diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..c80a056
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,20 @@
+{
+  "parserOptions": {
+    "ecmaVersion": 2019,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "jsx": true
+    }
+  },
+  "rules": {
+    "strict": ["error", "never"],
+    "valid-typeof": "error",
+    "no-unsafe-negation": "error",
+    "no-unused-vars": "error",
+    "no-unexpected-multiline": "error",
+    "no-undef": "error"
+  },
+  "env": {
+    "browser": true
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index 96f48f2..28b90d4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -846,6 +846,45 @@
         "to-fast-properties": "^2.0.0"
       }
     },
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
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+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
+      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.10.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
+      "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"
+      }
+    },
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+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.2.1.tgz",
+      "integrity": "sha512-Cg3ymMAdN10wOk/VYfLV7KCQyv7EDirJ64500sU7n9UlmioEtDuU5Gd+hj73hXSU/ex7tHJSssmyftDdkMLO8Q==",
+      "dev": true,
+      "requires": {
+        "type-fest": "^0.5.2"
+      }
+    },
+    "ansi-regex": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+      "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+      "dev": true
+    },
     "ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
@@ -878,6 +917,15 @@
         }
       }
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+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -913,6 +961,12 @@
       "dev": true,
       "optional": true
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
+    },
     "async-each": {
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       "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
@@ -1079,6 +1133,12 @@
         "unset-value": "^1.0.0"
       }
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+    "callsites": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001008.tgz",
@@ -1096,6 +1156,12 @@
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       }
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+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
@@ -1142,6 +1208,21 @@
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+    "cli-cursor": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^3.1.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "dev": true
+    },
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@@ -1228,6 +1309,19 @@
       "dev": true,
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+    "cross-spawn": {
+      "version": "6.0.5",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
+      "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
+      "dev": true,
+      "requires": {
+        "nice-try": "^1.0.4",
+        "path-key": "^2.0.1",
+        "semver": "^5.5.0",
+        "shebang-command": "^1.2.0",
+        "which": "^1.2.9"
+      }
+    },
     "debug": {
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       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -1245,6 +1339,12 @@
       "dev": true,
       "optional": 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
+    },
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       "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
@@ -1299,18 +1399,176 @@
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       }
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+    "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"
+      }
+    },
     "electron-to-chromium": {
       "version": "1.3.306",
       "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.306.tgz",
       "integrity": "sha512-frDqXvrIROoYvikSKTIKbHbzO6M3/qC6kCIt/1FOa9kALe++c4VAJnwjSFvf1tYLEUsP2n9XZ4XSCyqc3l7A/A==",
       "dev": true
     },
+    "emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
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+      "dev": true
+    },
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       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
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+    "eslint": {
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+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.6.0.tgz",
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+        "chalk": "^2.1.0",
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+        "eslint-scope": "^5.0.0",
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+        "eslint-visitor-keys": "^1.1.0",
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+        "esquery": "^1.0.1",
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+        "inquirer": "^7.0.0",
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+        "js-yaml": "^3.13.1",
+        "json-stable-stringify-without-jsonify": "^1.0.1",
+        "levn": "^0.3.0",
+        "lodash": "^4.17.14",
+        "minimatch": "^3.0.4",
+        "mkdirp": "^0.5.1",
+        "natural-compare": "^1.4.0",
+        "optionator": "^0.8.2",
+        "progress": "^2.0.0",
+        "regexpp": "^2.0.1",
+        "semver": "^6.1.2",
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+        "strip-json-comments": "^3.0.1",
+        "table": "^5.2.3",
+        "text-table": "^0.2.0",
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+      "dev": true,
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+        "acorn-jsx": "^5.1.0",
+        "eslint-visitor-keys": "^1.1.0"
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+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
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+      "resolved": "https://registry.npmjs.org/esquery/-/esquery-1.0.1.tgz",
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+      "dev": true,
+      "requires": {
+        "estraverse": "^4.0.0"
+      }
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+    "esrecurse": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.2.1.tgz",
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+      "dev": true,
+      "requires": {
+        "estraverse": "^4.1.0"
+      }
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+      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.3.0.tgz",
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@@ -1378,6 +1636,17 @@
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+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/external-editor/-/external-editor-3.1.0.tgz",
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+      "dev": true,
+      "requires": {
+        "chardet": "^0.7.0",
+        "iconv-lite": "^0.4.24",
+        "tmp": "^0.0.33"
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       "resolved": "https://registry.npmjs.org/extglob/-/extglob-2.0.4.tgz",
@@ -1449,6 +1718,42 @@
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+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz",
+      "integrity": "sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=",
+      "dev": true
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+    "fast-json-stable-stringify": {
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+      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz",
+      "integrity": "sha1-1RQsDK7msRifh9OnYREGT4bIu/I=",
+      "dev": true
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+    "fast-levenshtein": {
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+      "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
+      "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
+      "dev": true
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+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/figures/-/figures-3.1.0.tgz",
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+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-5.0.1.tgz",
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+      "dev": true,
+      "requires": {
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+      }
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@@ -1474,6 +1779,23 @@
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+      "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-2.0.1.tgz",
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+      "dev": true,
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+        "rimraf": "2.6.3",
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@@ -2057,6 +2379,12 @@
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       "dev": true
     },
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       "resolved": "https://registry.npmjs.org/snapdragon/-/snapdragon-0.8.2.tgz",
@@ -3023,6 +3649,12 @@
         "extend-shallow": "^3.0.0"
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+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
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@@ -3046,6 +3678,28 @@
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+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
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+      "dev": true,
+      "requires": {
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+        "is-fullwidth-code-point": "^3.0.0",
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
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+          "dev": true,
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@@ -3056,6 +3710,29 @@
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+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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+      "dev": true,
+      "requires": {
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+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        }
+      }
+    },
+    "strip-json-comments": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.0.1.tgz",
+      "integrity": "sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -3065,6 +3742,64 @@
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       }
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+    "table": {
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
+        "slice-ansi": "^2.1.0",
+        "string-width": "^3.0.0"
+      },
+      "dependencies": {
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        }
+      }
+    },
+    "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": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "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": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -3117,6 +3852,27 @@
         "repeat-string": "^1.6.1"
       }
     },
+    "tslib": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "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-fest": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.5.2.tgz",
+      "integrity": "sha512-DWkS49EQKVX//Tbupb9TFa19c7+MK1XmzkrZUR8TAktmE/DizXoaoJV6TZ/tSIPXipqNiRI6CyAe7x69Jb6RSw==",
+      "dev": true
+    },
     "unicode-canonical-property-names-ecmascript": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
@@ -3209,6 +3965,15 @@
       "dev": true,
       "optional": true
     },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "urix": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
@@ -3230,11 +3995,41 @@
       "dev": true,
       "optional": true
     },
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
+    },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
+    },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 2db0e5f..5957b0f 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
   "devDependencies": {
     "@babel/cli": "^7.7.0",
     "@babel/core": "^7.7.2",
-    "@babel/preset-env": "^7.7.1"
+    "@babel/preset-env": "^7.7.1",
+    "eslint": "^6.6.0"
   }
 }