diff --git a/.gitignore b/.gitignore
index 4d72169..811631f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,4 +42,5 @@ test/data/.temp
 *.orig
 
 # Prevent unit test coverage reports from being added
-.coverage
\ No newline at end of file
+.coverage
+.nyc_output
\ No newline at end of file
diff --git a/.npmignore b/.npmignore
index 4d72169..811631f 100644
--- a/.npmignore
+++ b/.npmignore
@@ -42,4 +42,5 @@ test/data/.temp
 *.orig
 
 # Prevent unit test coverage reports from being added
-.coverage
\ No newline at end of file
+.coverage
+.nyc_output
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 34e8952..3fc1f37 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,60 @@
         "@babel/highlight": "^7.0.0"
       }
     },
+    "@babel/generator": {
+      "version": "7.11.0",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.11.0.tgz",
+      "integrity": "sha512-fEm3Uzw7Mc9Xi//qU20cBKatTfs2aOtKqmvy/Vm7RkJEGFQ4xc9myCfbXxqK//ZS8MR/ciOHw6meGASJuKmDfQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.11.0",
+        "jsesc": "^2.5.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.10.4.tgz",
+      "integrity": "sha512-YdaSyz1n8gY44EmN7x44zBn9zQ1Ry2Y+3GTA+3vH6Mizke1Vw0aWDM66FOYEPw8//qKkmqOckrGgTYa+6sceqQ==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.10.4",
+        "@babel/template": "^7.10.4",
+        "@babel/types": "^7.10.4"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.10.4.tgz",
+      "integrity": "sha512-EkN3YDB+SRDgiIUnNgcmiD361ti+AVbL3f3Henf6dqqUyr5dMsorno0lJWJuLhDhkI5sYEpgj6y9kB8AOU1I2A==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.10.4"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.11.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.11.0.tgz",
+      "integrity": "sha512-74Vejvp6mHkGE+m+k5vHY93FX2cAtrw1zXrZXRlG4l410Nm9PxfEiVTn1PjDPV5SnmieiueY4AFg2xqhNFuuZg==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.11.0"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
+      "dev": true
+    },
     "@babel/highlight": {
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
@@ -24,6 +78,12 @@
         "js-tokens": "^4.0.0"
       }
     },
+    "@babel/parser": {
+      "version": "7.11.3",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.11.3.tgz",
+      "integrity": "sha512-REo8xv7+sDxkKvoxEywIdsNFiZLybwdI7hcT5uEPyQrSMB4YQ973BfC9OOrD/81MaIjh6UxdulIQXkjmiH3PcA==",
+      "dev": true
+    },
     "@babel/runtime": {
       "version": "7.9.2",
       "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.9.2.tgz",
@@ -32,17 +92,94 @@
         "regenerator-runtime": "^0.13.4"
       }
     },
+    "@babel/template": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.10.4.tgz",
+      "integrity": "sha512-ZCjD27cGJFUB6nmCB1Enki3r+L5kJveX9pq1SvAUKoICy6CZ9yD8xO086YXdYhvNjBdnekm4ZnaP5yC8Cs/1tA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/parser": "^7.10.4",
+        "@babel/types": "^7.10.4"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.10.4",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+          "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.10.4"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.10.4",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+          "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.10.4",
+            "chalk": "^2.0.0",
+            "js-tokens": "^4.0.0"
+          }
+        }
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.11.0",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.11.0.tgz",
+      "integrity": "sha512-ZB2V+LskoWKNpMq6E5UUCrjtDUh5IOTAyIl0dTjIEoXum/iKWkoIEKIRDnUucO6f+2FzNkE0oD4RLKoPIufDtg==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/generator": "^7.11.0",
+        "@babel/helper-function-name": "^7.10.4",
+        "@babel/helper-split-export-declaration": "^7.11.0",
+        "@babel/parser": "^7.11.0",
+        "@babel/types": "^7.11.0",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.19"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.10.4",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+          "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.10.4"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.10.4",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+          "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.10.4",
+            "chalk": "^2.0.0",
+            "js-tokens": "^4.0.0"
+          }
+        }
+      }
+    },
+    "@babel/types": {
+      "version": "7.11.0",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.11.0.tgz",
+      "integrity": "sha512-O53yME4ZZI0jO1EVGtF1ePGl0LHirG4P1ibcD80XyzZcKhcMFeCXmh4Xb1ifGBIV233Qg12x4rBfQgA+tmOukA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.10.4",
+        "lodash": "^4.17.19",
+        "to-fast-properties": "^2.0.0"
+      }
+    },
