diff --git a/.babelrc b/.babelrc
deleted file mode 100644
index d714f78..0000000
--- a/.babelrc
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "presets": ["@babel/env"],
-  "env": {
-    "test": {
-      "plugins": ["./lib"]
-    }
-  }
-}
diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 0000000..f8ab39d
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,12 @@
+'use strict'
+
+module.exports = {
+  plugins: [
+    '@babel/plugin-transform-modules-commonjs'
+  ],
+  env: {
+    test: {
+      plugins: ['./lib']
+    }
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index 04dcb15..cd60b3b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,9 +5,9 @@
   "requires": true,
   "dependencies": {
     "@babel/cli": {
-      "version": "7.4.3",
-      "resolved": "https://registry.npmjs.org/@babel/cli/-/cli-7.4.3.tgz",
-      "integrity": "sha512-cbC5H9iTDV9H7sMxK5rUm18UbdVPNTPqgdzmQAkOUP3YLysgDWLZaysVAfylK49rgTlzL01a6tXyq9rCb3yLhQ==",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/cli/-/cli-7.4.4.tgz",
+      "integrity": "sha512-XGr5YjQSjgTa6OzQZY57FAJsdeVSAKR/u/KA5exWIz66IKtv/zXtHy+fIZcMry/EgYegwuHE7vzGnrFhjdIAsQ==",
       "dev": true,
       "requires": {
         "chokidar": "^2.0.4",
@@ -31,18 +31,18 @@
       }
     },
     "@babel/core": {
-      "version": "7.4.3",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.4.3.tgz",
-      "integrity": "sha512-oDpASqKFlbspQfzAE7yaeTmdljSH2ADIvBlb0RwbStltTuWa0+7CCI1fYVINNv9saHPa1W7oaKeuNuKj+RQCvA==",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.4.4.tgz",
+      "integrity": "sha512-lQgGX3FPRgbz2SKmhMtYgJvVzGZrmjaF4apZ2bLwofAKiSjxU0drPh4S/VasyYXwaTs+A1gvQ45BN8SQJzHsQQ==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "@babel/generator": "^7.4.0",
-        "@babel/helpers": "^7.4.3",
-        "@babel/parser": "^7.4.3",
-        "@babel/template": "^7.4.0",
-        "@babel/traverse": "^7.4.3",
-        "@babel/types": "^7.4.0",
+        "@babel/generator": "^7.4.4",
+        "@babel/helpers": "^7.4.4",
+        "@babel/parser": "^7.4.4",
+        "@babel/template": "^7.4.4",
+        "@babel/traverse": "^7.4.4",
+        "@babel/types": "^7.4.4",
         "convert-source-map": "^1.1.0",
         "debug": "^4.1.0",
         "json5": "^2.1.0",
@@ -61,68 +61,17 @@
       }
     },
     "@babel/generator": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
-      "integrity": "sha512-/v5I+a1jhGSKLgZDcmAUZ4K/VePi43eRkUs3yePW1HB1iANOD5tqJXwGSG4BZhSksP8J9ejSlwGeTiiOFZOrXQ==",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.4.tgz",
+      "integrity": "sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==",
       "requires": {
-        "@babel/types": "^7.4.0",
+        "@babel/types": "^7.4.4",
         "jsesc": "^2.5.1",
         "lodash": "^4.17.11",
         "source-map": "^0.5.0",
         "trim-right": "^1.0.1"
       }
     },
-    "@babel/helper-annotate-as-pure": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0.tgz",
-      "integrity": "sha512-3UYcJUj9kvSLbLbUIfQTqzcy5VX7GRZ/CCDrnOaZorFFM01aXp1+GJwuFGV4NDDoAS+mOUyHcO6UD/RfqOks3Q==",
-      "dev": true,
-      "requires": {
-        "@babel/types": "^7.0.0"
-      }
-    },
-    "@babel/helper-builder-binary-assignment-operator-visitor": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-builder-binary-assignment-operator-visitor/-/helper-builder-binary-assignment-operator-visitor-7.1.0.tgz",
