+          rej(new WrongArgumentsError('You are not eligible to register this team'));
+          return;
         }
         Event.findOne({ designator }).exec((err, event) => {
-          if (err) reject(err)
-          else {
-            if (event.participants.some(participant => participant.teamId === teamId)) {
-              reject(new WrongArgumentsError('You are already registred'))
-            } else {
-              event.participants.push({
-                teamId,
-                botId,
-                releaseId
-              })
-              event.save((err) => {
-                if (err) reject(err)
-                else {
-                  resolve(event)
-                }
-              })
-            }
+          if (err) {
+            rej(err);
+            return;
           }
-        })
+          if (event.participants.some(participant => participant.teamId === teamId)) {
+            rej(new WrongArgumentsError('You are already registred'));
+            return;
+          }
+          event.participants.push({
+            teamId,
+            botId,
+            releaseId,
+          });
+          event.save((error) => {
+            if (error) {
+              rej(error);
+              return;
+            }
+            res(event);
+          });
+        });
       },
       (error) => {
-        reject(new ServiceUnavailableError(error))
-      }
-    )
-  })
-}
+        rej(new ServiceUnavailableError(error));
+      },
+    );
+  });
+};
 
 const mutation = {
   registerToEvent: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/ReorderRules.js b/server/src/schema/mutations/ReorderRules.js
index 0a29865d4..8f16546aa 100644
--- a/server/src/schema/mutations/ReorderRules.js
+++ b/server/src/schema/mutations/ReorderRules.js
@@ -1,57 +1,60 @@
 import {
   GraphQLNonNull,
   GraphQLID,
-  GraphQLInt
-} from 'graphql'
-import { AuthentificationError, DatabaseError } from '../../errors'
-import { isBetween } from '../../utils/functions'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  GraphQLInt,
+} from 'graphql';
+import { AuthentificationError, DatabaseError } from '../../errors';
+import { isBetween } from '../../utils/functions';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   eventDesignator: { type: new GraphQLNonNull(GraphQLID) },
   fromPosition: { type: new GraphQLNonNull(GraphQLInt) },
-  toPosition: { type: new GraphQLNonNull(GraphQLInt) }
-}
+  toPosition: { type: new GraphQLNonNull(GraphQLInt) },
+};
 
 const resolve = (parent, { eventDesignator, fromPosition, toPosition }, context) => {
-  const hostId = context.userId
+  const hostId = context.userId;
   if (!hostId) {
-    throw new AuthentificationError()
+    throw new AuthentificationError();
   }
-  return new Promise((resolve, reject) => {
+  return new Promise((res, rej) => {
     Event.findOne({ designator: eventDesignator, hostId: context.userId }).exec((err, event) => {
       if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events you own respond to that designator'))
-      } else {
-        const delta = fromPosition > toPosition ? 1 : -1
-        event.rules.forEach((part) => {
-          if (part.position === fromPosition) {
-            part.position = toPosition
-          } else if (isBetween(part.position, fromPosition, toPosition)) {
-            part.position += delta
-          }
-        })
-
-        event.save((err) => {
-          if (err) reject(err)
-          else {
-            resolve(event)
-          }
-        })
+        rej(err);
+        return;
       }
-    })
-  })
-}
+      if (!event) {
+        rej(new DatabaseError('None of the events you own respond to that designator'));
+        return;
+      }
+      const delta = fromPosition > toPosition ? 1 : -1;
+      event.rules.forEach((part) => {
+        if (part.position === fromPosition) {
+          part.position = toPosition;
+        } else if (isBetween(part.position, fromPosition, toPosition)) {
+          part.position += delta;
+        }
+      });
+
+      event.save((error) => {
+        if (error) {
+          rej(error);
+          return;
+        }
+        res(event);
+      });
+    });
+  });
+};
 
 const mutation = {
   reorderRules: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default mutation
+export default mutation;
diff --git a/server/src/schema/mutations/index.js b/server/src/schema/mutations/index.js
index a49ba5114..ffefe7dcf 100644
--- a/server/src/schema/mutations/index.js
+++ b/server/src/schema/mutations/index.js
@@ -1,20 +1,20 @@
 import {
-  GraphQLObjectType
-} from 'graphql'
+  GraphQLObjectType,
+} from 'graphql';
 