     "@types/color-name": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ=="
     },
-    "abbrev": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
-      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
-      "dev": true
-    },
     "acorn": {
       "version": "6.4.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
@@ -66,13 +203,6 @@
         "uri-js": "^4.2.2"
       }
     },
-    "amdefine": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true,
-      "optional": true
-    },
     "ansi-escapes": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.2.1.tgz",
@@ -95,6 +225,21 @@
         "color-convert": "^1.9.0"
       }
     },
+    "append-transform": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
+      "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^2.0.0"
+      }
+    },
+    "archy": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
+      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
+      "dev": true
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -153,6 +298,18 @@
       "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
       "dev": true
     },
+    "caching-transform": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/caching-transform/-/caching-transform-3.0.2.tgz",
+      "integrity": "sha512-Mtgcv3lh3U0zRii/6qVgQODdPA4G3zhG+jtbCWj39RXuUFTMzH0vcdMtaJS1jPowd+It2Pqr6y3NJMQqOqCE2w==",
+      "dev": true,
+      "requires": {
+        "hasha": "^3.0.0",
+        "make-dir": "^2.0.0",
+        "package-hash": "^3.0.0",
+        "write-file-atomic": "^2.4.2"
+      }
+    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -308,18 +465,46 @@
         }
       }
     },
+    "commondir": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/commondir/-/commondir-1.0.1.tgz",
+      "integrity": "sha1-3dgA2gxmEnOTzKWVDqloo6rxJTs=",
+      "dev": true
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
+    "convert-source-map": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.7.0.tgz",
+      "integrity": "sha512-4FJkXzKXEDB1snCFZlLP4gpC3JILicCpGbzG9f9G7tGqGCzETQ2hWPrcinA9oU4wtf2biUaEH5065UnMeR33oA==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "~5.1.1"
+      }
+    },
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
+    "cp-file": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/cp-file/-/cp-file-6.2.0.tgz",
+      "integrity": "sha512-fmvV4caBnofhPe8kOcitBwSn2f39QLjnAnGq3gO9dfd75mUytzKNZB1hde6QHunW2Rt+OwuBOMc3i1tNElbszA==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.2",
+        "make-dir": "^2.0.0",
+        "nested-error-stacks": "^2.0.0",
+        "pify": "^4.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "cross-spawn": {
       "version": "6.0.5",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
@@ -370,6 +555,15 @@
       "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
       "dev": true
     },
+    "default-require-extensions": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/default-require-extensions/-/default-require-extensions-2.0.0.tgz",
+      "integrity": "sha1-9fj7sYp9bVCyH2QfZJ67Uiz+JPc=",
+      "dev": true,
+      "requires": {
+        "strip-bom": "^3.0.0"
+      }
+    },
     "diff": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
@@ -464,6 +658,21 @@
       "resolved": "https://registry.npmjs.org/entities/-/entities-1.1.2.tgz",
       "integrity": "sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w=="
     },
+    "error-ex": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
+      "integrity": "sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==",
+      "dev": true,
+      "requires": {
+        "is-arrayish": "^0.2.1"
+      }
+    },
+    "es6-error": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/es6-error/-/es6-error-4.1.1.tgz",
+      "integrity": "sha512-Um/+FxMr9CISWh0bi5Zv0iOD+4cFh5qLeks1qhAopKVAJw3drgKbKySikp7wGhDL0HPeaja0P5ULZrxLkniUVg==",
+      "dev": true
+    },
     "escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -474,43 +683,6 @@
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
-    "escodegen": {
-      "version": "1.8.1",
-      "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-1.8.1.tgz",
-      "integrity": "sha1-WltTr0aTEQvrsIZ6o0MN07cKEBg=",
-      "dev": true,
-      "requires": {
-        "esprima": "^2.7.1",
-        "estraverse": "^1.9.1",
-        "esutils": "^2.0.2",
-        "optionator": "^0.8.1",
-        "source-map": "~0.2.0"
-      },
-      "dependencies": {
-        "esprima": {
-          "version": "2.7.3",
-          "resolved": "https://registry.npmjs.org/esprima/-/esprima-2.7.3.tgz",
-          "integrity": "sha1-luO3DVd59q1JzQMmc9HDEnZ7pYE=",
-          "dev": true
-        },
-        "estraverse": {
-          "version": "1.9.3",
-          "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-1.9.3.tgz",
-          "integrity": "sha1-r2fy3JIlgkFZUJJgkaQAXSnJu0Q=",
