diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..c28e3e5
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,38 @@
+{
+    "env": {
+        "node": true,
+        "es6": true,
+        "mocha": true
+    },
+    "extends": "eslint:recommended",
+    "globals": {
+        "Atomics": "readonly",
+        "SharedArrayBuffer": "readonly"
+    },
+    "parserOptions": {
+        "ecmaVersion": 2018
+    },
+    "rules": {
+        "indent": [
+            "error",
+            2
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "quotes": [
+            "error",
+            "single"
+        ],
+        "semi": [
+            "error",
+            "never"
+        ],
+        "object-curly-spacing": [
+          "error",
+          "always"
+        ],
+        "require-await": "error"
+    }
+}
diff --git a/package-lock.json b/package-lock.json
index c4e6ebf..c36dc44 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,6 +43,15 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.12.tgz",
       "integrity": "sha512-QcAKpaO6nhHLlxWBvpc4WeLrTvPqlHOvaj0s5GriKkA1zq+bsFBPpfYCvQhLqLgYlIko8A9YrPdaMHCo5mBcpg=="
     },
+    "JSONStream": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz",
+      "integrity": "sha512-E+iruNOY8VV9s4JEbe1aNEm6MiszPRr/UfcHMz0TQh1BXSxHK+ASV1R6W4HpjBhSeS+54PIsAMCBmwD06LLsqQ==",
+      "requires": {
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
+      }
+    },
     "accepts": {
       "version": "1.3.7",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
@@ -57,11 +66,32 @@
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.0.tgz",
       "integrity": "sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw=="
     },
+    "acorn-dynamic-import": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz",
+      "integrity": "sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw=="
+    },
     "acorn-jsx": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
       "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg=="
     },
+    "acorn-node": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/acorn-node/-/acorn-node-1.7.0.tgz",
+      "integrity": "sha512-XhahLSsCB6X6CJbe+uNu3Mn9sJBNFxtBN9NLgAOQovfS6Kh0lDUtmlclhjn9CvEK7A7YyRU13PXlNcpSiLI9Yw==",
+      "requires": {
+        "acorn": "^6.1.1",
+        "acorn-dynamic-import": "^4.0.0",
+        "acorn-walk": "^6.1.1",
+        "xtend": "^4.0.1"
+      }
+    },
+    "acorn-walk": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.2.0.tgz",
+      "integrity": "sha512-7evsyfH1cLOCdAzZAd43Cic04yKydNx0cF+7tiA19p1XnLLPU4dpCQOqpjqwokFe//vS0QqfqqjCS2JkiIs0cA=="
+    },
     "aes-js": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.0.0.tgz",
@@ -193,6 +223,11 @@
       "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
       "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8="
     },
+    "array-filter": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-0.0.1.tgz",
+      "integrity": "sha1-fajPLiZijtcygDWB/SH2fKzS7uw="
+    },
     "array-flatten": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
@@ -229,6 +264,16 @@
         }
       }
     },
+    "array-map": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/array-map/-/array-map-0.0.0.tgz",
+      "integrity": "sha1-iKK6tz0c97zVwbEYoAP2b2ZfpmI="
+    },
+    "array-reduce": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/array-reduce/-/array-reduce-0.0.0.tgz",
+      "integrity": "sha1-FziZ0//Rx9k4PkR5Ul2+J4yrXys="
+    },
     "array-slice": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
@@ -274,6 +319,30 @@
         "minimalistic-assert": "^1.0.0"
       }
     },
+    "assert": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/assert/-/assert-1.5.0.tgz",
+      "integrity": "sha512-EDsgawzwoun2CZkCgtxJbv392v4nbk9XDD06zI+kQYoBM/3RBWLlEyJARDOmhAAosBjWACEkKL6S+lIZtcAubA==",
+      "requires": {
+        "object-assign": "^4.1.1",
+        "util": "0.10.3"
+      },
+      "dependencies": {
+        "inherits": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
+          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE="
+        },
+        "util": {
+          "version": "0.10.3",
+          "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
+          "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+          "requires": {
+            "inherits": "2.0.1"
+          }
+        }
+      }
+    },
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
@@ -590,11 +659,106 @@
       "resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
       "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8="
     },
+    "browser-pack": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/browser-pack/-/browser-pack-6.1.0.tgz",
+      "integrity": "sha512-erYug8XoqzU3IfcU8fUgyHqyOXqIE4tUTTQ+7mqUjQlvnXkOO6OlT9c/ZoJVHYoAaqGxr09CN53G7XIsO4KtWA==",
+      "requires": {
+        "JSONStream": "^1.0.3",
+        "combine-source-map": "~0.8.0",
+        "defined": "^1.0.0",
+        "safe-buffer": "^5.1.1",
+        "through2": "^2.0.0",
+        "umd": "^3.0.0"
+      }
+    },
+    "browser-resolve": {
+      "version": "1.11.3",
+      "resolved": "https://registry.npmjs.org/browser-resolve/-/browser-resolve-1.11.3.tgz",
+      "integrity": "sha512-exDi1BYWB/6raKHmDTCicQfTkqwN5fioMFV4j8BsfMU4R2DK/QfZfK7kOVkmWCNANf0snkBzqGqAJBao9gZMdQ==",
+      "requires": {
+        "resolve": "1.1.7"
+      },
+      "dependencies": {
+        "resolve": {
+          "version": "1.1.7",
+          "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz",
+          "integrity": "sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs="
+        }
+      }
+    },
     "browser-stdout": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
       "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw=="
     },
+    "browserify": {
+      "version": "16.3.0",
+      "resolved": "https://registry.npmjs.org/browserify/-/browserify-16.3.0.tgz",
+      "integrity": "sha512-BWaaD7alyGZVEBBwSTYx4iJF5DswIGzK17o8ai9w4iKRbYpk3EOiprRHMRRA8DCZFmFeOdx7A385w2XdFvxWmg==",
+      "requires": {
+        "JSONStream": "^1.0.3",
+        "assert": "^1.4.0",
+        "browser-pack": "^6.0.1",
+        "browser-resolve": "^1.11.0",
+        "browserify-zlib": "~0.2.0",
+        "buffer": "^5.0.2",
+        "cached-path-relative": "^1.0.0",
+        "concat-stream": "^1.6.0",
+        "console-browserify": "^1.1.0",
+        "constants-browserify": "~1.0.0",
+        "crypto-browserify": "^3.0.0",
+        "defined": "^1.0.0",
+        "deps-sort": "^2.0.0",
+        "domain-browser": "^1.2.0",
+        "duplexer2": "~0.1.2",
+        "events": "^2.0.0",
+        "glob": "^7.1.0",
+        "has": "^1.0.0",
+        "htmlescape": "^1.1.0",
+        "https-browserify": "^1.0.0",
+        "inherits": "~2.0.1",
+        "insert-module-globals": "^7.0.0",
+        "labeled-stream-splicer": "^2.0.0",
+        "mkdirp": "^0.5.0",
