diff --git a/.babelrc b/.babelrc
index f8a0424..a0b096a 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,9 +1,14 @@
 {
-  "presets": ["es2015-loose", "stage-0"],
-  "plugins": ["add-module-exports", "precompile-charcodes"],
-  "env": {
-    "development": {
-      "sourceMaps": "inline"
+    "presets": [
+        ["@babel/preset-env", { "loose": true }]
+    ],
+    "plugins": [
+        "@babel/proposal-class-properties",
+        "add-module-exports"
+    ],
+    "env": {
+        "development": {
+            "sourceMaps": "inline"
+        }
     }
-  }
 }
diff --git a/package-lock.json b/package-lock.json
index 31c2e03..7db5830 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,59 +5,34 @@
   "requires": true,
   "dependencies": {
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-      "resolved": "https://registry.npmjs.org/@ava/babel-plugin-throws-helper/-/babel-plugin-throws-helper-2.0.0.tgz",
-      "integrity": "sha1-L8H+PCEacQcaTsp7j3r1hCzRrnw=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@ava/babel-plugin-throws-helper/-/babel-plugin-throws-helper-3.0.0.tgz",
+      "integrity": "sha512-mN9UolOs4WX09QkheU1ELkVy2WPnwonlO3XMdN8JF8fQqRVgVTR21xDbvEOUsbwz6Zwjq7ji9yzyjuXqDPalxg==",
       "dev": true
     },
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-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/@ava/babel-preset-stage-4/-/babel-preset-stage-4-1.1.0.tgz",
-      "integrity": "sha512-oWqTnIGXW3k72UFidXzW0ONlO7hnO9x02S/QReJ7NBGeiBH9cUHY9+EfV6C8PXC6YJH++WrliEq03wMSJGNZFg==",
-      "dev": true,
-      "requires": {
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-        "babel-plugin-syntax-trailing-function-commas": "^6.20.0",
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-        "babel-plugin-transform-es2015-function-name": "^6.9.0",
-        "babel-plugin-transform-es2015-modules-commonjs": "^6.18.0",
-        "babel-plugin-transform-es2015-parameters": "^6.21.0",
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-        "babel-plugin-transform-es2015-unicode-regex": "^6.11.0",
-        "babel-plugin-transform-exponentiation-operator": "^6.8.0",
-        "package-hash": "^1.2.0"
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-          "resolved": "https://registry.npmjs.org/md5-hex/-/md5-hex-1.3.0.tgz",
-          "integrity": "sha1-0sSv6YPENwZiF5uMrRRSGRNQRsQ=",
-          "dev": true,
-          "requires": {
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-          }
-        },
-        "package-hash": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/package-hash/-/package-hash-1.2.0.tgz",
-          "integrity": "sha1-AD5WzVe3NqbtYRTMK4FUJnJ3DkQ=",
-          "dev": true,
-          "requires": {
-            "md5-hex": "^1.3.0"
-          }
-        }
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@ava/babel-preset-stage-4/-/babel-preset-stage-4-2.0.0.tgz",
+      "integrity": "sha512-OWqMYeTSZ16AfLx0Vn0Uj7tcu+uMRlbKmks+DVCFlln7vomVsOtst+Oz+HCussDSFGpE+30VtHAUHLy6pLDpHQ==",
+      "dev": true,
+      "requires": {
+        "@babel/plugin-proposal-async-generator-functions": "^7.0.0",
+        "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
+        "@babel/plugin-proposal-optional-catch-binding": "^7.0.0",
+        "@babel/plugin-transform-async-to-generator": "^7.0.0",
+        "@babel/plugin-transform-dotall-regex": "^7.0.0",
+        "@babel/plugin-transform-exponentiation-operator": "^7.0.0",
+        "@babel/plugin-transform-modules-commonjs": "^7.0.0"
       }
     },
     "@ava/babel-preset-transform-test-files": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/@ava/babel-preset-transform-test-files/-/babel-preset-transform-test-files-3.0.0.tgz",
-      "integrity": "sha1-ze0RlqjY2TgaUJJAq5LpGl7Aafc=",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@ava/babel-preset-transform-test-files/-/babel-preset-transform-test-files-4.0.1.tgz",
+      "integrity": "sha512-D7Z92B8Rgsj35JZveKJGwpUDuBKLiRKH6eyKpNmDHy7TJjr8y3VSDr3bUK+O456F3SkkBXrUihQuMrr39nWQhQ==",
       "dev": true,
       "requires": {
-        "@ava/babel-plugin-throws-helper": "^2.0.0",
-        "babel-plugin-espower": "^2.3.2"