-      "integrity": "sha512-qNSR4jrmJ8M1VMM9tibvyRAHXQs2PmaksQF7c1CGJNipfe3D8p+wgNwgso/P2A2r2mdgBWAXljNWR0QRZAMW8w==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-explode-assignable-expression": "^7.1.0",
-        "@babel/types": "^7.0.0"
-      }
-    },
-    "@babel/helper-call-delegate": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-call-delegate/-/helper-call-delegate-7.4.0.tgz",
-      "integrity": "sha512-SdqDfbVdNQCBp3WhK2mNdDvHd3BD6qbmIc43CAyjnsfCmgHMeqgDcM3BzY2lchi7HBJGJ2CVdynLWbezaE4mmQ==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-hoist-variables": "^7.4.0",
-        "@babel/traverse": "^7.4.0",
-        "@babel/types": "^7.4.0"
-      }
-    },
-    "@babel/helper-define-map": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-define-map/-/helper-define-map-7.4.0.tgz",
-      "integrity": "sha512-wAhQ9HdnLIywERVcSvX40CEJwKdAa1ID4neI9NXQPDOHwwA+57DqwLiPEVy2AIyWzAk0CQ8qx4awO0VUURwLtA==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-function-name": "^7.1.0",
-        "@babel/types": "^7.4.0",
-        "lodash": "^4.17.11"
-      }
-    },
-    "@babel/helper-explode-assignable-expression": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-explode-assignable-expression/-/helper-explode-assignable-expression-7.1.0.tgz",
-      "integrity": "sha512-NRQpfHrJ1msCHtKjbzs9YcMmJZOg6mQMmGRB+hbamEdG5PNpaSm95275VD92DvJKuyl0s2sFiDmMZ+EnnvufqA==",
-      "dev": true,
-      "requires": {
-        "@babel/traverse": "^7.1.0",
-        "@babel/types": "^7.0.0"
-      }
-    },
     "@babel/helper-function-name": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
@@ -141,24 +90,6 @@
         "@babel/types": "^7.0.0"
       }
     },
-    "@babel/helper-hoist-variables": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.4.0.tgz",
-      "integrity": "sha512-/NErCuoe/et17IlAQFKWM24qtyYYie7sFIrW/tIQXpck6vAu2hhtYYsKLBWQV+BQZMbcIYPU/QMYuTufrY4aQw==",
-      "dev": true,
-      "requires": {
-        "@babel/types": "^7.4.0"
-      }
-    },
-    "@babel/helper-member-expression-to-functions": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.0.0.tgz",
-      "integrity": "sha512-avo+lm/QmZlv27Zsi0xEor2fKcqWG56D5ae9dzklpIaY7cQMK5N8VSpaNVPPagiqmy7LrEjK1IWdGMOqPu5csg==",
-      "dev": true,
-      "requires": {
-        "@babel/types": "^7.0.0"
-      }
-    },
     "@babel/helper-module-imports": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.0.0.tgz",
@@ -169,67 +100,23 @@
       }
     },
     "@babel/helper-module-transforms": {
-      "version": "7.4.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.4.3.tgz",
-      "integrity": "sha512-H88T9IySZW25anu5uqyaC1DaQre7ofM+joZtAaO2F8NBdFfupH0SZ4gKjgSFVcvtx/aAirqA9L9Clio2heYbZA==",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.4.4.tgz",
+      "integrity": "sha512-3Z1yp8TVQf+B4ynN7WoHPKS8EkdTbgAEy0nU0rs/1Kw4pDgmvYH3rz3aI11KgxKCba2cn7N+tqzV1mY2HMN96w==",
       "dev": true,
       "requires": {
         "@babel/helper-module-imports": "^7.0.0",
         "@babel/helper-simple-access": "^7.1.0",
-        "@babel/helper-split-export-declaration": "^7.0.0",
-        "@babel/template": "^7.2.2",
-        "@babel/types": "^7.2.2",
+        "@babel/helper-split-export-declaration": "^7.4.4",
+        "@babel/template": "^7.4.4",
+        "@babel/types": "^7.4.4",
         "lodash": "^4.17.11"
       }
     },