+        "module-deps": "^6.0.0",
+        "os-browserify": "~0.3.0",
+        "parents": "^1.0.1",
+        "path-browserify": "~0.0.0",
+        "process": "~0.11.0",
+        "punycode": "^1.3.2",
+        "querystring-es3": "~0.2.0",
+        "read-only-stream": "^2.0.0",
+        "readable-stream": "^2.0.2",
+        "resolve": "^1.1.4",
+        "shasum": "^1.0.0",
+        "shell-quote": "^1.6.1",
+        "stream-browserify": "^2.0.0",
+        "stream-http": "^2.0.0",
+        "string_decoder": "^1.1.1",
+        "subarg": "^1.0.0",
+        "syntax-error": "^1.1.1",
+        "through2": "^2.0.0",
+        "timers-browserify": "^1.0.1",
+        "tty-browserify": "0.0.1",
+        "url": "~0.11.0",
+        "util": "~0.10.1",
+        "vm-browserify": "^1.0.0",
+        "xtend": "^4.0.0"
+      },
+      "dependencies": {
+        "process": {
+          "version": "0.11.10",
+          "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
+          "integrity": "sha1-czIwDoQBYb2j5podHZGn1LwW8YI="
+        },
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4="
+        }
+      }
+    },
     "browserify-aes": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
@@ -668,6 +832,14 @@
         "parse-asn1": "^5.0.0"
       }
     },
+    "browserify-zlib": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/browserify-zlib/-/browserify-zlib-0.2.0.tgz",
+      "integrity": "sha512-Z942RysHXmJrhqk88FmKBVq/v5tqmSkDz7p54G/MGyjMnCFFnC79XWNbg+Vta8W6Wb2qtSZTSxIGkJrRpCFEiA==",
+      "requires": {
+        "pako": "~1.0.5"
+      }
+    },
     "buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.2.1.tgz",
@@ -721,6 +893,11 @@
       "resolved": "https://registry.npmjs.org/buffer-xor/-/buffer-xor-1.0.3.tgz",
       "integrity": "sha1-JuYe0UIvtw3ULm42cp7VHYVf6Nk="
     },
+    "builtin-status-codes": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/builtin-status-codes/-/builtin-status-codes-3.0.0.tgz",
+      "integrity": "sha1-hZgoeOIbmOHGZCXgPQF0eI9Wnug="
+    },
     "bytes": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
@@ -742,6 +919,11 @@
         "unset-value": "^1.0.0"
       }
     },
+    "cached-path-relative": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/cached-path-relative/-/cached-path-relative-1.0.2.tgz",
+      "integrity": "sha512-5r2GqsoEb4qMTTN9J+WzXfjov+hjxT+j3u5K+kIVNIwAd99DLCJE9pBIMP1qVeybV6JiijL385Oz0DcYxfbOIg=="
+    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -855,6 +1037,16 @@
         "web3": "^1.0.0-beta.55"
       },
       "dependencies": {
+        "espree": {
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.1.tgz",
+          "integrity": "sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==",
+          "requires": {
+            "acorn": "^6.0.7",
+            "acorn-jsx": "^5.0.0",
+            "eslint-visitor-keys": "^1.0.0"
+          }
+        },
         "snarkjs": {
           "version": "0.1.11",
           "resolved": "https://registry.npmjs.org/snarkjs/-/snarkjs-0.1.11.tgz",
@@ -865,6 +1057,51 @@
             "escape-string-regexp": "^1.0.5",
             "eslint": "^5.3.0",
             "yargs": "^12.0.2"
+          },
+          "dependencies": {
+            "eslint": {
+              "version": "5.16.0",
+              "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
+              "integrity": "sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==",
+              "requires": {
+                "@babel/code-frame": "^7.0.0",
+                "ajv": "^6.9.1",
+                "chalk": "^2.1.0",
+                "cross-spawn": "^6.0.5",
+                "debug": "^4.0.1",
+                "doctrine": "^3.0.0",
+                "eslint-scope": "^4.0.3",
+                "eslint-utils": "^1.3.1",
+                "eslint-visitor-keys": "^1.0.0",
+                "espree": "^5.0.1",
+                "esquery": "^1.0.1",
+                "esutils": "^2.0.2",
+                "file-entry-cache": "^5.0.1",
+                "functional-red-black-tree": "^1.0.1",
+                "glob": "^7.1.2",
+                "globals": "^11.7.0",
+                "ignore": "^4.0.6",
+                "import-fresh": "^3.0.0",
+                "imurmurhash": "^0.1.4",
+                "inquirer": "^6.2.2",
+                "js-yaml": "^3.13.0",
+                "json-stable-stringify-without-jsonify": "^1.0.1",
+                "levn": "^0.3.0",
+                "lodash": "^4.17.11",
+                "minimatch": "^3.0.4",
+                "mkdirp": "^0.5.1",
+                "natural-compare": "^1.4.0",
+                "optionator": "^0.8.2",
+                "path-is-inside": "^1.0.2",
+                "progress": "^2.0.0",
+                "regexpp": "^2.0.1",
+                "semver": "^5.5.1",
+                "strip-ansi": "^4.0.0",
+                "strip-json-comments": "^2.0.1",
+                "table": "^5.2.3",
+                "text-table": "^0.2.0"
+              }
+            }
           }
         },
         "web3": {
@@ -1013,6 +1250,24 @@
       "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
       "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg=="
     },
+    "combine-source-map": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/combine-source-map/-/combine-source-map-0.8.0.tgz",
+      "integrity": "sha1-pY0N8ELBhvz4IqjoAV9UUNLXmos=",
+      "requires": {
+        "convert-source-map": "~1.1.0",
+        "inline-source-map": "~0.6.0",
+        "lodash.memoize": "~3.0.3",
+        "source-map": "~0.5.3"
+      },
+      "dependencies": {
+        "convert-source-map": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.1.3.tgz",
+          "integrity": "sha1-SCnId+n+SbMWHzvzZziI4gRpmGA="
+        }
+      }
+    },
     "combined-stream": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
@@ -1047,6 +1302,19 @@
         "typedarray": "^0.0.6"
       }
     },
+    "console-browserify": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-browserify/-/console-browserify-1.1.0.tgz",
+      "integrity": "sha1-8CQcRXMKn8YyOyBtvzjtx0HQuxA=",
+      "requires": {
+        "date-now": "^0.1.4"
+      }
+    },
+    "constants-browserify": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/constants-browserify/-/constants-browserify-1.0.0.tgz",
+      "integrity": "sha1-wguW2MYXdIqvHBYCF2DNJ/y4y3U="
+    },
     "content-disposition": {
       "version": "0.5.3",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
@@ -1203,6 +1471,11 @@
         "type": "^1.0.1"
       }
     },
+    "dash-ast": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/dash-ast/-/dash-ast-1.0.0.tgz",
+      "integrity": "sha512-Vy4dx7gquTeMcQR/hDkYLGUnwVil6vk4FOOct+djUnHOUWt+zJPJAaRIXaAFkPXtJjvlY7o3rfRu0/3hpnwoUA=="
+    },
     "dashdash": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
@@ -1211,6 +1484,11 @@
         "assert-plus": "^1.0.0"
       }