+        "@ava/babel-plugin-throws-helper": "^3.0.0",
+        "babel-plugin-espower": "^3.0.1"
       }
     },
     "@ava/write-file-atomic": {
@@ -71,1526 +46,1227 @@
         "slide": "^1.1.5"
       }
     },
+    "@babel/cli": {
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/@babel/cli/-/cli-7.2.3.tgz",
+      "integrity": "sha512-bfna97nmJV6nDJhXNPeEfxyMjWnt6+IjUAaDPiYRTBlm8L41n8nvw6UAqUCbvpFfU246gHPxW7sfWwqtF4FcYA==",
+      "dev": true,
+      "requires": {
+        "chokidar": "^2.0.3",
+        "commander": "^2.8.1",
+        "convert-source-map": "^1.1.0",
+        "fs-readdir-recursive": "^1.1.0",
+        "glob": "^7.0.0",
+        "lodash": "^4.17.10",
+        "mkdirp": "^0.5.1",
+        "output-file-sync": "^2.0.0",
+        "slash": "^2.0.0",
+        "source-map": "^0.5.0"
+      }
+    },
     "@babel/code-frame": {
-      "version": "7.0.0-beta.44",
-      "resolved": "http://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.44.tgz",
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+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
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       "dev": true,
       "requires": {
-        "@babel/highlight": "7.0.0-beta.44"
+        "@babel/highlight": "^7.0.0"
       }
     },
-    "@babel/generator": {
-      "version": "7.0.0-beta.44",
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+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.3.3.tgz",
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           }
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-              }
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+            "spdx-license-ids": "^3.0.0"
           }
         },
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           "bundled": true,
           "dev": true
         },
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           }
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           "bundled": true,
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-              }
-            }
+            "arrify": "^1.0.1",
+            "minimatch": "^3.0.4",
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+            "require-main-filename": "^1.0.1"
           }
         },
-        "unset-value": {
-          "version": "1.0.0",
+        "uglify-js": {
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           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
-            "has-value": "^0.3.1",
-            "isobject": "^3.0.0"
+            "commander": "~2.17.1",
+            "source-map": "~0.6.1"
           },
           "dependencies": {
-            "has-value": {
-              "version": "0.3.1",
+            "source-map": {
+              "version": "0.6.1",
               "bundled": true,
               "dev": true,
-              "requires": {
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-              "dev": true
-            },
-            "isobject": {
-              "version": "3.0.1",
-              "bundled": true,
-              "dev": true
+              "optional": true
             }
           }
         },
-        "urix": {
-          "version": "0.1.0",
+        "uuid": {
+          "version": "3.3.2",
           "bundled": true,
           "dev": true
         },
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-          "bundled": true,
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-              "dev": true
-            }
-          }
-        },
         "validate-npm-package-license": {
-          "version": "3.0.3",
+          "version": "3.0.4",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -7428,7 +5640,7 @@
           }
         },
         "which": {
-          "version": "1.3.0",
+          "version": "1.3.1",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -7440,12 +5652,6 @@
           "bundled": true,
           "dev": true
         },
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-          "dev": true,
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         "wordwrap": {
           "version": "0.0.3",
           "bundled": true,
@@ -7460,6 +5666,11 @@
             "strip-ansi": "^3.0.1"