-    "@babel/helper-optimise-call-expression": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.0.0.tgz",
-      "integrity": "sha512-u8nd9NQePYNQV8iPWu/pLLYBqZBa4ZaY1YWRFMuxrid94wKI1QNt67NEZ7GAe5Kc/0LLScbim05xZFWkAdrj9g==",
-      "dev": true,
-      "requires": {
-        "@babel/types": "^7.0.0"
-      }
-    },
     "@babel/helper-plugin-utils": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz",
-      "integrity": "sha512-CYAOUCARwExnEixLdB6sDm2dIJ/YgEAKDM1MOeMeZu9Ld/bDgVo8aiWrXwcY7OBh+1Ea2uUcVRcxKk0GJvW7QA==",
-      "dev": true
-    },
-    "@babel/helper-regex": {
-      "version": "7.4.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-regex/-/helper-regex-7.4.3.tgz",
-      "integrity": "sha512-hnoq5u96pLCfgjXuj8ZLX3QQ+6nAulS+zSgi6HulUwFbEruRAKwbGLU5OvXkE14L8XW6XsQEKsIDfgthKLRAyA==",
-      "dev": true,
-      "requires": {
-        "lodash": "^4.17.11"
-      }
-    },
-    "@babel/helper-remap-async-to-generator": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-remap-async-to-generator/-/helper-remap-async-to-generator-7.1.0.tgz",
-      "integrity": "sha512-3fOK0L+Fdlg8S5al8u/hWE6vhufGSn0bN09xm2LXMy//REAF8kDCrYoOBKYmA8m5Nom+sV9LyLCwrFynA8/slg==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-annotate-as-pure": "^7.0.0",
-        "@babel/helper-wrap-function": "^7.1.0",
-        "@babel/template": "^7.1.0",
-        "@babel/traverse": "^7.1.0",
-        "@babel/types": "^7.0.0"
-      }
-    },
-    "@babel/helper-replace-supers": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.4.0.tgz",
-      "integrity": "sha512-PVwCVnWWAgnal+kJ+ZSAphzyl58XrFeSKSAJRiqg5QToTsjL+Xu1f9+RJ+d+Q0aPhPfBGaYfkox66k86thxNSg==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-member-expression-to-functions": "^7.0.0",
-        "@babel/helper-optimise-call-expression": "^7.0.0",
-        "@babel/traverse": "^7.4.0",
-        "@babel/types": "^7.4.0"
-      }
+      "integrity": "sha512-CYAOUCARwExnEixLdB6sDm2dIJ/YgEAKDM1MOeMeZu9Ld/bDgVo8aiWrXwcY7OBh+1Ea2uUcVRcxKk0GJvW7QA=="
     },
     "@babel/helper-simple-access": {
       "version": "7.1.0",
@@ -242,34 +129,22 @@
       }
     },
     "@babel/helper-split-export-declaration": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.0.tgz",
-      "integrity": "sha512-7Cuc6JZiYShaZnybDmfwhY4UYHzI6rlqhWjaIqbsJGsIqPimEYy5uh3akSRLMg65LSdSEnJ8a8/bWQN6u2oMGw==",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
+      "integrity": "sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==",
       "requires": {
-        "@babel/types": "^7.4.0"
-      }
-    },
-    "@babel/helper-wrap-function": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-wrap-function/-/helper-wrap-function-7.2.0.tgz",
-      "integrity": "sha512-o9fP1BZLLSrYlxYEYyl2aS+Flun5gtjTIG8iln+XuEzQTs0PLagAGSXUcqruJwD5fM48jzIEggCKpIfWTcR7pQ==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-function-name": "^7.1.0",
-        "@babel/template": "^7.1.0",
-        "@babel/traverse": "^7.1.0",
-        "@babel/types": "^7.2.0"
+        "@babel/types": "^7.4.4"
       }
     },
     "@babel/helpers": {
-      "version": "7.4.3",
-      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.4.3.tgz",
-      "integrity": "sha512-BMh7X0oZqb36CfyhvtbSmcWc3GXocfxv3yNsAEuM0l+fAqSO22rQrUpijr3oE/10jCTrB6/0b9kzmG4VetCj8Q==",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.4.4.tgz",
+      "integrity": "sha512-igczbR/0SeuPR8RFfC7tGrbdTbFL3QTvH6D+Z6zNxnTe//GyqmtHmDkzrqDmyZ3eSwPqB/LhyKoU5DXsp+Vp2A==",