     },
+    "date-now": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/date-now/-/date-now-0.1.4.tgz",
+      "integrity": "sha1-6vQ5/U1ISK105cx9vvIAZyueNFs="
+    },
     "debug": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
@@ -1396,6 +1674,11 @@
         }
       }
     },
+    "defined": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/defined/-/defined-1.0.0.tgz",
+      "integrity": "sha1-yY2bzvdWdBiOEQlpFRGZ45sfppM="
+    },
     "delayed-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
@@ -1406,6 +1689,17 @@
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
       "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
     },
+    "deps-sort": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/deps-sort/-/deps-sort-2.0.0.tgz",
+      "integrity": "sha1-CRckkC6EZYJg65EHSMzNGvbiH7U=",
+      "requires": {
+        "JSONStream": "^1.0.3",
+        "shasum": "^1.0.0",
+        "subarg": "^1.0.0",
+        "through2": "^2.0.0"
+      }
+    },
     "des.js": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/des.js/-/des.js-1.0.0.tgz",
@@ -1425,6 +1719,23 @@
       "resolved": "https://registry.npmjs.org/detect-file/-/detect-file-1.0.0.tgz",
       "integrity": "sha1-8NZtA2cqglyxtzvbP+YjEMjlUrc="
     },
+    "detective": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/detective/-/detective-5.2.0.tgz",
+      "integrity": "sha512-6SsIx+nUUbuK0EthKjv0zrdnajCCXVYGmbYYiYjFVpzcjwEs/JMDZ8tPRG29J/HhN56t3GJp2cGSWDRjjot8Pg==",
+      "requires": {
+        "acorn-node": "^1.6.1",
+        "defined": "^1.0.0",
+        "minimist": "^1.1.1"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
+        }
+      }
+    },
     "diff": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
@@ -1453,6 +1764,11 @@
       "resolved": "https://registry.npmjs.org/dom-walk/-/dom-walk-0.1.1.tgz",
       "integrity": "sha1-ZyIm3HTI95mtNTB9+TaroRrNYBg="
     },
+    "domain-browser": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/domain-browser/-/domain-browser-1.2.0.tgz",
+      "integrity": "sha512-jnjyiM6eRyZl2H+W8Q/zLMA481hzi0eszAaBUzIVnmYVDBbnLxVNnfu1HgEBvCbL+71FrxMl3E6lpKH7Ge3OXA=="
+    },
     "dotenv": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-8.0.0.tgz",
@@ -1468,6 +1784,14 @@
         "create-hmac": "^1.1.4"
       }
     },
+    "duplexer2": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/duplexer2/-/duplexer2-0.1.4.tgz",
+      "integrity": "sha1-ixLauHjA1p4+eJEFFmKjL8a93ME=",
+      "requires": {
+        "readable-stream": "^2.0.2"
+      }
+    },
     "duplexer3": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/duplexer3/-/duplexer3-0.1.4.tgz",
@@ -1621,12 +1945,12 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
     "eslint": {
-      "version": "5.16.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
-      "integrity": "sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==",
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.0.1.tgz",
+      "integrity": "sha512-DyQRaMmORQ+JsWShYsSg4OPTjY56u1nCjAmICrE8vLWqyLKxhFXOthwMj1SA8xwfrv0CofLNVnqbfyhwCkaO0w==",
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "ajv": "^6.9.1",
+        "ajv": "^6.10.0",
         "chalk": "^2.1.0",
         "cross-spawn": "^6.0.5",
         "debug": "^4.0.1",
@@ -1634,18 +1958,19 @@
         "eslint-scope": "^4.0.3",
         "eslint-utils": "^1.3.1",
         "eslint-visitor-keys": "^1.0.0",
-        "espree": "^5.0.1",
+        "espree": "^6.0.0",
         "esquery": "^1.0.1",
         "esutils": "^2.0.2",
         "file-entry-cache": "^5.0.1",
         "functional-red-black-tree": "^1.0.1",
-        "glob": "^7.1.2",
+        "glob-parent": "^3.1.0",
         "globals": "^11.7.0",
         "ignore": "^4.0.6",
         "import-fresh": "^3.0.0",
         "imurmurhash": "^0.1.4",
         "inquirer": "^6.2.2",
-        "js-yaml": "^3.13.0",
+        "is-glob": "^4.0.0",
+        "js-yaml": "^3.13.1",
         "json-stable-stringify-without-jsonify": "^1.0.1",
         "levn": "^0.3.0",
         "lodash": "^4.17.11",
@@ -1653,7 +1978,6 @@
         "mkdirp": "^0.5.1",
         "natural-compare": "^1.4.0",
         "optionator": "^0.8.2",
-        "path-is-inside": "^1.0.2",
         "progress": "^2.0.0",
         "regexpp": "^2.0.1",
         "semver": "^5.5.1",
@@ -1673,9 +1997,12 @@
       }
     },
     "eslint-utils": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.3.1.tgz",
-      "integrity": "sha512-Z7YjnIldX+2XMcjr7ZkgEsOj/bREONV60qYeB/bjMAqqqZ4zxKyWX+BOUkdmRmA9riiIPVvo5x86m5elviOk0Q=="
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.4.0.tgz",
+      "integrity": "sha512-7ehnzPaP5IIEh1r1tkjuIrxqhNkzUJa9z3R92tLJdZIVdWaczEhr3EbhGtsMrVxi1KeR8qA7Off6SWc5WNQqyQ==",
+      "requires": {
+        "eslint-visitor-keys": "^1.0.0"
+      }
     },
     "eslint-visitor-keys": {
       "version": "1.0.0",
@@ -1683,9 +2010,9 @@
       "integrity": "sha512-qzm/XxIbxm/FHyH341ZrbnMUpe+5Bocte9xkmFMzPMjRaZMcXww+MpBptFvtU+79L362nqiLhekCxCxDPaUMBQ=="
     },
     "espree": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.1.tgz",
-      "integrity": "sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-6.0.0.tgz",
+      "integrity": "sha512-lJvCS6YbCn3ImT3yKkPe0+tJ+mH6ljhGNjHQH9mRtiO6gjhVAOhVXW1yjnwqGwTkK3bGbye+hb00nFNmu0l/1Q==",
       "requires": {
         "acorn": "^6.0.7",
         "acorn-jsx": "^5.0.0",
@@ -1844,6 +2171,11 @@
       "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-3.1.0.tgz",
       "integrity": "sha512-ivIvhpq/Y0uSjcHDcOIccjmYjGLcP09MFGE7ysAwkAvkXfpZlC985pH2/ui64DKazbTW/4kN3yqozUxlXzI6cA=="
     },
+    "events": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/events/-/events-2.1.0.tgz",
+      "integrity": "sha512-3Zmiobend8P9DjmKAty0Era4jV8oJ0yGYe2nJJAxgymF9+N8F2m0hhZiMoWtcfepExzNKZumFU3ksdQbInGWCg=="
+    },
     "evp_bytestokey": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/evp_bytestokey/-/evp_bytestokey-1.0.3.tgz",
@@ -3185,6 +3517,11 @@
         }
       }
     },
+    "get-assigned-identifiers": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/get-assigned-identifiers/-/get-assigned-identifiers-1.2.0.tgz",
+      "integrity": "sha512-mBBwmeGTrxEMO4pMaaf/uUEFHnYtwr8FTe8Y/mer4rcV/bye0qGm6pw1bGZFGStxC5O76c5ZAVBGnqHmOaJpdQ=="
+    },
     "get-caller-file": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
@@ -3636,6 +3973,11 @@
       "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.7.1.tgz",
       "integrity": "sha512-7T/BxH19zbcCTa8XkMlbK5lTo1WtgkFi3GvdWEyNuc4Vex7/9Dqbnpsf4JMydcfj9HCg4zUWFTL3Za6lapg5/w=="
     },
+    "htmlescape": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/htmlescape/-/htmlescape-1.1.1.tgz",
+      "integrity": "sha1-OgPtwiFLyjtmQko+eVk0lQnLA1E="
+    },
     "http-errors": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.2.tgz",
@@ -3670,6 +4012,11 @@
         "sshpk": "^1.7.0"
       }
     },