           },
           "dependencies": {
+            "ansi-regex": {
+              "version": "2.1.1",
+              "bundled": true,
+              "dev": true
+            },
             "is-fullwidth-code-point": {
               "version": "1.0.0",
               "bundled": true,
@@ -7477,6 +5688,14 @@
                 "is-fullwidth-code-point": "^1.0.0",
                 "strip-ansi": "^3.0.0"
               }
+            },
+            "strip-ansi": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "ansi-regex": "^2.0.0"
+              }
             }
           }
         },
@@ -7486,17 +5705,17 @@
           "dev": true
         },
         "write-file-atomic": {
-          "version": "1.3.4",
+          "version": "2.4.2",
           "bundled": true,
           "dev": true,
           "requires": {
             "graceful-fs": "^4.1.11",
             "imurmurhash": "^0.1.4",
-            "slide": "^1.1.5"
+            "signal-exit": "^3.0.2"
           }
         },
         "y18n": {
-          "version": "3.2.1",
+          "version": "4.0.0",
           "bundled": true,
           "dev": true
         },
@@ -7506,75 +5725,31 @@
           "dev": true
         },
         "yargs": {
-          "version": "11.1.0",
+          "version": "12.0.5",
           "bundled": true,
           "dev": true,
           "requires": {
             "cliui": "^4.0.0",
-            "decamelize": "^1.1.1",
-            "find-up": "^2.1.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
             "get-caller-file": "^1.0.1",
-            "os-locale": "^2.0.0",
+            "os-locale": "^3.0.0",
             "require-directory": "^2.1.1",
             "require-main-filename": "^1.0.1",
             "set-blocking": "^2.0.0",
             "string-width": "^2.0.0",
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-                "strip-ansi": "^4.0.0",
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-              "bundled": true,
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-              "requires": {
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-              "bundled": true,
-              "dev": true,
-              "requires": {
-                "camelcase": "^4.1.0"
-              }
-            }
+            "y18n": "^3.2.1 || ^4.0.0",
+            "yargs-parser": "^11.1.1"
           }
         },
         "yargs-parser": {
-          "version": "8.1.0",
+          "version": "11.1.1",
           "bundled": true,
           "dev": true,
           "requires": {
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+          }
+        }
       }
     },
     "to-regex": {
@@ -9316,17 +7115,6 @@
       "requires": {
         "is-number": "^3.0.0",
         "repeat-string": "^1.6.1"
-      },
-      "dependencies": {
-        "is-number": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/is-number/-/is-number-3.0.0.tgz",
-          "integrity": "sha1-JP1iAaR4LPUFYcgQJ2r8fRLXEZU=",
-          "dev": true,
-          "requires": {
-            "kind-of": "^3.0.2"
-          }
-        }
       }
     },
     "tough-cookie": {
@@ -9337,12 +7125,20 @@
       "requires": {
         "psl": "^1.1.24",
         "punycode": "^1.4.1"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+          "dev": true
+        }
       }
     },
     "trim-newlines": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
-      "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-2.0.0.tgz",
+      "integrity": "sha1-tAPQuRvlDDMd/EuC7s6yLD3hbSA=",
       "dev": true
     },
     "trim-off-newlines": {
@@ -9357,6 +7153,12 @@
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "tslib": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
+      "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ==",
+      "dev": true
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -9381,18 +7183,40 @@
         "prelude-ls": "~1.1.2"
       }
     },
-    "typedarray": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
-      "dev": true
-    },
     "uid2": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/uid2/-/uid2-0.0.3.tgz",
       "integrity": "sha1-SDEm4Rd03y9xuLY53NeZw3YWK4I=",