-          "dev": true
-        },
-        "source-map": {
-          "version": "0.2.0",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.2.0.tgz",
-          "integrity": "sha1-2rc/vPwrqBm03gO9b26qSBZLP50=",
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "amdefine": ">=0.0.4"
-          }
-        }
-      }
-    },
     "eslint": {
       "version": "5.16.0",
       "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
@@ -729,6 +901,17 @@
       "resolved": "https://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
       "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek="
     },
+    "find-cache-dir": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/find-cache-dir/-/find-cache-dir-2.1.0.tgz",
+      "integrity": "sha512-Tq6PixE0w/VMFfCgbONnkiQIVol/JJL7nRMi20fqzA4NRs9AfeqMGeRdPi3wIhYkxjeBaWh2rxwapn5Tu3IqOQ==",
+      "dev": true,
+      "requires": {
+        "commondir": "^1.0.1",
+        "make-dir": "^2.0.0",
+        "pkg-dir": "^3.0.0"
+      }
+    },
     "find-up": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
@@ -755,6 +938,28 @@
       "integrity": "sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg==",
       "dev": true
     },
+    "foreground-child": {
+      "version": "1.5.6",
+      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-1.5.6.tgz",
+      "integrity": "sha1-T9ca0t/elnibmApcCilZN8svXOk=",
+      "dev": true,
+      "requires": {
+        "cross-spawn": "^4",
+        "signal-exit": "^3.0.0"
+      },
+      "dependencies": {
+        "cross-spawn": {
+          "version": "4.0.2",
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-4.0.2.tgz",
+          "integrity": "sha1-e5JHYhwjrf3ThWAEqCPL45dCTUE=",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^4.0.1",
+            "which": "^1.2.9"
+          }
+        }
+      }
+    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -798,35 +1003,50 @@
       "integrity": "sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==",
       "dev": true
     },
+    "graceful-fs": {
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.4.tgz",
+      "integrity": "sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==",
+      "dev": true
+    },
     "growl": {
       "version": "1.10.5",
       "resolved": "https://registry.npmjs.org/growl/-/growl-1.10.5.tgz",
       "integrity": "sha512-qBr4OuELkhPenW6goKVXiv47US3clb3/IbuWF9KNKEijAy9oeHxU9IgzjvJhHkUzhaj7rOUD7+YGWqUjLp5oSA==",
       "dev": true
     },
-    "handlebars": {
-      "version": "4.5.3",
-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.5.3.tgz",
-      "integrity": "sha512-3yPecJoJHK/4c6aZhSvxOyG4vJKDshV36VHp0iVCDVh7o9w2vwi3NSnL2MMPj3YdduqaBcu7cGbggJQM0br9xA==",
-      "dev": true,
-      "requires": {
-        "neo-async": "^2.6.0",
-        "optimist": "^0.6.1",
-        "source-map": "^0.6.1",
-        "uglify-js": "^3.1.4"
-      }
-    },
     "has-flag": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
       "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0="
     },
+    "hasha": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/hasha/-/hasha-3.0.0.tgz",
+      "integrity": "sha1-UqMvq4Vp1BymmmH/GiFPjrfIvTk=",
+      "dev": true,
+      "requires": {
+        "is-stream": "^1.0.1"
+      }
+    },
     "he": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
       "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
       "dev": true
     },
+    "hosted-git-info": {
+      "version": "2.8.8",
+      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.8.tgz",
+      "integrity": "sha512-f/wzC2QaWBs7t9IYqB4T3sR1xviIViXJRJTWBlx2Gf3g0Xi5vI7Yy4koXQ1c9OYDGHN9sBy1DQ2AB8fqZBWhUg==",
+      "dev": true
+    },
+    "html-escaper": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/html-escaper/-/html-escaper-2.0.2.tgz",
+      "integrity": "sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==",
+      "dev": true
+    },
     "htmlparser2": {
       "version": "3.10.1",
       "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-3.10.1.tgz",
@@ -934,6 +1154,12 @@
         }
       }
     },
+    "is-arrayish": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.2.1.tgz",
+      "integrity": "sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0=",
+      "dev": true
+    },
     "is-extglob": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
@@ -960,6 +1186,12 @@
       "integrity": "sha1-eaKp7OfwlugPNtKy87wWwf9L8/o=",
       "dev": true
     },
+    "is-stream": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
+      "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ=",
+      "dev": true
+    },
     "isarray": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
@@ -972,70 +1204,80 @@
       "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=",
       "dev": true
     },