-import HostEventMutation from './HostEvent'
-import EditEventMutation from './EditEvent'
-import RegisterToEventMutation from './RegisterToEvent'
-import EditParticipantMutation from './EditParticipant'
-import AddRuleMutation from './AddRule'
-import EditRuleMutation from './EditRule'
-import ReorderRulesMutation from './ReorderRules'
-import AddPrizeMutation from './AddPrize'
-import EditPrizeMutation from './EditPrize'
-import CreateFormulaMutation from './CreateFormula'
-import CreateAndSetFormulaMutation from './CreateAndSetFormula'
-import CreatePlotterMutation from './CreatePlotter'
-import CreateAndSetPlotterMutation from './CreateAndSetPlotter'
+import HostEventMutation from './HostEvent';
+import EditEventMutation from './EditEvent';
+import RegisterToEventMutation from './RegisterToEvent';
+import EditParticipantMutation from './EditParticipant';
+import AddRuleMutation from './AddRule';
+import EditRuleMutation from './EditRule';
+import ReorderRulesMutation from './ReorderRules';
+import AddPrizeMutation from './AddPrize';
+import EditPrizeMutation from './EditPrize';
+import CreateFormulaMutation from './CreateFormula';
+import CreateAndSetFormulaMutation from './CreateAndSetFormula';
+import CreatePlotterMutation from './CreatePlotter';
+import CreateAndSetPlotterMutation from './CreateAndSetPlotter';
 
 const Mutation = new GraphQLObjectType({
   name: 'Mutation',
@@ -31,8 +31,8 @@ const Mutation = new GraphQLObjectType({
     CreateFormulaMutation,
     CreateAndSetFormulaMutation,
     CreatePlotterMutation,
-    CreateAndSetPlotterMutation
-  )
-})
+    CreateAndSetPlotterMutation,
+  ),
+});
 
-export default Mutation
+export default Mutation;
diff --git a/server/src/schema/queries/Event.js b/server/src/schema/queries/Event.js
index 64eee0855..c35d48f47 100644
--- a/server/src/schema/queries/Event.js
+++ b/server/src/schema/queries/Event.js
@@ -1,35 +1,35 @@
 import {
   GraphQLNonNull,
-  GraphQLID
-} from 'graphql'
-import { DatabaseError } from '../../errors'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  GraphQLID,
+} from 'graphql';
+import { DatabaseError } from '../../errors';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
-  designator: { type: new GraphQLNonNull(GraphQLID) }
-}
+  designator: { type: new GraphQLNonNull(GraphQLID) },
+};
 
-const resolve = (parent, { designator }, context) => {
-  return new Promise((resolve, reject) => {
-    Event.findOne({ designator }).exec((err, event) => {
-      if (err) {
-        reject(err)
-      } else if (!event) {
-        reject(new DatabaseError('None of the events respond to that designator'))
-      } else {
-        resolve(event)
-      }
-    })
-  })
-}
+const resolve = (parent, { designator }) => new Promise((res, rej) => {
+  Event.findOne({ designator }).exec((err, event) => {
+    if (err) {
+      rej(err);
+      return;
+    }
+    if (!event) {
+      rej(new DatabaseError('None of the events respond to that designator'));
+      return;
+    }
+    res(event);
+  });
+});
 
 const query = {
   event: {
     type: EventType,
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default query
+export default query;
diff --git a/server/src/schema/queries/Events.js b/server/src/schema/queries/Events.js
index 636988ac4..c5b1b5e9f 100644
--- a/server/src/schema/queries/Events.js
+++ b/server/src/schema/queries/Events.js
@@ -1,35 +1,35 @@
 import {
   GraphQLInt,
-  GraphQLList
-} from 'graphql'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  GraphQLList,
+} from 'graphql';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   minDate: { type: GraphQLInt },
-  maxDate: { type: GraphQLInt }
-}
+  maxDate: { type: GraphQLInt },
+};
 