+    "https-browserify": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/https-browserify/-/https-browserify-1.0.0.tgz",
+      "integrity": "sha1-7AbBDgo0wPL68Zn3/X/Hj//QPHM="
+    },
     "iconv-lite": {
       "version": "0.4.24",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
@@ -3736,6 +4083,14 @@
       "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.5.tgz",
       "integrity": "sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw=="
     },
+    "inline-source-map": {
+      "version": "0.6.2",
+      "resolved": "https://registry.npmjs.org/inline-source-map/-/inline-source-map-0.6.2.tgz",
+      "integrity": "sha1-+Tk0ccGKedFyT4Y/o4tYY3Ct4qU=",
+      "requires": {
+        "source-map": "~0.5.3"
+      }
+    },
     "inquirer": {
       "version": "6.5.0",
       "resolved": "https://registry.npmjs.org/inquirer/-/inquirer-6.5.0.tgz",
@@ -3771,6 +4126,30 @@
         }
       }
     },
+    "insert-module-globals": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/insert-module-globals/-/insert-module-globals-7.2.0.tgz",
+      "integrity": "sha512-VE6NlW+WGn2/AeOMd496AHFYmE7eLKkUY6Ty31k4og5vmA3Fjuwe9v6ifH6Xx/Hz27QvdoMoviw1/pqWRB09Sw==",
+      "requires": {
+        "JSONStream": "^1.0.3",
+        "acorn-node": "^1.5.2",
+        "combine-source-map": "^0.8.0",
+        "concat-stream": "^1.6.1",
+        "is-buffer": "^1.1.0",
+        "path-is-absolute": "^1.0.1",
+        "process": "~0.11.0",
+        "through2": "^2.0.0",
+        "undeclared-identifiers": "^1.1.2",
+        "xtend": "^4.0.0"
+      },
+      "dependencies": {
+        "process": {
+          "version": "0.11.10",
+          "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
+          "integrity": "sha1-czIwDoQBYb2j5podHZGn1LwW8YI="
+        }
+      }
+    },
     "interpret": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/interpret/-/interpret-1.2.0.tgz",
@@ -4085,6 +4464,14 @@
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
       "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg=="
     },
+    "json-stable-stringify": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-0.0.1.tgz",
+      "integrity": "sha1-YRwj6BTbN1Un34URk9tZ3Sryf0U=",
+      "requires": {
+        "jsonify": "~0.0.0"
+      }
+    },
     "json-stable-stringify-without-jsonify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz",
@@ -4103,6 +4490,16 @@
         "graceful-fs": "^4.1.6"
       }
     },
+    "jsonify": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/jsonify/-/jsonify-0.0.0.tgz",
+      "integrity": "sha1-LHS27kHZPKUbe1qu6PUDYx0lKnM="
+    },
+    "jsonparse": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/jsonparse/-/jsonparse-1.3.1.tgz",
+      "integrity": "sha1-P02uSpH6wxX3EGL4UhzCOfE2YoA="
+    },
     "jsprim": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/jsprim/-/jsprim-1.4.1.tgz",
@@ -4144,6 +4541,15 @@
       "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
       "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA=="
     },
+    "labeled-stream-splicer": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/labeled-stream-splicer/-/labeled-stream-splicer-2.0.2.tgz",
+      "integrity": "sha512-Ca4LSXFFZUjPScRaqOcFxneA0VpKZr4MMYCljyQr4LIewTLb3Y0IUTIsnBBsVubIeEfxeSZpSjSsRM8APEQaAw==",
+      "requires": {
+        "inherits": "^2.0.1",
+        "stream-splicer": "^2.0.0"
+      }
+    },
     "last-run": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/last-run/-/last-run-1.1.1.tgz",
@@ -4227,6 +4633,11 @@
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
       "integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw=="
     },
+    "lodash.memoize": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-3.0.4.tgz",
+      "integrity": "sha1-LcvSwofLwKVcxCMovQxzYVDVPj8="
+    },
     "lowercase-keys": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/lowercase-keys/-/lowercase-keys-1.0.1.tgz",
@@ -4532,6 +4943,28 @@
       "resolved": "https://registry.npmjs.org/mock-fs/-/mock-fs-4.10.1.tgz",
       "integrity": "sha512-w22rOL5ZYu6HbUehB5deurghGM0hS/xBVyHMGKOuQctkk93J9z9VEOhDsiWrXOprVNQpP9uzGKdl8v9mFspKuw=="
     },
+    "module-deps": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/module-deps/-/module-deps-6.2.1.tgz",
+      "integrity": "sha512-UnEn6Ah36Tu4jFiBbJVUtt0h+iXqxpLqDvPS8nllbw5RZFmNJ1+Mz5BjYnM9ieH80zyxHkARGLnMIHlPK5bu6A==",
+      "requires": {
+        "JSONStream": "^1.0.3",
+        "browser-resolve": "^1.7.0",
+        "cached-path-relative": "^1.0.2",
+        "concat-stream": "~1.6.0",
+        "defined": "^1.0.0",
+        "detective": "^5.0.2",
+        "duplexer2": "^0.1.2",
+        "inherits": "^2.0.1",
+        "parents": "^1.0.0",
+        "readable-stream": "^2.0.2",
+        "resolve": "^1.4.0",
+        "stream-combiner2": "^1.1.1",
+        "subarg": "^1.0.0",
+        "through2": "^2.0.0",
+        "xtend": "^4.0.0"
+      }
+    },
     "mout": {
       "version": "0.11.1",
       "resolved": "https://registry.npmjs.org/mout/-/mout-0.11.1.tgz",
@@ -4851,6 +5284,11 @@
       "resolved": "https://registry.npmjs.org/original-require/-/original-require-1.0.1.tgz",
       "integrity": "sha1-DxMEcVhM0zURxew4yNWSE/msXiA="
     },
+    "os-browserify": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/os-browserify/-/os-browserify-0.3.0.tgz",
+      "integrity": "sha1-hUNzx/XCMVkU/Jv8a9gjj92h7Cc="
+    },
     "os-locale": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-3.1.0.tgz",
@@ -4915,6 +5353,11 @@
       "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
       "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ=="
     },
+    "pako": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.10.tgz",
+      "integrity": "sha512-0DTvPVU3ed8+HNXOu5Bs+o//Mbdj9VNQMUOe9oKCwh8l0GNwpTDMKCWbRjgtD291AWnkAgkqA/LOnQS8AmS1tw=="
+    },
     "parent-module": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
@@ -4923,6 +5366,14 @@
         "callsites": "^3.0.0"
       }
     },
+    "parents": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parents/-/parents-1.0.1.tgz",
+      "integrity": "sha1-/t1NK/GTp3dF/nHjcdc8MwfZx1E=",
+      "requires": {
+        "path-platform": "~0.11.15"
+      }
+    },
     "parse-asn1": {
       "version": "5.1.4",
       "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.4.tgz",
@@ -4983,6 +5434,11 @@
       "resolved": "https://registry.npmjs.org/pascalcase/-/pascalcase-0.1.1.tgz",
       "integrity": "sha1-s2PlXoAGym/iF4TS2yK9FdeRfxQ="
     },
+    "path-browserify": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/path-browserify/-/path-browserify-0.0.1.tgz",
+      "integrity": "sha512-BapA40NHICOS+USX9SN4tyhq+A2RrN/Ws5F0Z5aMHDp98Fl86lX8Oti8B7uN93L4Ifv4fHOEA+pQw87gmMO/lQ=="
+    },
     "path-dirname": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/path-dirname/-/path-dirname-1.0.2.tgz",
@@ -5013,6 +5469,11 @@
       "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