-    "istanbul": {
-      "version": "0.4.5",
-      "resolved": "https://registry.npmjs.org/istanbul/-/istanbul-0.4.5.tgz",
-      "integrity": "sha1-ZcfXPUxNqE1POsMQuRj7C4Azczs=",
+    "istanbul-lib-coverage": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.5.tgz",
+      "integrity": "sha512-8aXznuEPCJvGnMSRft4udDRDtb1V3pkQkMMI5LI+6HuQz5oQ4J2UFn1H82raA3qJtyOLkkwVqICBQkjnGtn5mA==",
+      "dev": true
+    },
+    "istanbul-lib-hook": {
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-hook/-/istanbul-lib-hook-2.0.7.tgz",
+      "integrity": "sha512-vrRztU9VRRFDyC+aklfLoeXyNdTfga2EI3udDGn4cZ6fpSXpHLV9X6CHvfoMCPtggg8zvDDmC4b9xfu0z6/llA==",
       "dev": true,
       "requires": {
-        "abbrev": "1.0.x",
-        "async": "1.x",
-        "escodegen": "1.8.x",
-        "esprima": "2.7.x",
-        "glob": "^5.0.15",
-        "handlebars": "^4.0.1",
-        "js-yaml": "3.x",
-        "mkdirp": "0.5.x",
-        "nopt": "3.x",
-        "once": "1.x",
-        "resolve": "1.1.x",
-        "supports-color": "^3.1.0",
-        "which": "^1.1.1",
-        "wordwrap": "^1.0.0"
+        "append-transform": "^1.0.0"
+      }
+    },
+    "istanbul-lib-instrument": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-instrument/-/istanbul-lib-instrument-3.3.0.tgz",
+      "integrity": "sha512-5nnIN4vo5xQZHdXno/YDXJ0G+I3dAm4XgzfSVTPLQpj/zAV2dV6Juy0yaf10/zrJOJeHoN3fraFe+XRq2bFVZA==",
+      "dev": true,
+      "requires": {
+        "@babel/generator": "^7.4.0",
+        "@babel/parser": "^7.4.3",
+        "@babel/template": "^7.4.0",
+        "@babel/traverse": "^7.4.3",
+        "@babel/types": "^7.4.0",
+        "istanbul-lib-coverage": "^2.0.5",
+        "semver": "^6.0.0"
+      }
+    },
+    "istanbul-lib-report": {
+      "version": "2.0.8",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-report/-/istanbul-lib-report-2.0.8.tgz",
+      "integrity": "sha512-fHBeG573EIihhAblwgxrSenp0Dby6tJMFR/HvlerBsrCTD5bkUuoNtn3gVh29ZCS824cGGBPn7Sg7cNk+2xUsQ==",
+      "dev": true,
+      "requires": {
+        "istanbul-lib-coverage": "^2.0.5",
+        "make-dir": "^2.1.0",
+        "supports-color": "^6.1.0"
       },
       "dependencies": {
-        "async": {
-          "version": "1.5.2",
-          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
-          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
-          "dev": true
-        },
-        "esprima": {
-          "version": "2.7.3",
-          "resolved": "https://registry.npmjs.org/esprima/-/esprima-2.7.3.tgz",
-          "integrity": "sha1-luO3DVd59q1JzQMmc9HDEnZ7pYE=",
-          "dev": true
-        },
-        "glob": {
-          "version": "5.0.15",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-5.0.15.tgz",
-          "integrity": "sha1-G8k2ueAvSmA/zCIuz3Yz0wuLk7E=",
-          "dev": true,
-          "requires": {
-            "inflight": "^1.0.4",
-            "inherits": "2",
-            "minimatch": "2 || 3",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
-          }
-        },
-        "has-flag": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-1.0.0.tgz",
-          "integrity": "sha1-nZ55MWXOAXoA8AQYxD+UKnsdEfo=",
-          "dev": true
-        },
         "supports-color": {
-          "version": "3.2.3",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-3.2.3.tgz",
-          "integrity": "sha1-ZawFBLOVQXHYpklGsq48u4pfVPY=",
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
           "dev": true,
           "requires": {
-            "has-flag": "^1.0.0"
+            "has-flag": "^3.0.0"
           }
         }
       }
     },
+    "istanbul-lib-source-maps": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-source-maps/-/istanbul-lib-source-maps-3.0.6.tgz",
+      "integrity": "sha512-R47KzMtDJH6X4/YW9XTx+jrLnZnscW4VpNN+1PViSYTejLVPWv7oov+Duf8YQSPyVRUvueQqz1TcsC6mooZTXw==",
+      "dev": true,
+      "requires": {
+        "debug": "^4.1.1",
+        "istanbul-lib-coverage": "^2.0.5",
+        "make-dir": "^2.1.0",
+        "rimraf": "^2.6.3",
+        "source-map": "^0.6.1"
+      }
+    },
+    "istanbul-reports": {
+      "version": "2.2.7",
+      "resolved": "https://registry.npmjs.org/istanbul-reports/-/istanbul-reports-2.2.7.tgz",
+      "integrity": "sha512-uu1F/L1o5Y6LzPVSVZXNOoD/KXpJue9aeLRd0sM9uMXfZvzomB0WxVamWb5ue8kA2vVWEmW7EG+A5n3f1kqHKg==",
+      "dev": true,
+      "requires": {
+        "html-escaper": "^2.0.0"
+      }
+    },
     "js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -1057,6 +1299,18 @@
       "integrity": "sha1-uvE3+44qVYgQrc8Z0tKi9oDpCl8=",
       "dev": true
     },
+    "jsesc": {
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz",
+      "integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==",
+      "dev": true
+    },
+    "json-parse-better-errors": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz",