-const resolve = (parent, { minDate, maxDate }, context) => {
-  return Event.find(
-    Object.assign(
-      minDate || maxDate
-        ? { startDatetime:
+const resolve = (parent, { minDate, maxDate }) => Event.find(
+  Object.assign(
+    minDate || maxDate
+      ? {
+        startDatetime:
           Object.assign(
             minDate ? { $gte: minDate } : {},
-            maxDate ? { $lte: maxDate } : {}
-          ) }
-        : {}
-    )
-  )
-}
+            maxDate ? { $lte: maxDate } : {},
+          ),
+      }
+      : {},
+  ),
+);
 
 const query = {
   events: {
     type: new GraphQLList(EventType),
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default query
+export default query;
diff --git a/server/src/schema/queries/EventsByHost.js b/server/src/schema/queries/EventsByHost.js
index 8a6d35848..ac4975f40 100644
--- a/server/src/schema/queries/EventsByHost.js
+++ b/server/src/schema/queries/EventsByHost.js
@@ -1,38 +1,38 @@
 import {
   GraphQLInt,
   GraphQLList,
-  GraphQLString
-} from 'graphql'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  GraphQLString,
+} from 'graphql';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   hostId: { type: GraphQLString },
   minDate: { type: GraphQLInt },
-  maxDate: { type: GraphQLInt }
-}
+  maxDate: { type: GraphQLInt },
+};
 
-const resolve = (parent, { hostId, minDate, maxDate }, context) => {
-  return Event.find(
-    Object.assign(
-      hostId ? { hostId } : { hostId: context.userId },
-      minDate || maxDate
-        ? { startDatetime:
+const resolve = (parent, { hostId, minDate, maxDate }, context) => Event.find(
+  Object.assign(
+    hostId ? { hostId } : { hostId: context.userId },
+    minDate || maxDate
+      ? {
+        startDatetime:
           Object.assign(
             minDate ? { $gte: minDate } : {},
-            maxDate ? { $lte: maxDate } : {}
-          ) }
-        : {}
-    )
-  )
-}
+            maxDate ? { $lte: maxDate } : {},
+          ),
+      }
+      : {},
+  ),
+);
 
 const query = {
   eventsByHost: {
     type: new GraphQLList(EventType),
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default query
+export default query;
diff --git a/server/src/schema/queries/EventsByTeam.js b/server/src/schema/queries/EventsByTeam.js
index 8c28391d7..10a914288 100644
--- a/server/src/schema/queries/EventsByTeam.js
+++ b/server/src/schema/queries/EventsByTeam.js
@@ -2,38 +2,38 @@ import {
   GraphQLInt,
   GraphQLList,
   GraphQLString,
-  GraphQLNonNull
-} from 'graphql'
-import { EventType } from '../types'
-import { Event } from '../../models'
+  GraphQLNonNull,
+} from 'graphql';
+import { EventType } from '../types';
+import { Event } from '../../models';
 
 const args = {
   teamId: { type: new GraphQLNonNull(GraphQLString) },
   minDate: { type: GraphQLInt },
-  maxDate: { type: GraphQLInt }
-}
+  maxDate: { type: GraphQLInt },
+};
 
-const resolve = (parent, { teamId, minDate, maxDate }, context) => {
-  return Event.find(
-    Object.assign(
-      { participants: { $elemMatch: { teamId } } },
-      minDate || maxDate
-        ? { startDatetime:
+const resolve = (parent, { teamId, minDate, maxDate }) => Event.find(
+  Object.assign(
+    { participants: { $elemMatch: { teamId } } },
+    minDate || maxDate
+      ? {
+        startDatetime:
           Object.assign(
             minDate ? { $gte: minDate } : {},
-            maxDate ? { $lte: maxDate } : {}
-          ) }
-        : {}
-    )
-  )
-}
+            maxDate ? { $lte: maxDate } : {},
+          ),
+      }
+      : {},
+  ),
+);
 
 const query = {
   eventsByTeam: {
     type: new GraphQLList(EventType),
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default query
+export default query;
diff --git a/server/src/schema/queries/Formulas.js b/server/src/schema/queries/Formulas.js
index 158fcf853..390587fdc 100644
--- a/server/src/schema/queries/Formulas.js
+++ b/server/src/schema/queries/Formulas.js
@@ -1,21 +1,19 @@
 import {
-  GraphQLList
-} from 'graphql'
-import { FormulaType } from '../types'
-import { Formula } from '../../models'
+  GraphQLList,
+} from 'graphql';
+import { FormulaType } from '../types';
+import { Formula } from '../../models';
 