       "dev": true,
       "requires": {
-        "@babel/template": "^7.4.0",
-        "@babel/traverse": "^7.4.3",
-        "@babel/types": "^7.4.0"
+        "@babel/template": "^7.4.4",
+        "@babel/traverse": "^7.4.4",
+        "@babel/types": "^7.4.4"
       }
     },
     "@babel/highlight": {
@@ -283,471 +158,25 @@
       }
     },
     "@babel/parser": {
-      "version": "7.4.3",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.3.tgz",
-      "integrity": "sha512-gxpEUhTS1sGA63EGQGuA+WESPR/6tz6ng7tSHFCmaTJK/cGK8y37cBTspX+U2xCAue2IQVvF6Z0oigmjwD8YGQ=="
-    },
-    "@babel/plugin-proposal-async-generator-functions": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-async-generator-functions/-/plugin-proposal-async-generator-functions-7.2.0.tgz",
-      "integrity": "sha512-+Dfo/SCQqrwx48ptLVGLdE39YtWRuKc/Y9I5Fy0P1DDBB9lsAHpjcEJQt+4IifuSOSTLBKJObJqMvaO1pIE8LQ==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-plugin-utils": "^7.0.0",
-        "@babel/helper-remap-async-to-generator": "^7.1.0",
-        "@babel/plugin-syntax-async-generators": "^7.2.0"
-      }
-    },
-    "@babel/plugin-proposal-json-strings": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-json-strings/-/plugin-proposal-json-strings-7.2.0.tgz",
-      "integrity": "sha512-MAFV1CA/YVmYwZG0fBQyXhmj0BHCB5egZHCKWIFVv/XCxAeVGIHfos3SwDck4LvCllENIAg7xMKOG5kH0dzyUg==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-plugin-utils": "^7.0.0",
-        "@babel/plugin-syntax-json-strings": "^7.2.0"
-      }
-    },
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-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.4.3.tgz",
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-      "version": "0.5.0",
-      "resolved": "https://registry.npmjs.org/regjsgen/-/regjsgen-0.5.0.tgz",
-      "integrity": "sha512-RnIrLhrXCX5ow/E5/Mh2O4e/oa1/jW0eaBKTSy3LaCj+M3Bqvm97GWDp2yUtzIs4LEn65zR2yiYGFqb2ApnzDA==",
-      "dev": true
-    },
-    "regjsparser": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/regjsparser/-/regjsparser-0.6.0.tgz",
-      "integrity": "sha512-RQ7YyokLiQBomUJuUG8iGVvkgOLxwyZM8k6d3q5SAXpg4r5TZJZigKFvC6PpD+qQ98bCDC5YelPeA3EucDoNeQ==",
-      "dev": true,
-      "requires": {
-        "jsesc": "~0.5.0"
-      },
-      "dependencies": {
-        "jsesc": {
-          "version": "0.5.0",
-          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
-          "integrity": "sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0=",
-          "dev": true
-        }
-      }
-    },
     "release-zalgo": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/release-zalgo/-/release-zalgo-1.0.0.tgz",
@@ -6835,9 +6132,9 @@
       "dev": true
     },
     "uglify-js": {
-      "version": "3.5.8",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.5.8.tgz",
-      "integrity": "sha512-GFSjB1nZIzoIq70qvDRtWRORHX3vFkAnyK/rDExc0BN7r9+/S+Voz3t/fwJuVfjppAMz+ceR2poE7tkhvnVwQQ==",
+      "version": "3.5.12",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.5.12.tgz",
+      "integrity": "sha512-KeQesOpPiZNgVwJj8Ge3P4JYbQHUdZzpx6Fahy6eKAYRSV4zhVmLXoC+JtOeYxcHCHTve8RG1ZGdTvpeOUM26Q==",
       "dev": true,
       "optional": true,
       "requires": {
@@ -6854,34 +6151,6 @@
         }
       }
     },
-    "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": "1.1.0",