+      "integrity": "sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw==",
+      "dev": true
+    },
     "json-schema-traverse": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
@@ -1083,6 +1337,26 @@
       "resolved": "https://registry.npmjs.org/liquid-json/-/liquid-json-0.3.1.tgz",
       "integrity": "sha1-kVWhgTbYprJhXl8W+aJEira1Duo="
     },
+    "load-json-file": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-4.0.0.tgz",
+      "integrity": "sha1-L19Fq5HjMhYjT9U62rZo607AmTs=",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.2",
+        "parse-json": "^4.0.0",
+        "pify": "^3.0.0",
+        "strip-bom": "^3.0.0"
+      },
+      "dependencies": {
+        "pify": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+          "dev": true
+        }
+      }
+    },
     "locate-path": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
@@ -1106,6 +1380,12 @@
       "resolved": "https://registry.npmjs.org/lodash.escaperegexp/-/lodash.escaperegexp-4.1.2.tgz",
       "integrity": "sha1-ZHYsSGGAglGKw99Mz11YhtriA0c="
     },
+    "lodash.flattendeep": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/lodash.flattendeep/-/lodash.flattendeep-4.4.0.tgz",
+      "integrity": "sha1-+wMJF/hqMTTlvJvsDWngAT3f7bI=",
+      "dev": true
+    },
     "lodash.isplainobject": {
       "version": "4.0.6",
       "resolved": "https://registry.npmjs.org/lodash.isplainobject/-/lodash.isplainobject-4.0.6.tgz",
@@ -1131,11 +1411,38 @@
         "yallist": "^2.1.2"
       }
     },
+    "make-dir": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
+      "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
+      "dev": true,
+      "requires": {
+        "pify": "^4.0.1",
+        "semver": "^5.6.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        }
+      }
+    },
     "marked": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/marked/-/marked-0.7.0.tgz",
       "integrity": "sha512-c+yYdCZJQrsRjTPhUx7VKkApw9bwDkNbHUKo1ovgcfDjb2kc8rLuRbIFyXL5WOEUwzSSKo3IXpph2K6DqB/KZg=="
     },
+    "merge-source-map": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/merge-source-map/-/merge-source-map-1.1.0.tgz",
+      "integrity": "sha512-Qkcp7P2ygktpMPh2mCQZaf3jhN6D3Z/qVZHSdWvQ+2Ef5HgRAPBO57A77+ENm0CPx2+1Ce/MYKi3ymqdfuqibw==",
+      "dev": true,
+      "requires": {
+        "source-map": "^0.6.1"
+      }
+    },
     "mime-db": {
       "version": "1.42.0",
       "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.42.0.tgz",
@@ -1270,10 +1577,10 @@
       "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=",
       "dev": true
     },
-    "neo-async": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.1.tgz",
-      "integrity": "sha512-iyam8fBuCUpWeKPGpaNMetEocMt364qkCsfL9JuhjXX6dRnguRVOfk2GZaDpPjcOKiiXCPINZC1GczQ7iTq3Zw==",
+    "nested-error-stacks": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/nested-error-stacks/-/nested-error-stacks-2.1.0.tgz",
+      "integrity": "sha512-AO81vsIO1k1sM4Zrd6Hu7regmJN1NSiAja10gc4bX3F0wd+9rQmcuHQaHVQCYIEC8iFXnE+mavh23GOt7wBgug==",
       "dev": true
     },
     "nice-try": {
@@ -1290,13 +1597,33 @@
         "http2-client": "^1.2.5"
       }
     },
-    "nopt": {
-      "version": "3.0.6",
-      "resolved": "https://registry.npmjs.org/nopt/-/nopt-3.0.6.tgz",
-      "integrity": "sha1-xkZdvwirzU2zWTF/eaxopkayj/k=",
+    "normalize-package-data": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/normalize-package-data/-/normalize-package-data-2.5.0.tgz",
+      "integrity": "sha512-/5CMN3T0R4XTj4DcGaexo+roZSdSFW/0AOOTROrjxzCG1wrWXEsGbRKevjlIL+ZDE4sZlJr5ED4YW0yqmkK+eA==",
       "dev": true,
       "requires": {
-        "abbrev": "1"
+        "hosted-git-info": "^2.1.4",
+        "resolve": "^1.10.0",
+        "semver": "2 || 3 || 4 || 5",
+        "validate-npm-package-license": "^3.0.1"
+      },
+      "dependencies": {
+        "resolve": {
+          "version": "1.17.0",
+          "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.17.0.tgz",
+          "integrity": "sha512-ic+7JYiV8Vi2yzQGFWOkiZD5Z9z7O2Zhm9XMaTxdJExKasieFCr+yXZ/WmXsckHiKl12ar0y6XiXDx3m4RHn1w==",
+          "dev": true,
+          "requires": {
+            "path-parse": "^1.0.6"
+          }
+        },
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        }
       }
     },
     "number-is-nan": {
@@ -1304,6 +1631,157 @@
       "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
       "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
     },
+    "nyc": {
+      "version": "14.1.1",
+      "resolved": "https://registry.npmjs.org/nyc/-/nyc-14.1.1.tgz",
+      "integrity": "sha512-OI0vm6ZGUnoGZv/tLdZ2esSVzDwUC88SNs+6JoSOMVxA+gKMB8Tk7jBwgemLx4O40lhhvZCVw1C+OYLOBOPXWw==",
+      "dev": true,
+      "requires": {