-const args = {}
+const args = {};
 
-const resolve = (parent, args, context) => {
-  return Formula.find()
-}
+const resolve = () => Formula.find();
 
 const query = {
   formulas: {
     type: new GraphQLList(FormulaType),
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default query
+export default query;
diff --git a/server/src/schema/queries/Plotters.js b/server/src/schema/queries/Plotters.js
index 9bdc46296..b927041f0 100644
--- a/server/src/schema/queries/Plotters.js
+++ b/server/src/schema/queries/Plotters.js
@@ -1,21 +1,19 @@
 import {
-  GraphQLList
-} from 'graphql'
-import { PlotterType } from '../types'
-import { Plotter } from '../../models'
+  GraphQLList,
+} from 'graphql';
+import { PlotterType } from '../types';
+import { Plotter } from '../../models';
 
-const args = {}
+const args = {};
 
-const resolve = (parent, args, context) => {
-  return Plotter.find()
-}
+const resolve = () => Plotter.find();
 
 const query = {
   plotters: {
     type: new GraphQLList(PlotterType),
     args,
-    resolve
-  }
-}
+    resolve,
+  },
+};
 
-export default query
+export default query;
diff --git a/server/src/schema/queries/index.js b/server/src/schema/queries/index.js
index 5d67c43bb..1daa62ea1 100644
--- a/server/src/schema/queries/index.js
+++ b/server/src/schema/queries/index.js
@@ -1,13 +1,13 @@
 import {
-  GraphQLObjectType
-} from 'graphql'
+  GraphQLObjectType,
+} from 'graphql';
 
-import EventQuery from './Event'
-import EventsQuery from './Events'
-import EventsByHostQuery from './EventsByHost'
-import EventsByTeamQuery from './EventsByTeam'
-import FormulasQuery from './Formulas'
-import PlottersQuery from './Plotters'
+import EventQuery from './Event';
+import EventsQuery from './Events';
+import EventsByHostQuery from './EventsByHost';
+import EventsByTeamQuery from './EventsByTeam';
+import FormulasQuery from './Formulas';
+import PlottersQuery from './Plotters';
 
 const RootQuery = new GraphQLObjectType({
   name: 'RootQueryType',
@@ -17,8 +17,8 @@ const RootQuery = new GraphQLObjectType({
     EventsByHostQuery,
     EventsByTeamQuery,
     FormulasQuery,
-    PlottersQuery
-  )
-})
+    PlottersQuery,
+  ),
+});
 
-export default RootQuery
+export default RootQuery;
diff --git a/server/src/schema/types/AdditionalPrize.js b/server/src/schema/types/AdditionalPrize.js
index f78c24d13..ee3a791ff 100644
--- a/server/src/schema/types/AdditionalPrize.js
+++ b/server/src/schema/types/AdditionalPrize.js
@@ -1,16 +1,16 @@
 import {
   GraphQLObjectType,
   GraphQLString,
-  GraphQLInt
-} from 'graphql'
+  GraphQLInt,
+} from 'graphql';
 
 const AdditionalPrizeType = new GraphQLObjectType({
   name: 'OtherPrize',
   fields: () => ({
     condition: { type: GraphQLString },
     amount: { type: GraphQLInt },
-    asset: { type: GraphQLString }
-  })
-})
+    asset: { type: GraphQLString },
+  }),
+});
 