       "integrity": "sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw=="
     },
+    "path-platform": {
+      "version": "0.11.15",
+      "resolved": "https://registry.npmjs.org/path-platform/-/path-platform-0.11.15.tgz",
+      "integrity": "sha1-6GQhf3TDaFDwhSt43Hv31KVyG/I="
+    },
     "path-root": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/path-root/-/path-root-0.1.1.tgz",
@@ -5198,6 +5659,16 @@
         "strict-uri-encode": "^1.0.0"
       }
     },
+    "querystring": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/querystring/-/querystring-0.2.0.tgz",
+      "integrity": "sha1-sgmEkgO7Jd+CDadW50cAWHhSFiA="
+    },
+    "querystring-es3": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/querystring-es3/-/querystring-es3-0.2.1.tgz",
+      "integrity": "sha1-nsYfeQSYdXB9aUFFlv2Qek1xHnM="
+    },
     "querystringify": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-2.1.1.tgz",
@@ -5241,6 +5712,14 @@
         "unpipe": "1.0.0"
       }
     },
+    "read-only-stream": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/read-only-stream/-/read-only-stream-2.0.0.tgz",
+      "integrity": "sha1-JyT9aoET1zdkrCiNQ4YnDB2/F/A=",
+      "requires": {
+        "readable-stream": "^2.0.2"
+      }
+    },
     "read-pkg": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-1.1.0.tgz",
@@ -5750,6 +6229,15 @@
         }
       }
     },
+    "shasum": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/shasum/-/shasum-1.0.2.tgz",
+      "integrity": "sha1-5wEjENj0F/TetXEhUOVni4euVl8=",
+      "requires": {
+        "json-stable-stringify": "~0.0.0",
+        "sha.js": "~2.4.4"
+      }
+    },
     "shebang-command": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
@@ -5763,6 +6251,17 @@
       "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
       "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM="
     },
+    "shell-quote": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.6.1.tgz",
+      "integrity": "sha1-9HgZSczkAmlxJ0MOo7PFR29IF2c=",
+      "requires": {
+        "array-filter": "~0.0.0",
+        "array-map": "~0.0.0",
+        "array-reduce": "~0.0.0",
+        "jsonify": "~0.0.0"
+      }
+    },
     "signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
@@ -5915,6 +6414,59 @@
         "yargs": "^12.0.5"
       },
       "dependencies": {
+        "eslint": {
+          "version": "5.16.0",
+          "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
+          "integrity": "sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==",
+          "requires": {
+            "@babel/code-frame": "^7.0.0",
+            "ajv": "^6.9.1",
+            "chalk": "^2.1.0",
+            "cross-spawn": "^6.0.5",
+            "debug": "^4.0.1",
+            "doctrine": "^3.0.0",
+            "eslint-scope": "^4.0.3",
+            "eslint-utils": "^1.3.1",
+            "eslint-visitor-keys": "^1.0.0",
+            "espree": "^5.0.1",
+            "esquery": "^1.0.1",
+            "esutils": "^2.0.2",
+            "file-entry-cache": "^5.0.1",
+            "functional-red-black-tree": "^1.0.1",
+            "glob": "^7.1.2",
+            "globals": "^11.7.0",
+            "ignore": "^4.0.6",
+            "import-fresh": "^3.0.0",
+            "imurmurhash": "^0.1.4",
+            "inquirer": "^6.2.2",
+            "js-yaml": "^3.13.0",
+            "json-stable-stringify-without-jsonify": "^1.0.1",
+            "levn": "^0.3.0",
+            "lodash": "^4.17.11",
+            "minimatch": "^3.0.4",
+            "mkdirp": "^0.5.1",
+            "natural-compare": "^1.4.0",
+            "optionator": "^0.8.2",
+            "path-is-inside": "^1.0.2",
+            "progress": "^2.0.0",
+            "regexpp": "^2.0.1",
+            "semver": "^5.5.1",
+            "strip-ansi": "^4.0.0",
+            "strip-json-comments": "^2.0.1",
+            "table": "^5.2.3",
+            "text-table": "^0.2.0"
+          }
+        },
+        "espree": {
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.1.tgz",
+          "integrity": "sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==",
+          "requires": {
+            "acorn": "^6.0.7",
+            "acorn-jsx": "^5.0.0",
+            "eslint-visitor-keys": "^1.0.0"
+          }
+        },
         "keccak": {
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/keccak/-/keccak-2.0.0.tgz",
@@ -6041,16 +6593,55 @@
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
       "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
     },
+    "stream-browserify": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/stream-browserify/-/stream-browserify-2.0.2.tgz",
+      "integrity": "sha512-nX6hmklHs/gr2FuxYDltq8fJA1GDlxKQCz8O/IM4atRqBH8OORmBNgfvW5gG10GT/qQ9u0CzIvr2X5Pkt6ntqg==",
+      "requires": {
+        "inherits": "~2.0.1",
+        "readable-stream": "^2.0.2"
+      }
+    },
+    "stream-combiner2": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/stream-combiner2/-/stream-combiner2-1.1.1.tgz",
+      "integrity": "sha1-+02KFCDqNidk4hrUeAOXvry0HL4=",
+      "requires": {
+        "duplexer2": "~0.1.0",
+        "readable-stream": "^2.0.2"
+      }
+    },
     "stream-exhaust": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/stream-exhaust/-/stream-exhaust-1.0.2.tgz",
       "integrity": "sha512-b/qaq/GlBK5xaq1yrK9/zFcyRSTNxmcZwFLGSTG0mXgZl/4Z6GgiyYOXOvY7N3eEvFRAG1bkDRz5EPGSvPYQlw=="
     },
+    "stream-http": {
+      "version": "2.8.3",
+      "resolved": "https://registry.npmjs.org/stream-http/-/stream-http-2.8.3.tgz",
+      "integrity": "sha512-+TSkfINHDo4J+ZobQLWiMouQYB+UVYFttRA94FpEzzJ7ZdqcL4uUUQ7WkdkI4DSozGmgBUE/a47L+38PenXhUw==",
+      "requires": {
+        "builtin-status-codes": "^3.0.0",
+        "inherits": "^2.0.1",
+        "readable-stream": "^2.3.6",
+        "to-arraybuffer": "^1.0.0",
+        "xtend": "^4.0.0"
+      }
+    },
     "stream-shift": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/stream-shift/-/stream-shift-1.0.0.tgz",
       "integrity": "sha1-1cdSgl5TZ+eG944Y5EXqIjoVWVI="
     },
+    "stream-splicer": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/stream-splicer/-/stream-splicer-2.0.1.tgz",
+      "integrity": "sha512-Xizh4/NPuYSyAXyT7g8IvdJ9HJpxIGL9PjyhtywCZvvP0OPIdqyrr4dMikeuvY8xahpdKEBlBTySe583totajg==",
+      "requires": {
+        "inherits": "^2.0.1",
+        "readable-stream": "^2.0.2"
+      }
+    },
     "strict-uri-encode": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
@@ -6132,6 +6723,21 @@
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
       "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
     },
+    "subarg": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/subarg/-/subarg-1.0.0.tgz",
+      "integrity": "sha1-9izxdYHplrSPyWVpn1TAauJouNI=",
+      "requires": {
+        "minimist": "^1.1.0"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