+        "archy": "^1.0.0",
+        "caching-transform": "^3.0.2",
+        "convert-source-map": "^1.6.0",
+        "cp-file": "^6.2.0",
+        "find-cache-dir": "^2.1.0",
+        "find-up": "^3.0.0",
+        "foreground-child": "^1.5.6",
+        "glob": "^7.1.3",
+        "istanbul-lib-coverage": "^2.0.5",
+        "istanbul-lib-hook": "^2.0.7",
+        "istanbul-lib-instrument": "^3.3.0",
+        "istanbul-lib-report": "^2.0.8",
+        "istanbul-lib-source-maps": "^3.0.6",
+        "istanbul-reports": "^2.2.4",
+        "js-yaml": "^3.13.1",
+        "make-dir": "^2.1.0",
+        "merge-source-map": "^1.1.0",
+        "resolve-from": "^4.0.0",
+        "rimraf": "^2.6.3",
+        "signal-exit": "^3.0.2",
+        "spawn-wrap": "^1.4.2",
+        "test-exclude": "^5.2.3",
+        "uuid": "^3.3.2",
+        "yargs": "^13.2.2",
+        "yargs-parser": "^13.0.0"
+      },
+      "dependencies": {
+        "cliui": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
+          "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
+          "dev": true,
+          "requires": {
+            "string-width": "^3.1.0",
+            "strip-ansi": "^5.2.0",
+            "wrap-ansi": "^5.1.0"
+          }
+        },
+        "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
+        },
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "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
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "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"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        },
+        "wrap-ansi": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+          "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.0",
+            "string-width": "^3.0.0",
+            "strip-ansi": "^5.0.0"
+          }
+        },
+        "yargs": {
+          "version": "13.3.2",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+          "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
+          "dev": true,
+          "requires": {
+            "cliui": "^5.0.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^2.0.1",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^2.0.0",
+            "set-blocking": "^2.0.0",
+            "string-width": "^3.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^4.0.0",
+            "yargs-parser": "^13.1.2"
+          }
+        },
+        "yargs-parser": {
+          "version": "13.1.2",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+          "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
+    },
     "oas-kit-common": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/oas-kit-common/-/oas-kit-common-1.0.8.tgz",
@@ -1343,24 +1821,6 @@
         "mimic-fn": "^2.1.0"
       }
     },
-    "optimist": {
-      "version": "0.6.1",
-      "resolved": "https://registry.npmjs.org/optimist/-/optimist-0.6.1.tgz",
-      "integrity": "sha1-2j6nRob6IaGaERwybpDrFaAZZoY=",
-      "dev": true,
-      "requires": {
-        "minimist": "~0.0.1",
-        "wordwrap": "~0.0.2"
-      },
-      "dependencies": {
-        "wordwrap": {
-          "version": "0.0.3",
-          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
-          "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
-          "dev": true
-        }
-      }
-    },
     "optionator": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.2.tgz",
@@ -1375,6 +1835,12 @@
         "wordwrap": "~1.0.0"
       }
     },
+    "os-homedir": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
+      "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
+      "dev": true
+    },
     "os-tmpdir": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
@@ -1402,6 +1868,18 @@
       "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
       "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ=="
     },
+    "package-hash": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/package-hash/-/package-hash-3.0.0.tgz",
+      "integrity": "sha512-lOtmukMDVvtkL84rJHI7dpTYq+0rli8N2wlnqUcBuDWCfVhRUfOmnR9SsoHFMLpACvEV60dX7rd0rFaYDZI+FA==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.15",
+        "hasha": "^3.0.0",
+        "lodash.flattendeep": "^4.4.0",
+        "release-zalgo": "^1.0.0"
+      }
+    },
     "parent-module": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
@@ -1421,6 +1899,16 @@
         "is-glob": "^3.1.0"
       }
     },
+    "parse-json": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-4.0.0.tgz",
+      "integrity": "sha1-vjX1Qlvh9/bHRxhPmKeIy5lHfuA=",
+      "dev": true,
+      "requires": {
+        "error-ex": "^1.3.1",
+        "json-parse-better-errors": "^1.0.1"
+      }
+    },
     "path-browserify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-browserify/-/path-browserify-1.0.1.tgz",
@@ -1449,12 +1937,86 @@