-export default AdditionalPrizeType
+export default AdditionalPrizeType;
diff --git a/server/src/schema/types/Event.js b/server/src/schema/types/Event.js
index 1bb76b3a6..7917e3032 100644
--- a/server/src/schema/types/Event.js
+++ b/server/src/schema/types/Event.js
@@ -3,15 +3,15 @@ import {
   GraphQLInt,
   GraphQLString,
   GraphQLList,
-  GraphQLID
-} from 'graphql'
+  GraphQLID,
+} from 'graphql';
 import {
   FormulaType,
   PlotterType,
   RuleType,
   ParticipantType,
-  PrizeType
-} from './index'
+  PrizeType,
+} from './index';
 
 const EventType = new GraphQLObjectType({
   name: 'Event',
@@ -24,35 +24,35 @@ const EventType = new GraphQLObjectType({
     finishDatetime: { type: GraphQLInt },
     formula: {
       type: FormulaType,
-      resolve (parent, args) {
-        return parent.formula
-      }
+      resolve(parent) {
+        return parent.formula;
+      },
     },
     plotter: {
       type: PlotterType,
-      resolve (parent, args) {
-        return parent.plotter
-      }
+      resolve(parent) {
+        return parent.plotter;
+      },
     },
     rules: {
       type: new GraphQLList(RuleType),
-      resolve (parent, args) {
-        return parent.rules
-      }
+      resolve(parent) {
+        return parent.rules;
+      },
     },
     participants: {
       type: new GraphQLList(ParticipantType),
-      resolve (parent, args) {
-        return parent.participants
-      }
+      resolve(parent) {
+        return parent.participants;
+      },
     },
     prizes: {
       type: new GraphQLList(PrizeType),
-      resolve (parent, args) {
-        return parent.prizes
-      }
-    }
-  })
-})
+      resolve(parent) {
+        return parent.prizes;
+      },
+    },
+  }),
+});
 
-export default EventType
+export default EventType;
diff --git a/server/src/schema/types/Formula.js b/server/src/schema/types/Formula.js
index b081cae14..f5d312327 100644
--- a/server/src/schema/types/Formula.js
+++ b/server/src/schema/types/Formula.js
@@ -1,8 +1,8 @@
 import {
   GraphQLObjectType,
   GraphQLString,
-  GraphQLBoolean
-} from 'graphql'
+  GraphQLBoolean,
+} from 'graphql';
 
 const FormulaType = new GraphQLObjectType({
   name: 'Formula',
@@ -10,8 +10,8 @@ const FormulaType = new GraphQLObjectType({
     id: { type: GraphQLString },
     ownerId: { type: GraphQLString },
     isTemplate: { type: GraphQLBoolean },
-    name: { type: GraphQLString }
-  })
-})
+    name: { type: GraphQLString },
+  }),
+});
 
-export default FormulaType
+export default FormulaType;
diff --git a/server/src/schema/types/Participant.js b/server/src/schema/types/Participant.js
index 038c30a07..f3afb7745 100644
--- a/server/src/schema/types/Participant.js
+++ b/server/src/schema/types/Participant.js
@@ -1,15 +1,15 @@
 import {
   GraphQLObjectType,
-  GraphQLString
-} from 'graphql'
+  GraphQLString,
+} from 'graphql';
 
 const ParticipantType = new GraphQLObjectType({
   name: 'Participant',
   fields: () => ({
     teamId: { type: GraphQLString },
     botId: { type: GraphQLString },
-    releaseId: { type: GraphQLString }
-  })
-})
+    releaseId: { type: GraphQLString },
+  }),
+});
 
-export default ParticipantType
+export default ParticipantType;
diff --git a/server/src/schema/types/Plotter.js b/server/src/schema/types/Plotter.js
index 610870eb6..9e86390a5 100644
--- a/server/src/schema/types/Plotter.js
+++ b/server/src/schema/types/Plotter.js
@@ -1,8 +1,8 @@
 import {
   GraphQLObjectType,
   GraphQLString,
-  GraphQLBoolean
-} from 'graphql'
+  GraphQLBoolean,
+} from 'graphql';
 
 const PlotterType = new GraphQLObjectType({
   name: 'Plotter',
@@ -13,8 +13,8 @@ const PlotterType = new GraphQLObjectType({
     name: { type: GraphQLString },
     host: { type: GraphQLString },
     repo: { type: GraphQLString },
-    moduleName: { type: GraphQLString }
-  })
-})
+    moduleName: { type: GraphQLString },
+  }),
+});
 