       "dev": true
     },
+    "unicode-canonical-property-names-ecmascript": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-jDrNnXWHd4oHiTZnx/ZG7gtUTVp+gCcTTKr8L0HjlwphROEW3+Him+IpvC+xcJEFegapiMZyZe02CyuOnRmbnQ==",
+      "dev": true
+    },
+    "unicode-match-property-ecmascript": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-ecmascript/-/unicode-match-property-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-L4Qoh15vTfntsn4P1zqnHulG0LdXgjSO035fEpdtp6YxXhMT51Q6vgM5lYdG/5X3MjS+k/Y9Xw4SFCY9IkR0rg==",
+      "dev": true,
+      "requires": {
+        "unicode-canonical-property-names-ecmascript": "^1.0.4",
+        "unicode-property-aliases-ecmascript": "^1.0.4"
+      }
+    },
+    "unicode-match-property-value-ecmascript": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.0.2.tgz",
+      "integrity": "sha512-Rx7yODZC1L/T8XKo/2kNzVAQaRE88AaMvI1EF/Xnj3GW2wzN6fop9DDWuFAKUVFH7vozkz26DzP0qyWLKLIVPQ==",
+      "dev": true
+    },
+    "unicode-property-aliases-ecmascript": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-2WSLa6OdYd2ng8oqiGIWnJqyFArvhn+5vgx5GTxMbUYjCYKUcuKS62YLFF0R/BDGlB1yzXjQOLtPAfHsgirEpg==",
+      "dev": true
+    },
     "union-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
@@ -9490,12 +7314,6 @@
           "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
           "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
           "dev": true
-        },
-        "isobject": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
-          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
-          "dev": true
         }
       }
     },
@@ -9505,6 +7323,12 @@
       "integrity": "sha1-0vD3N9FrBhXnKmk17QQhRXLVb5c=",
       "dev": true
     },
+    "upath": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/upath/-/upath-1.1.0.tgz",
+      "integrity": "sha512-bzpH/oBhoS/QI/YtbkqCg6VEiPYjSZtrHQM6/QnJS6OL9pKUFLqb3aFh4Scvwm45+7iAgiMkLhSbaZxUqmrprw==",
+      "dev": true
+    },
     "update-notifier": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-2.5.0.tgz",
@@ -9521,6 +7345,32 @@
         "latest-version": "^3.0.0",
         "semver-diff": "^2.0.0",
         "xdg-basedir": "^3.0.0"
+      },
+      "dependencies": {
+        "ci-info": {
+          "version": "1.6.0",
+          "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-1.6.0.tgz",
+          "integrity": "sha512-vsGdkwSCDpWmP80ncATX7iea5DWQemg1UgCW5J8tqjU3lYw4FBYuj89J0CTVomA7BEfvSZd84GmHko+MxFQU2A==",
+          "dev": true
+        },
+        "is-ci": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-1.2.1.tgz",
+          "integrity": "sha512-s6tfsaQaQi3JNciBH6shVqEDvhGut0SUXr31ag8Pd8BBbVVlcGfWhpPmEOoM6RJ5TFhbypvf5yyRw/VXW1IiWg==",
+          "dev": true,
+          "requires": {
+            "ci-info": "^1.5.0"
+          }
+        }
+      }
+    },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
       }
     },
     "urix": {
@@ -9544,12 +7394,6 @@
       "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
       "dev": true
     },
-    "user-home": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/user-home/-/user-home-1.1.1.tgz",
-      "integrity": "sha1-K1viOjK2Onyd640PKNSFcko98ZA=",
-      "dev": true
-    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -9562,15 +7406,6 @@
       "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
       "dev": true
     },
-    "v8flags": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-2.1.1.tgz",
-      "integrity": "sha1-qrGh+jDUX4jdMhFIh1rALAtV5bQ=",
-      "dev": true,
-      "requires": {
-        "user-home": "^1.1.1"
-      }
-    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -9592,10 +7427,19 @@
         "extsprintf": "^1.2.0"
       }
     },
+    "wcwidth": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
+      "integrity": "sha1-8LDc+RW8X/FSivrbLA4XtTLaL+g=",
+      "dev": true,
+      "requires": {
+        "defaults": "^1.0.3"
+      }
+    },
     "well-known-symbols": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/well-known-symbols/-/well-known-symbols-1.0.0.tgz",
-      "integrity": "sha1-c8eK6Bp3Jqj6WY4ogIAcixYiVRg=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/well-known-symbols/-/well-known-symbols-2.0.0.tgz",