-      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.1.0.tgz",
-      "integrity": "sha512-hDTHvaBk3RmFzvSl0UVrUmC3PuW9wKVnpoUDYH0JDkSIovzw+J5viQmeYHxVSBptubnr7PbH2e0fnpDRQnQl5g==",
-      "dev": true
-    },
-    "unicode-property-aliases-ecmascript": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.5.tgz",
-      "integrity": "sha512-L5RAqCfXqAwR3RriF8pM0lU0w4Ryf/GgzONwi6KnL1taJQa7x1TCxdJnILX59WIGOwR57IVxn7Nej0fz1Ny6fw==",
-      "dev": true
-    },
     "union-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
diff --git a/package.json b/package.json
index 5e1697b..fbd701c 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
     "lib"
   ],
   "dependencies": {
+    "@babel/helper-plugin-utils": "^7.0.0",
     "find-up": "^3.0.0",
     "istanbul-lib-instrument": "^3.3.0",
     "test-exclude": "^5.2.3"
@@ -17,7 +18,6 @@
     "@babel/cli": "^7.4.3",
     "@babel/core": "^7.4.3",
     "@babel/plugin-transform-modules-commonjs": "^7.4.3",
-    "@babel/preset-env": "^7.4.3",
     "@babel/register": "^7.4.0",
     "chai": "^4.2.0",
     "coveralls": "^3.0.3",
diff --git a/src/index.js b/src/index.js
index 8843650..44fba93 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,5 +1,6 @@
 import { realpathSync } from 'fs'
 import { dirname } from 'path'
+import { declare } from '@babel/helper-plugin-utils'
 import { programVisitor } from 'istanbul-lib-instrument'
 
 const testExclude = require('test-exclude')
@@ -48,7 +49,10 @@ function makeShouldSkip () {
   }
 }
 
-function makeVisitor ({ types: t }) {
+export default declare(api => {
+  api.assertVersion(7)
+
+  const t = api.types
   const shouldSkip = makeShouldSkip()
   return {
     visitor: {
@@ -83,6 +87,4 @@ function makeVisitor ({ types: t }) {
       }
     }
   }
-}
-
-export default makeVisitor
+})
diff --git a/test/babel-plugin-istanbul.js b/test/babel-plugin-istanbul.js
index 4f87999..5abcafd 100644
--- a/test/babel-plugin-istanbul.js
+++ b/test/babel-plugin-istanbul.js
@@ -11,7 +11,7 @@ describe('babel-plugin-istanbul', function () {
     it('should instrument file if shouldSkip returns false', function () {
       var result = babel.transformFileSync('./fixtures/plugin-should-cover.js', {
         plugins: [
-          [makeVisitor({ types: babel.types }), {
+          [makeVisitor, {
             include: ['fixtures/plugin-should-cover.js']
           }]
         ]
@@ -22,7 +22,7 @@ describe('babel-plugin-istanbul', function () {
     it('should not instrument file if shouldSkip returns true', function () {
       var result = babel.transformFileSync('./fixtures/plugin-should-not-cover.js', {
         plugins: [
-          [makeVisitor({ types: babel.types }), {
+          [makeVisitor, {
             include: ['fixtures/plugin-should-cover.js']
           }]
         ]
@@ -34,7 +34,7 @@ describe('babel-plugin-istanbul', function () {
       var args
       babel.transformFileSync('./fixtures/plugin-should-cover.js', {
         plugins: [
-          [makeVisitor({ types: babel.types }), {
+          [makeVisitor, {
             onCover: function () {
               args = [].slice.call(arguments)
             },
@@ -51,7 +51,7 @@ describe('babel-plugin-istanbul', function () {
     it('should use inline source map', function () {
       var result = babel.transformFileSync('./fixtures/has-inline-source-map.js', {
         plugins: [
-          [makeVisitor({ types: babel.types }), {