+        }
+      }
+    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -6207,17 +6813,36 @@
         }
       }
     },
-    "table": {
-      "version": "5.4.1",
-      "resolved": "https://registry.npmjs.org/table/-/table-5.4.1.tgz",
-      "integrity": "sha512-E6CK1/pZe2N75rGZQotFOdmzWQ1AILtgYbMAbAjvms0S1l5IDB47zG3nCnFGB/w+7nB3vKofbLXCH7HPBo864w==",
+    "syntax-error": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/syntax-error/-/syntax-error-1.4.0.tgz",
+      "integrity": "sha512-YPPlu67mdnHGTup2A8ff7BC2Pjq0e0Yp/IyTFN03zWO0RcK07uLcbi7C2KpGR2FvWbaB0+bfE27a+sBKebSo7w==",
       "requires": {
-        "ajv": "^6.9.1",
-        "lodash": "^4.17.11",
+        "acorn-node": "^1.2.0"
+      }
+    },
+    "table": {
+      "version": "5.4.4",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.4.tgz",
+      "integrity": "sha512-IIfEAUx5QlODLblLrGTTLJA7Tk0iLSGBvgY8essPRVNGHAzThujww1YqHLs6h3HfTg55h++RzLHH5Xw/rfv+mg==",
+      "requires": {
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
         "slice-ansi": "^2.1.0",
         "string-width": "^3.0.0"
       },
       "dependencies": {
+        "ajv": {
+          "version": "6.10.2",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+          "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
+          "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-regex": {
           "version": "4.1.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
@@ -6340,6 +6965,21 @@
       "resolved": "https://registry.npmjs.org/timed-out/-/timed-out-4.0.1.tgz",
       "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8="
     },
+    "timers-browserify": {
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/timers-browserify/-/timers-browserify-1.4.2.tgz",
+      "integrity": "sha1-ycWLV1voQHN1y14kYtrO50NZ9B0=",
+      "requires": {
+        "process": "~0.11.0"
+      },
+      "dependencies": {
+        "process": {
+          "version": "0.11.10",
+          "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
+          "integrity": "sha1-czIwDoQBYb2j5podHZGn1LwW8YI="
+        }
+      }
+    },
     "tmp": {
       "version": "0.0.33",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
@@ -6357,6 +6997,11 @@
         "is-negated-glob": "^1.0.0"
       }
     },
+    "to-arraybuffer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz",
+      "integrity": "sha1-fSKbH8xjfkZsoIEYCDanqr/4P0M="
+    },
     "to-buffer": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz",
@@ -7371,6 +8016,11 @@
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
       "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ=="
     },
+    "tty-browserify": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.1.tgz",
+      "integrity": "sha512-C3TaO7K81YvjCgQH9Q1S3R3P3BtN3RIM8n+OvX4il1K1zgE8ZhI0op7kClgkxtutIE8hQrcrHBXvIheqKUUCxw=="
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -7429,6 +8079,11 @@
       "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
       "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og=="
     },
+    "umd": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/umd/-/umd-3.0.3.tgz",
+      "integrity": "sha512-4IcGSufhFshvLNcMCV80UnQVlZ5pMOC8mvNPForqwA4+lzYQuetTESLDQkeLmihq8bRcnpbQa48Wb8Lh16/xow=="
+    },
     "unbzip2-stream": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/unbzip2-stream/-/unbzip2-stream-1.3.3.tgz",
@@ -7443,6 +8098,18 @@
       "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
       "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo="
     },
+    "undeclared-identifiers": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/undeclared-identifiers/-/undeclared-identifiers-1.1.3.tgz",
+      "integrity": "sha512-pJOW4nxjlmfwKApE4zvxLScM/njmwj/DiUBv7EabwE4O8kRUy+HIwxQtZLBPll/jx1LJyBcqNfB3/cpv9EZwOw==",
+      "requires": {
+        "acorn-node": "^1.3.0",
+        "dash-ast": "^1.0.0",
+        "get-assigned-identifiers": "^1.2.0",
+        "simple-concat": "^1.0.0",
+        "xtend": "^4.0.1"
+      }
+    },
     "underscore": {
       "version": "1.8.3",
       "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.8.3.tgz",
@@ -7553,6 +8220,22 @@
       "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
       "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI="
     },
+    "url": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
+      "integrity": "sha1-ODjpfPxgUh63PFJajlW/3Z4uKPE=",
+      "requires": {
+        "punycode": "1.3.2",
+        "querystring": "0.2.0"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "1.3.2",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.3.2.tgz",
+          "integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0="
+        }
+      }
+    },
     "url-parse": {
       "version": "1.4.4",
       "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.4.4.tgz",
@@ -7590,6 +8273,21 @@
       "resolved": "https://registry.npmjs.org/utf8/-/utf8-2.1.1.tgz",
       "integrity": "sha1-LgHbAvfY0JRPdxBPFgnrDDBM92g="
     },
+    "util": {
+      "version": "0.10.4",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.10.4.tgz",
+      "integrity": "sha512-0Pm9hTQ3se5ll1XihRic3FDIku70C+iHUdT/W926rSgHV5QgXsYbKZN8MSC3tJtSkhuROzvsQjAaFENRXr+19A==",
+      "requires": {
+        "inherits": "2.0.3"
+      },
+      "dependencies": {
+        "inherits": {
+          "version": "2.0.3",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+          "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
+        }
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -7693,6 +8391,11 @@
         "vinyl": "^2.0.0"
       }
     },
+    "vm-browserify": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-1.1.0.tgz",
+      "integrity": "sha512-iq+S7vZJE60yejDYM0ek6zg308+UZsdtPExWP9VZoCFCz1zkJoXFnAX7aZfd/ZwrkidzdUZL0C/ryW+JwAiIGw=="
+    },
     "web3": {
       "version": "1.0.0-beta.55",
       "resolved": "https://registry.npmjs.org/web3/-/web3-1.0.0-beta.55.tgz",
diff --git a/package.json b/package.json
index 7cd515c..a5a5d52 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "circomlib": "^0.0.10",
     "dotenv": "^8.0.0",
     "express": "^4.17.1",
+    "eslint": "^6.0.1",
     "ganache-cli": "^6.4.5",
     "snarkjs": "git+https://github.com/iden3/snarkjs.git#5fe2bd4642ec567c75ad5ac3f73687999c412e73",
     "truffle": "^5.0.27",
diff --git a/scripts/ganacheHelper.js b/scripts/ganacheHelper.js
index 517d197..8ad1906 100644
--- a/scripts/ganacheHelper.js
+++ b/scripts/ganacheHelper.js
@@ -1,38 +1,39 @@
 function send(method, params = []) {
   return new Promise((resolve, reject) => {
+    // eslint-disable-next-line no-undef
     web3.currentProvider.send({
       jsonrpc: '2.0',
       id: Date.now(),
       method,
       params
     }, (err, res) => {
-      return err ? reject(err) : resolve(res);
-    });
-  });
+      return err ? reject(err) : resolve(res)
+    })
+  })
 }
 