       "integrity": "sha1-QRyttXTFoUDTpLGRDUDYDMn0C0A=",
       "dev": true
     },
+    "path-parse": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
+      "integrity": "sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==",
+      "dev": true
+    },
+    "path-type": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/path-type/-/path-type-3.0.0.tgz",
+      "integrity": "sha512-T2ZUsdZFHgA3u4e5PfPbjd7HDDpxPnQb5jN0SrDsjNSuVXHJqtwTnWqG0B1jZrgmJ/7lj1EmVIByWt1gxGkWvg==",
+      "dev": true,
+      "requires": {
+        "pify": "^3.0.0"
+      },
+      "dependencies": {
+        "pify": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+          "dev": true
+        }
+      }
+    },
     "pathval": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.0.tgz",
       "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
       "dev": true
     },
+    "pify": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+      "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
+      "dev": true
+    },
+    "pkg-dir": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-3.0.0.tgz",
+      "integrity": "sha512-/E57AYkoeQ25qkxMj5PBOVgF8Kiu/h7cYS30Z5+R7WaiCCBfLq58ZI/dSeaEKb9WVJV5n/03QwrN3IeWIFllvw==",
+      "dev": true,
+      "requires": {
+        "find-up": "^3.0.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "dev": true
+        }
+      }
+    },
     "postcss": {
       "version": "7.0.27",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.27.tgz",
@@ -1551,6 +2113,63 @@
       "integrity": "sha512-GXpfrYVPwx3K7RQ6aYT8KPS8XViSXUVJT1ONhoKPE9VAleW42YE+U+8VEyGWt41EnEQW7gwecYJriTI0pKoecQ==",
       "dev": true
     },
+    "read-pkg": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-3.0.0.tgz",
+      "integrity": "sha1-nLxoaXj+5l0WwA4rGcI3/Pbjg4k=",
+      "dev": true,
+      "requires": {
+        "load-json-file": "^4.0.0",
+        "normalize-package-data": "^2.3.2",
+        "path-type": "^3.0.0"
+      }
+    },
+    "read-pkg-up": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-4.0.0.tgz",
+      "integrity": "sha512-6etQSH7nJGsK0RbG/2TeDzZFa8shjQ1um+SwQQ5cwKy0dhSXdOncEhb1CPpvQG4h7FyOV6EB6YlV0yJvZQNAkA==",
+      "dev": true,
+      "requires": {
+        "find-up": "^3.0.0",
+        "read-pkg": "^3.0.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "dev": true
+        }
+      }
+    },
     "readable-stream": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
@@ -1577,6 +2196,15 @@
       "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw==",
       "dev": true
     },
+    "release-zalgo": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/release-zalgo/-/release-zalgo-1.0.0.tgz",
+      "integrity": "sha1-CXALflB0Mpc5Mw5TXFqQ+2eFFzA=",
+      "dev": true,
+      "requires": {
+        "es6-error": "^4.0.1"
+      }
+    },
     "require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -1587,12 +2215,6 @@
       "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
       "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg=="
     },
-    "resolve": {
-      "version": "1.1.7",
-      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz",
-      "integrity": "sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=",
-      "dev": true
-    },
     "resolve-from": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
@@ -1740,6 +2362,52 @@
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
       "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
     },
+    "spawn-wrap": {
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/spawn-wrap/-/spawn-wrap-1.4.3.tgz",
+      "integrity": "sha512-IgB8md0QW/+tWqcavuFgKYR/qIRvJkRLPJDFaoXtLLUaVcCDK0+HeFTkmQHj3eprcYhc+gOl0aEA1w7qZlYezw==",
+      "dev": true,
+      "requires": {
+        "foreground-child": "^1.5.6",
+        "mkdirp": "^0.5.0",
+        "os-homedir": "^1.0.1",
+        "rimraf": "^2.6.2",
+        "signal-exit": "^3.0.2",
+        "which": "^1.3.0"
+      }
+    },
+    "spdx-correct": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.1.tgz",
+      "integrity": "sha512-cOYcUWwhCuHCXi49RhFRCyJEK3iPj1Ziz9DpViV3tbZOwXD49QzIN3MpOLJNxh2qwq2lJJZaKMVw9qNi4jTC0w==",
+      "dev": true,
+      "requires": {
+        "spdx-expression-parse": "^3.0.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "spdx-exceptions": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.3.0.tgz",
+      "integrity": "sha512-/tTrYOC7PPI1nUAgx34hUpqXuyJG+DTHJTnIULG4rDygi4xu/tfgmq1e1cIRwRzwZgo4NLySi+ricLkZkw4i5A==",
+      "dev": true
+    },
+    "spdx-expression-parse": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.1.tgz",
+      "integrity": "sha512-cbqHunsQWnJNE6KhVSMsMeH5H/L9EpymbzqTQ3uLwNCLZ1Q481oWaofqH7nO6V07xlXwY6PhQdQ2IedWx/ZK4Q==",
+      "dev": true,
+      "requires": {