+          [makeVisitor, {
             include: ['fixtures/has-inline-source-map.js']
           }]
         ]
@@ -62,7 +62,7 @@ describe('babel-plugin-istanbul', function () {
     it('should not use inline source map if inputSourceMap is set to false', function () {
       var result = babel.transformFileSync('./fixtures/has-inline-source-map.js', {
         plugins: [
-          [makeVisitor({ types: babel.types }), {
+          [makeVisitor, {
             include: ['fixtures/has-inline-source-map.js'],
             useInlineSourceMaps: false
           }]
@@ -74,7 +74,7 @@ describe('babel-plugin-istanbul', function () {
     it('should use provided source map', function () {
       var result = babel.transformFileSync('./fixtures/has-inline-source-map.js', {
         plugins: [
-          [makeVisitor({ types: babel.types }), {
+          [makeVisitor, {
             include: ['fixtures/has-inline-source-map.js'],
             inputSourceMap: { asdfQwer: 'foo' }
           }]
@@ -89,7 +89,7 @@ describe('babel-plugin-istanbul', function () {
       it('should instrument file if shouldSkip returns false', function () {
         var result = babel.transformFileSync('./fixtures/should-cover.js', {
           plugins: [
-            makeVisitor({ types: babel.types })
+            makeVisitor
           ]
         })
         result.code.should.match(/statementMap/)
@@ -98,7 +98,7 @@ describe('babel-plugin-istanbul', function () {
       it('should not instrument file if shouldSkip returns true', function () {
         var result = babel.transformFileSync('./fixtures/should-not-cover.js', {
           plugins: [
-            makeVisitor({ types: babel.types })
+            makeVisitor
           ]
         })
         result.code.should.not.match(/statementMap/)
@@ -117,7 +117,7 @@ describe('babel-plugin-istanbul', function () {
       it('should instrument file if shouldSkip returns false', function () {
         var result = babel.transformFileSync('./fixtures/should-cover.js', {
           plugins: [
-            makeVisitor({ types: babel.types })
+            makeVisitor
           ]
         })
         result.code.should.match(/statementMap/)
@@ -126,7 +126,7 @@ describe('babel-plugin-istanbul', function () {
       it('should not instrument file if shouldSkip returns true', function () {
         var result = babel.transformFileSync('./fixtures/should-not-cover.js', {
           plugins: [
-            makeVisitor({ types: babel.types })
+            makeVisitor
           ]
         })
         result.code.should.not.match(/statementMap/)
@@ -141,7 +141,7 @@ describe('babel-plugin-istanbul', function () {
     it('should instrument: export const foo = () => {}', function () {
       var result = babel.transformFileSync('./fixtures/issue-78.js', {
         plugins: [
-          [makeVisitor({ types: babel.types }), {
+          [makeVisitor, {
             include: ['fixtures/issue-78.js']
           }]
         ]
@@ -153,7 +153,7 @@ describe('babel-plugin-istanbul', function () {
     it('should not conflict with transform-modules-commonjs', function () {
       var result = babel.transformFileSync('./fixtures/issue-201.js', {
         plugins: [
-          [makeVisitor({ types: babel.types }), {
+          [makeVisitor, {
             include: ['fixtures/issue-201.js']
           }],
           '@babel/plugin-transform-modules-commonjs'