-export default PlotterType
+export default PlotterType;
diff --git a/server/src/schema/types/Prize.js b/server/src/schema/types/Prize.js
index aa0cabc38..4b2fc8aba 100644
--- a/server/src/schema/types/Prize.js
+++ b/server/src/schema/types/Prize.js
@@ -1,9 +1,9 @@
 import {
   GraphQLObjectType,
   GraphQLList,
-  GraphQLInt
-} from 'graphql'
-import { AdditionalPrizeType } from './index'
+  GraphQLInt,
+} from 'graphql';
+import { AdditionalPrizeType } from './index';
 
 const PrizeType = new GraphQLObjectType({
   name: 'Prize',
@@ -12,11 +12,11 @@ const PrizeType = new GraphQLObjectType({
     amount: { type: GraphQLInt },
     additional: {
       type: new GraphQLList(AdditionalPrizeType),
-      resolve (parent, args) {
-        return parent.additional
-      }
-    }
-  })
-})
+      resolve(parent) {
+        return parent.additional;
+      },
+    },
+  }),
+});
 
-export default PrizeType
+export default PrizeType;
diff --git a/server/src/schema/types/Rule.js b/server/src/schema/types/Rule.js
index b9a5d59ca..e39a877fc 100644
--- a/server/src/schema/types/Rule.js
+++ b/server/src/schema/types/Rule.js
@@ -1,16 +1,16 @@
 import {
   GraphQLObjectType,
   GraphQLInt,
-  GraphQLString
-} from 'graphql'
+  GraphQLString,
+} from 'graphql';
 
 const RuleType = new GraphQLObjectType({
   name: 'Rule',
   fields: () => ({
     position: { type: GraphQLInt },
     title: { type: GraphQLString },
-    description: { type: GraphQLString }
-  })
-})
+    description: { type: GraphQLString },
+  }),
+});
 
-export default RuleType
+export default RuleType;
diff --git a/server/src/schema/types/index.js b/server/src/schema/types/index.js
index be64a7f25..a96f2f4db 100644
--- a/server/src/schema/types/index.js
+++ b/server/src/schema/types/index.js
@@ -1,10 +1,10 @@
-import PlotterType from './Plotter'
-import RuleType from './Rule'
-import ParticipantType from './Participant'
-import AdditionalPrizeType from './AdditionalPrize'
-import PrizeType from './Prize'
-import FormulaType from './Formula'
-import EventType from './Event'
+import PlotterType from './Plotter';
+import RuleType from './Rule';
+import ParticipantType from './Participant';
+import AdditionalPrizeType from './AdditionalPrize';
+import PrizeType from './Prize';
+import FormulaType from './Formula';
+import EventType from './Event';
 
 export {
   PlotterType,
@@ -13,5 +13,5 @@ export {
   AdditionalPrizeType,
   PrizeType,
   FormulaType,
-  EventType
-}
+  EventType,
+};
diff --git a/server/src/utils/functions.js b/server/src/utils/functions.js
index 0963b4b45..c37b1d87e 100644
--- a/server/src/utils/functions.js
+++ b/server/src/utils/functions.js
@@ -1,26 +1,19 @@
-export const capitalize = (string) => {
-  return (string).charAt(0).toUpperCase() + (string).slice(1)
-}
+export const capitalize = string => (string).charAt(0).toUpperCase() + (string).slice(1);
 
-export const slugify = (text) => {
-  return text.toString().toLowerCase()
-    .replace(/\s+/g, '-')
-    .replace(/[^\w\-]+/g, '')
-    .replace(/\-\-+/g, '-')
-    .replace(/^-+/, '')
-    .replace(/-+$/, '')
-}
+export const slugify = text => text.toString().toLowerCase()
+  .replace(/\s+/g, '-')
+  .replace(/[^\w-]+/g, '')
+  .replace(/--+/g, '-')
+  .replace(/^-+/, '')
+  .replace(/-+$/, '');
 
-export const epoch = () => {
-  return Math.round(new Date().getTime() / 1000)
-}
+export const epoch = () => Math.round(new Date().getTime() / 1000);
 
 export const isBetween = (value, valA, valB) => {
-  const min = valA < valB ? valA : valB
-  const max = valA > valB ? valA : valB
+  const min = valA < valB ? valA : valB;
+  const max = valA > valB ? valA : valB;
   if (value >= min && value <= max) {
-    return true
-  } else {
-    return false
+    return true;
   }
-}
+  return false;
+};