+      "integrity": "sha512-ZMjC3ho+KXo0BfJb7JgtQ5IBuvnShdlACNkKkdsqBmYw3bPAaJfPeYUo6tLUaT5tG/Gkh7xkpBhKRQ9e7pyg9Q==",
       "dev": true
     },
     "which": {
@@ -9629,18 +7473,18 @@
       "dev": true
     },
     "write": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
       }
     },
     "write-file-atomic": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
-      "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
+      "integrity": "sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==",
       "dev": true,
       "requires": {
         "graceful-fs": "^4.1.11",
@@ -9648,44 +7492,6 @@
         "signal-exit": "^3.0.2"
       }
     },
-    "write-json-file": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/write-json-file/-/write-json-file-2.3.0.tgz",
-      "integrity": "sha1-K2TIozAE1UuGmMdtWFp3zrYdoy8=",
-      "dev": true,
-      "requires": {
-        "detect-indent": "^5.0.0",
-        "graceful-fs": "^4.1.2",
-        "make-dir": "^1.0.0",
-        "pify": "^3.0.0",
-        "sort-keys": "^2.0.0",
-        "write-file-atomic": "^2.0.0"
-      },
-      "dependencies": {
-        "detect-indent": {
-          "version": "5.0.0",
-          "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-5.0.0.tgz",
-          "integrity": "sha1-OHHMCmoALow+Wzz38zYmRnXwa50=",
-          "dev": true
-        },
-        "pify": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
-          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
-          "dev": true
-        }
-      }
-    },
-    "write-pkg": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/write-pkg/-/write-pkg-3.2.0.tgz",
-      "integrity": "sha512-tX2ifZ0YqEFOF1wjRW2Pk93NLsj02+n1UP5RvO6rCs0K6R2g1padvf006cY74PQJKMGS2r42NK7FD0dG6Y6paw==",
-      "dev": true,
-      "requires": {
-        "sort-keys": "^2.0.0",
-        "write-json-file": "^2.2.0"
-      }
-    },
     "xdg-basedir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
@@ -9703,6 +7509,15 @@
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
+    },
+    "yargs-parser": {
+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
+      "integrity": "sha512-VCIyR1wJoEBZUqk5PA+oOBF6ypbwh5aNB3I50guxAL/quggdfs4TtNHQrSazFA3fYZ+tEqfs0zIGlv0c/rgjbQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^4.1.0"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 23e7416..4e04778 100644
--- a/package.json
+++ b/package.json
@@ -2,25 +2,23 @@
   "name": "postcss-selector-parser",
   "version": "5.0.0",
   "devDependencies": {
-    "ava": "^0.25.0",
-    "babel-cli": "^6.26.0",
-    "babel-core": "^6.26.3",
-    "babel-eslint": "^8.2.3",
-    "babel-plugin-add-module-exports": "^0.2.0",
-    "babel-plugin-precompile-charcodes": "^1.1.0",
-    "babel-preset-es2015": "^6.24.1",
-    "babel-preset-es2015-loose": "^7.0.0",
-    "babel-preset-stage-0": "^6.24.1",
-    "babel-register": "^6.26.0",
+    "@babel/cli": "^7.2.3",
+    "@babel/core": "^7.3.3",
+    "@babel/plugin-proposal-class-properties": "^7.3.3",
+    "@babel/preset-env": "^7.3.1",
+    "@babel/register": "^7.0.0",
+    "ava": "^1.2.1",
+    "babel-eslint": "^10.0.1",
+    "babel-plugin-add-module-exports": "^1.0.0",
     "coveralls": "^3.0.2",
     "del-cli": "^1.1.0",
-    "eslint": "^4.19.1",
-    "eslint-plugin-babel": "^3.3.0",
+    "eslint": "^5.14.1",
+    "eslint-plugin-babel": "^5.3.0",
     "eslint-plugin-import": "^2.14.0",
     "glob": "^7.1.3",
     "minimist": "^1.2.0",
-    "nyc": "^11.7.3",
-    "postcss": "^7.0.7",
+    "nyc": "^13.3.0",
+    "postcss": "^7.0.14",
     "semver": "^5.6.0"
   },
   "main": "dist/index.js",
@@ -64,7 +62,9 @@
   ],
   "repository": "postcss/postcss-selector-parser",
   "ava": {
-    "require": "babel-register",
+    "require": [
+      "@babel/register"
+    ],
     "concurrency": 5
   },
   "nyc": {
diff --git a/src/__tests__/__snapshots__/postcss.js.md b/src/__tests__/__snapshots__/postcss.js.md
index 019fa66..17426a8 100644
--- a/src/__tests__/__snapshots__/postcss.js.md
+++ b/src/__tests__/__snapshots__/postcss.js.md
@@ -124,16 +124,6 @@ Generated by [AVA](https://ava.li).