-const takeSnapshot = async seconds => {
-  return await send('evm_snapshot');
+const takeSnapshot = async () => {
+  return await send('evm_snapshot')
 }
 
 const revertSnapshot = async (id) => {
-  await send('evm_revert', [id]);
+  await send('evm_revert', [id])
 }
 
 const mineBlock = async (timestamp) => {
-  await send('evm_mine', [timestamp]);
+  await send('evm_mine', [timestamp])
 }
 
 const increaseTime = async (seconds) => {
-  await send('evm_increaseTime', [seconds]);
+  await send('evm_increaseTime', [seconds])
 }
 
 const minerStop = async () => {
-  await send('miner_stop', []);
+  await send('miner_stop', [])
 }
 
 const minerStart = async () => {
-  await send('miner_start', []);
+  await send('miner_start', [])
 }
 
 module.exports = {
@@ -42,4 +43,4 @@ module.exports = {
   minerStop,
   minerStart,
   increaseTime,
-};
+}
diff --git a/scripts/utils.js b/scripts/utils.js
index 0d00f1b..2da67cb 100644
--- a/scripts/utils.js
+++ b/scripts/utils.js
@@ -1,19 +1,19 @@
-const snarkjs = require("snarkjs");
-const groth = snarkjs["groth"];
-const crypto = require("crypto");
-const circomlib = require('circomlib');
-const pedersen = circomlib.pedersenHash;
-const babyjub = circomlib.babyJub;
-const websnarkUtils = require('websnark/src/utils');
-const unstringifyBigInts2 = require("snarkjs/src/stringifybigint").unstringifyBigInts;
+const snarkjs = require('snarkjs')
+const groth = snarkjs['groth']
+const crypto = require('crypto')
+const circomlib = require('circomlib')
+const pedersen = circomlib.pedersenHash
+const babyjub = circomlib.babyJub
+const websnarkUtils = require('websnark/src/utils')
+const unstringifyBigInts2 = require('snarkjs/src/stringifybigint').unstringifyBigInts
 
-const rbigint = (nbytes) => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes));
-const pedersenHash = (data) => babyjub.unpackPoint(pedersen.hash(data))[0];
+const rbigint = (nbytes) => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
+const pedersenHash = (data) => babyjub.unpackPoint(pedersen.hash(data))[0]
 
 function snarkVerify(proof) {
-  proof = unstringifyBigInts2(websnarkUtils.fromSolidityInput(proof));
-  const verification_key = unstringifyBigInts2(require('../build/circuits/withdraw_verification_key.json'));
-  return groth.isValid(verification_key, proof, proof.publicSignals);
+  proof = unstringifyBigInts2(websnarkUtils.fromSolidityInput(proof))
+  const verification_key = unstringifyBigInts2(require('../build/circuits/withdraw_verification_key.json'))
+  return groth.isValid(verification_key, proof, proof.publicSignals)
 }
 
-module.exports = {rbigint, pedersenHash, snarkVerify};
+module.exports = { rbigint, pedersenHash, snarkVerify }
diff --git a/test/MerkleTreeWithHistory.test.js b/test/MerkleTreeWithHistory.test.js
index 16a8605..8fd5a72 100644
--- a/test/MerkleTreeWithHistory.test.js
+++ b/test/MerkleTreeWithHistory.test.js
@@ -1,10 +1,10 @@
-const should = require('chai')
+/*global artifacts, web3, contract, assert*/
+require('chai')
   .use(require('bn-chai')(web3.utils.BN))
   .use(require('chai-as-promised'))
-.should()
+  .should()
 
-const { toWei, toBN } = require('web3-utils')
-const { takeSnapshot, revertSnapshot, increaseTime } = require('../scripts/ganacheHelper');
+const { takeSnapshot, revertSnapshot } = require('../scripts/ganacheHelper')
 
 const MerkleTreeWithHistory = artifacts.require('./MerkleTreeWithHistoryMock.sol')
 const MiMC = artifacts.require('./MiMC.sol')
@@ -14,6 +14,7 @@ const MimcHasher = require('../lib/MiMC')
 
 const { AMOUNT, MERKLE_TREE_HEIGHT, EMPTY_ELEMENT } = process.env
 
+// eslint-disable-next-line no-unused-vars
 function BNArrayToStringArray(array) {
   const arrayToPrint = []
   array.forEach(item => {
@@ -22,13 +23,13 @@ function BNArrayToStringArray(array) {
   return arrayToPrint
 }
 