+        "spdx-exceptions": "^2.1.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "spdx-license-ids": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
+      "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q==",
+      "dev": true
+    },
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -1806,6 +2474,12 @@
         }
       }
     },
+    "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-json-comments": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
@@ -1872,6 +2546,18 @@
         }
       }
     },
+    "test-exclude": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.3.tgz",
+      "integrity": "sha512-M+oxtseCFO3EDtAaGH7iiej3CBkzXqFMbzqYAACdzKui4eZA+pq3tZEwChvOdNfa7xxy8BfbmgJSIr43cC/+2g==",
+      "dev": true,
+      "requires": {
+        "glob": "^7.1.3",
+        "minimatch": "^3.0.4",
+        "read-pkg-up": "^4.0.0",
+        "require-main-filename": "^2.0.0"
+      }
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -1893,6 +2579,12 @@
         "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",
+      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+      "dev": true
+    },
     "tslib": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
@@ -1920,26 +2612,6 @@
       "integrity": "sha512-DWkS49EQKVX//Tbupb9TFa19c7+MK1XmzkrZUR8TAktmE/DizXoaoJV6TZ/tSIPXipqNiRI6CyAe7x69Jb6RSw==",
       "dev": true
     },
-    "uglify-js": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
-      "integrity": "sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "commander": "~2.20.0",
-        "source-map": "~0.6.1"
-      },
-      "dependencies": {
-        "commander": {
-          "version": "2.20.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
-          "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
-          "dev": true,
-          "optional": true
-        }
-      }
-    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -1958,6 +2630,16 @@
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
       "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ=="
     },
+    "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"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -2040,6 +2722,17 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.3.tgz",
+      "integrity": "sha512-GaETH5wwsX+GcnzhPgKcKjJ6M2Cq3/iZp1WyY/X1CSqrW+jVNM9Y7D8EC2sM4ZG/V8wZlSniJnCKWPmBYAucRQ==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
diff --git a/package.json b/package.json
index b65f18b..0498213 100644
--- a/package.json
+++ b/package.json
@@ -136,7 +136,7 @@
     "eslint-plugin-mocha": "5.2.0",
     "eslint-plugin-security": "1.4.0",
     "expect.js": "0.3.1",
-    "istanbul": "0.4.5",
+    "nyc": "14.1.1",
     "mocha": "5.2.0",
     "parse-gitignore": "0.4.0"
   },
diff --git a/scripts/test-system.sh b/scripts/test-system.sh
index d45a9f1..ad4ed3f 100755
--- a/scripts/test-system.sh
+++ b/scripts/test-system.sh
@@ -28,17 +28,17 @@ echo -en "\033[0m\033[2mmocha `mocha --version`\033[0m";
 # set mocha reporter
 if [ "$CI" = "true" ]; then
   MOCHA_REPORTER="xunit";
-  ISTANBUL_REPORT="--report cobertura";
+  COVERAGE_REPORT="--report cobertura";
 else
   MOCHA_REPORTER="spec";
-  ISTANBUL_REPORT="";
+  COVERAGE_REPORT="";
 fi
 
 # delete old repor directory
 [ -d .coverage ] && rm -rf .coverage && mkdir .coverage;
 
 # run test
-node --max-old-space-size=2048 node_modules/.bin/istanbul cover ${ISTANBUL_REPORT} \
-  --dir ./.coverage -x **/assets/** --print both _mocha -- \
+node --max-old-space-size=2048 ./node_modules/.bin/nyc ${COVERAGE_REPORT} --report-dir ./.coverage \
+  -x **/assets/** --print both ./node_modules/.bin/_mocha \
   --reporter ${MOCHA_REPORTER} --reporter-options output=${XUNIT_FILE} \
-  test/system/*.test.js --recursive --prof --grep "$1";
\ No newline at end of file
+  test/system/*.test.js --recursive --prof --grep "$1";
diff --git a/scripts/test-unit.sh b/scripts/test-unit.sh
index 4985a99..7140dd8 100755
--- a/scripts/test-unit.sh
+++ b/scripts/test-unit.sh
@@ -27,17 +27,17 @@ echo -en "\033[0m\033[2mmocha `mocha --version`\033[0m";
 # set mocha reporter
 if [ "$CI" = "true" ]; then
   MOCHA_REPORTER="xunit";
-  ISTANBUL_REPORT="--report cobertura";
+  COVERAGE_REPORT="--report cobertura";
 else
   MOCHA_REPORTER="spec";
-  ISTANBUL_REPORT="";
+  COVERAGE_REPORT="";
 fi
 
 # delete old repor directory
 [ -d .coverage ] && rm -rf .coverage && mkdir .coverage;
 
 # run test
-node --max-old-space-size=2048 node_modules/.bin/istanbul cover ${ISTANBUL_REPORT} \
-  --dir ./.coverage -x **/assets/** --print both _mocha -- \
+node --max-old-space-size=2048 ./node_modules/.bin/nyc ${COVERAGE_REPORT} --report-dir ./.coverage \
+  -x **/assets/** --print both ./node_modules/.bin/_mocha \
   --reporter ${MOCHA_REPORTER} --reporter-options output=${XUNIT_FILE} \
   test/unit/*.test.js --recursive --prof --grep "$1";