         |  ^␊
     `
 
-## bad whitespace instead of namespace token
-
-> Snapshot 1
-
-    `CssSyntaxError: <css input>:1:2: Expected an attribute, found "  " instead.␊
-    ␊
-    > 1 | [  |href=test] {}␊
-        |  ^␊
-    `
-
 ## missing open parenthesis
 
 > Snapshot 1
diff --git a/src/__tests__/__snapshots__/postcss.js.snap b/src/__tests__/__snapshots__/postcss.js.snap
index a66f12b..e64222d 100644
Binary files a/src/__tests__/__snapshots__/postcss.js.snap and b/src/__tests__/__snapshots__/postcss.js.snap differ
diff --git a/src/__tests__/combinators.js b/src/__tests__/combinators.js
index 6e3e0f9..7c0dbf4 100644
--- a/src/__tests__/combinators.js
+++ b/src/__tests__/combinators.js
@@ -115,7 +115,7 @@ test('multiple combinators with whitespaces', 'h1 + h2 > h3', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[3].value, '>', 'should have a combinator');
 });
 
-test('multiple combinators with whitespaces', 'h1+ h2 >h3', (t, tree) => {
+test('multiple combinators with whitespaces (2)', 'h1+ h2 >h3', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[1].value, '+', 'should have a combinator');
     t.deepEqual(tree.nodes[0].nodes[3].value, '>', 'should have a combinator');
 });
diff --git a/src/__tests__/comments.js b/src/__tests__/comments.js
index f60ec41..b842b6b 100644
--- a/src/__tests__/comments.js
+++ b/src/__tests__/comments.js
@@ -5,7 +5,7 @@ test('comments', '/*test comment*/h2', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[1].value, 'h2');
 });
 
-test('comments', '.a  /*test comment*/label', (t, tree) => {
+test('comments (2)', '.a  /*test comment*/label', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[0].type, 'class');
     t.deepEqual(tree.nodes[0].nodes[1].type, 'combinator');
     t.deepEqual(tree.nodes[0].nodes[1].value, ' ');
@@ -14,7 +14,7 @@ test('comments', '.a  /*test comment*/label', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[2].type, 'tag');
 });
 
-test('comments', '.a  /*test comment*/  label', (t, tree) => {
+test('comments (3)', '.a  /*test comment*/  label', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[0].type, 'class');
     t.deepEqual(tree.nodes[0].nodes[1].type, 'combinator');
     t.deepEqual(tree.nodes[0].nodes[1].value, ' ');
diff --git a/src/__tests__/exceptions.js b/src/__tests__/exceptions.js
index e74185d..9ea8621 100644
--- a/src/__tests__/exceptions.js
+++ b/src/__tests__/exceptions.js
@@ -21,6 +21,6 @@ throws('missing closing parenthesis in pseudo', ':not([attr="test"]:not([attr="t
 throws('bad syntax', '-moz-osx-font-smoothing: grayscale');
 
 throws('missing backslash for semicolon', '.;');
-throws('missing backslash for semicolon', '.\;');
+throws('missing backslash for semicolon (2)', '.\;');
 throws('unexpected / foo', '-Option\/root', "Unexpected '/'. Escaping special characters with \\ may help.");
 throws('bang in selector', '.foo !optional', "Unexpected '!'. Escaping special characters with \\ may help.");
diff --git a/src/__tests__/nonstandard.js b/src/__tests__/nonstandard.js
index e657846..686def8 100644
--- a/src/__tests__/nonstandard.js
+++ b/src/__tests__/nonstandard.js
@@ -24,7 +24,7 @@ test('sass escapes', '.#{$classname}', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[0].value, "#{$classname}");
 });
 
-test('sass escapes', '[lang=#{$locale}]', (t, tree) => {
+test('sass escapes (2)', '[lang=#{$locale}]', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes.map(n => n.type), ["attribute"]);
     t.deepEqual(tree.nodes[0].nodes[0].value, "#{$locale}");
 });
diff --git a/src/__tests__/util/helpers.js b/src/__tests__/util/helpers.js
index f97ad70..a470cef 100644