-contract('MerkleTreeWithHistory', async accounts => {
+contract('MerkleTreeWithHistory', accounts => {
   let merkleTreeWithHistory
   let miMC
-  const sender = accounts[0]
-  const emptyAddress = '0x0000000000000000000000000000000000000000'
   let levels = MERKLE_TREE_HEIGHT || 16
   let zeroValue = EMPTY_ELEMENT || 1337
+  const sender = accounts[0]
+  // eslint-disable-next-line no-unused-vars
   const value = AMOUNT || '1000000000000000000'
   let snapshotId
   let prefix = 'test'
@@ -48,26 +49,20 @@ contract('MerkleTreeWithHistory', async accounts => {
     snapshotId = await takeSnapshot()
   })
 
-  describe('#constructor', async () => {
+  describe('#constructor', () => {
     it('should initialize', async () => {
       const filled_subtrees = await merkleTreeWithHistory.filled_subtrees()
-      // console.log('filled_subtrees', BNArrayToStringArray(filled_subtrees))
-      const root = await merkleTreeWithHistory.getLastRoot()
-      // console.log('root', root.toString())
       filled_subtrees[0].should.be.eq.BN(zeroValue)
       const zeros = await merkleTreeWithHistory.zeros()
-      // console.log('zeros', BNArrayToStringArray(zeros))
       zeros[0].should.be.eq.BN(zeroValue)
-      const roots = await merkleTreeWithHistory.roots()
-      // console.log('roots', BNArrayToStringArray(roots))
     })
   })
 
-  describe('merkleTreeLib', async () => {
-    it('index_to_key', async () => {
+  describe('merkleTreeLib', () => {
+    it('index_to_key', () => {
       assert.equal(
         MerkleTree.index_to_key('test', 5, 20),
-        "test_tree_5_20",
+        'test_tree_5_20',
       )
     })
 
@@ -80,7 +75,7 @@ contract('MerkleTreeWithHistory', async accounts => {
         prefix,
       )
       await tree.insert('5')
-      let {root, path_elements, path_index} = await tree.path(0)
+      let { root, path_elements } = await tree.path(0)
       const calculated_root = hasher.hash(null,
         hasher.hash(null, '5', path_elements[0]),
         path_elements[1]
@@ -90,7 +85,7 @@ contract('MerkleTreeWithHistory', async accounts => {
     })
     it('creation odd elements count', async () => {
       const elements = [12, 13, 14, 15, 16, 17, 18, 19, 20]
-      for(const [i, el] of Object.entries(elements)) {
+      for(const [, el] of Object.entries(elements)) {
         await tree.insert(el)
       }
 
@@ -99,8 +94,8 @@ contract('MerkleTreeWithHistory', async accounts => {
         zeroValue,
         elements,
         prefix,
-      );
-      for(const [i, el] of Object.entries(elements)) {
+      )
+      for(const [i] of Object.entries(elements)) {
         const pathViaConstructor = await batchTree.path(i)
         const pathViaUpdate = await tree.path(i)
         pathViaConstructor.should.be.deep.equal(pathViaUpdate)
@@ -109,7 +104,7 @@ contract('MerkleTreeWithHistory', async accounts => {
 
     it('creation even elements count', async () => {
       const elements = [12, 13, 14, 15, 16, 17]
-      for(const [i, el] of Object.entries(elements)) {
+      for(const [, el] of Object.entries(elements)) {
         await tree.insert(el)
       }
 
@@ -118,27 +113,27 @@ contract('MerkleTreeWithHistory', async accounts => {
         zeroValue,
         elements,
         prefix,
-      );
-      for(const [i, el] of Object.entries(elements)) {
+      )
+      for(const [i] of Object.entries(elements)) {
         const pathViaConstructor = await batchTree.path(i)
         const pathViaUpdate = await tree.path(i)
         pathViaConstructor.should.be.deep.equal(pathViaUpdate)
       }
     })
 
-    it.skip('creation using 30000 elements', async () => {
+    it.skip('creation using 30000 elements', () => {
       const elements = []
       for(let i = 1000; i < 31001; i++) {
         elements.push(i)
       }
-      console.time('MerkleTree');
+      console.time('MerkleTree')
       tree = new MerkleTree(
         levels,
         zeroValue,
         elements,
         prefix,
-      );
-      console.timeEnd('MerkleTree');
+      )
+      console.timeEnd('MerkleTree')
       // 2,7 GHz Intel Core i7
       // 1000 : 1949.084ms
       // 10000: 19456.220ms
@@ -146,21 +141,16 @@ contract('MerkleTreeWithHistory', async accounts => {
     })
   })
 
-  describe('#insert', async () => {
+  describe('#insert', () => {
     it('should insert', async () => {
       let rootFromContract
 
-      for (i = 1; i < 11; i++) {
-        await merkleTreeWithHistory.insert(i)
+      for (let i = 1; i < 11; i++) {
+        await merkleTreeWithHistory.insert(i, { from: sender })
         await tree.insert(i)
-        filled_subtrees = await merkleTreeWithHistory.filled_subtrees()
-        let {root, path_elements, path_index} = await tree.path(i - 1)
-        // console.log('path_elements  ', path_elements)
-        // console.log('filled_subtrees', BNArrayToStringArray(filled_subtrees))
-        // console.log('rootFromLib', root)
+        let { root } = await tree.path(i - 1)
         rootFromContract = await merkleTreeWithHistory.getLastRoot()
         root.should.be.equal(rootFromContract.toString())
-        // console.log('rootFromCon', root.toString())
       }
     })
 
@@ -169,7 +159,7 @@ contract('MerkleTreeWithHistory', async accounts => {
       zeroValue = 1337
       merkleTreeWithHistory = await MerkleTreeWithHistory.new(levels, zeroValue)
 
-      for (i = 0; i < 2**(levels - 1); i++) {
+      for (let i = 0; i < 2**(levels - 1); i++) {
         await merkleTreeWithHistory.insert(i+42).should.be.fulfilled
       }
 
@@ -181,15 +171,9 @@ contract('MerkleTreeWithHistory', async accounts => {
     })
   })
 
-  describe('#MIMC', async () => {
-    it.skip('gas price', async () => {
-      const gas = await merkleTreeWithHistory.hashLeftRight.estimateGas(1,2)
-      // console.log('gas', gas)
-    })
-  })
-
   afterEach(async () => {
     await revertSnapshot(snapshotId.result)
+    // eslint-disable-next-line require-atomic-updates
     snapshotId = await takeSnapshot()
     hasher = new MimcHasher()
     tree = new MerkleTree(