--- a/src/__tests__/util/helpers.js
+++ b/src/__tests__/util/helpers.js
@@ -33,7 +33,7 @@ test.serial = (spec, input, callback) => test(spec, input, callback, false, fals
 
 export const throws = (spec, input, validator) => {
     ava(`${spec} (throws)`, t => {
-        t.throws(() => parser().processSync(input), validator);
+        t.throws(() => parser().processSync(input), validator || Error);
     });
 };
 
diff --git a/src/tokenTypes.js b/src/tokenTypes.js
index 0f35114..bbf20ea 100644
--- a/src/tokenTypes.js
+++ b/src/tokenTypes.js
@@ -1,31 +1,31 @@
-export const ampersand        = `&`.charCodeAt(0);
-export const asterisk         = `*`.charCodeAt(0);
-export const at               = `@`.charCodeAt(0);
-export const comma            = `,`.charCodeAt(0);
-export const colon            = `:`.charCodeAt(0);
-export const semicolon        = `;`.charCodeAt(0);
-export const openParenthesis  = `(`.charCodeAt(0);
-export const closeParenthesis = `)`.charCodeAt(0);
-export const openSquare       = `[`.charCodeAt(0);
-export const closeSquare      = `]`.charCodeAt(0);
-export const dollar           = `$`.charCodeAt(0);
-export const tilde            = `~`.charCodeAt(0);
-export const caret            = `^`.charCodeAt(0);
-export const plus             = `+`.charCodeAt(0);
-export const equals           = `=`.charCodeAt(0);
-export const pipe             = `|`.charCodeAt(0);
-export const greaterThan      = `>`.charCodeAt(0);
-export const space            = ` `.charCodeAt(0);
-export const singleQuote      = `'`.charCodeAt(0);
-export const doubleQuote      = `"`.charCodeAt(0);
-export const slash            = `/`.charCodeAt(0);
-export const bang             = `!`.charCodeAt(0);
+export const ampersand        = 38; // `&`.charCodeAt(0);
+export const asterisk         = 42; // `*`.charCodeAt(0);
+export const at               = 64; // `@`.charCodeAt(0);
+export const comma            = 44; // `,`.charCodeAt(0);
+export const colon            = 58; // `:`.charCodeAt(0);
+export const semicolon        = 59; // `;`.charCodeAt(0);
+export const openParenthesis  = 40; // `(`.charCodeAt(0);
+export const closeParenthesis = 41; // `)`.charCodeAt(0);
+export const openSquare       = 91; // `[`.charCodeAt(0);
+export const closeSquare      = 93; // `]`.charCodeAt(0);
+export const dollar           = 36; // `$`.charCodeAt(0);
+export const tilde            = 126; // `~`.charCodeAt(0);
+export const caret            = 94; // `^`.charCodeAt(0);
+export const plus             = 43; // `+`.charCodeAt(0);
+export const equals           = 61; // `=`.charCodeAt(0);
+export const pipe             = 124; // `|`.charCodeAt(0);
+export const greaterThan      = 62; // `>`.charCodeAt(0);
+export const space            = 32; // ` `.charCodeAt(0);
+export const singleQuote      = 39; // `'`.charCodeAt(0);
+export const doubleQuote      = 34; // `"`.charCodeAt(0);
+export const slash            = 47; // `/`.charCodeAt(0);
+export const bang             = 33; // `!`.charCodeAt(0);
 
-export const backslash        = '\\'.charCodeAt(0);
-export const cr               = '\r'.charCodeAt(0);
-export const feed             = '\f'.charCodeAt(0);
-export const newline          = '\n'.charCodeAt(0);
-export const tab              = '\t'.charCodeAt(0);
+export const backslash        = 92; // '\\'.charCodeAt(0);
+export const cr               = 13; // '\r'.charCodeAt(0);
+export const feed             = 12; // '\f'.charCodeAt(0);
+export const newline          = 10; // '\n'.charCodeAt(0);
+export const tab              = 9; // '\t'.charCodeAt(0);
 
 // Expose aliases primarily for readability.
 export const str              = singleQuote;