diff --git a/.babelrc b/.babelrc
deleted file mode 100644
index 93b531c..0000000
--- a/.babelrc
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "env": {
-    "esm": {
-      "presets": ["github"]
-    },
-    "umd": {
-      "plugins": [
-        "@babel/plugin-transform-modules-umd"
-      ],
-      "presets": ["github"]
-    }
-  }
-}
diff --git a/README.md b/README.md
index 21c2e5d..00475eb 100644
--- a/README.md
+++ b/README.md
@@ -59,8 +59,8 @@ Use `label[tabindex="0"][role=menuitemradio/menuitemcheckbox]` when dealing with
 
 ### Events
 
-- `details-menu-select` (cancelable) - fired on `<details-menu>` with `event.detail.relatedTarget` being the item to be select.
-- `details-menu-selected` - fired on `<details-menu>` with `event.detail.relatedTarget` being the item selected, after label is updated and menu is closed.
+- `details-menu-select` (cancelable) - fired on `<details-menu>` with `event.relatedTarget` being the item to be select.
+- `details-menu-selected` - fired on `<details-menu>` with `event.relatedTarget` being the item selected, after label is updated and menu is closed.
 
 ### Deferred loading
 
diff --git a/index.js.flow b/index.js.flow
deleted file mode 100644
index 9c1c1e6..0000000
--- a/index.js.flow
+++ /dev/null
@@ -1,12 +0,0 @@
-/* @flow strict */
-
-declare class DetailsMenuElement extends HTMLElement {
-  get preload(): boolean;
-  set preload(value: boolean): void;
-  get src(): string;
-  set src(url: string): void;
-}
-
-declare module '@github/details-menu-element' {
-  declare export default typeof DetailsMenuElement
-}
diff --git a/package-lock.json b/package-lock.json
index 18f468c..efd7ad2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,24 +4,6 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "@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",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
@@ -836,6 +818,27 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@types/estree": {
+      "version": "0.0.39",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
+      "integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "11.13.4",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-11.13.4.tgz",
+      "integrity": "sha512-+rabAZZ3Yn7tF/XPGHupKIL5EcAbrLxnTr/hgQICxbeuAfWtT0UZSfULE+ndusckBItcv4o6ZeOJplQikVcLvQ==",
+      "dev": true
+    },
+    "@types/resolve": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/@types/resolve/-/resolve-0.0.8.tgz",
+      "integrity": "sha512-auApPaJf3NPfe18hSoJkp8EbZzer2ISk7o8mCC3M9he/a04+gbMF97NkpD2S8riMGvm4BMRI59/SZQSaLTKpsQ==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@typescript-eslint/eslint-plugin": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-1.4.0.tgz",
@@ -877,13 +880,6 @@
         }
       }
     },
-    "abbrev": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
-      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
-      "dev": true,
-      "optional": true
-    },
     "accepts": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
@@ -930,13 +926,6 @@
       "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
       "dev": true
     },
-    "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true,
-      "optional": true
-    },
     "ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
@@ -954,31 +943,23 @@
       "requires": {
         "micromatch": "^3.1.4",
         "normalize-path": "^2.1.1"
-      }
-    },
-    "aproba": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
-      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
-      "dev": true,
-      "optional": true
-    },
-    "are-we-there-yet": {
-      "version": "1.1.5",
-      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
-      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "delegates": "^1.0.0",
-        "readable-stream": "^2.0.6"
+      },
+      "dependencies": {
+        "normalize-path": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
+          "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
+          "dev": true,
+          "requires": {
+            "remove-trailing-separator": "^1.0.1"
+          }
+        }
       }
     },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
       "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
-      "dev": true,
       "requires": {
         "sprintf-js": "~1.0.2"
       }
@@ -1021,12 +1002,6 @@
         "es-abstract": "^1.7.0"
       }
     },
-    "array-slice": {
-      "version": "0.2.3",
-      "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-0.2.3.tgz",
-      "integrity": "sha1-3Tz7gO15c6dRF82sabC5nshhhvU=",
-      "dev": true
-    },
     "array-unique": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
@@ -1063,10 +1038,19 @@
       "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
       "dev": true
     },
+    "async": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.2.tgz",
+      "integrity": "sha512-H1qVYh1MYhEEFLsP97cVKqCGo7KfCyTt6uEWqsTBr9SO84oK9Uwbyd/yCW+6rKJLHksBNUVWZDAjfS+Ccx0Bbg==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.11"
+      }
+    },
     "async-each": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
-      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.2.tgz",
+      "integrity": "sha512-6xrbvN0MOBKSJDdonmSSz2OwFSgxRaVtBDes26mj9KIGtDo+g9xosFRSC+i1gQh2oAN/tQ62AI/pGZGQjVOiRg==",
       "dev": true
     },
     "async-limiter": {
@@ -1225,9 +1209,9 @@
       }
     },
     "binary-extensions": {
-      "version": "1.12.0",
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.12.0.tgz",
-      "integrity": "sha512-DYWGk01lDcxeS/K9IHPGWfT8PsJmbXRtRd2Sx72Tnb8pcYZQFF1oSDb8hJtS1vhp212q1Rzi5dUf9+nq0o9UIg==",
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
+      "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==",
       "dev": true
     },
     "blob": {
@@ -1237,9 +1221,9 @@
       "dev": true
     },
     "bluebird": {
-      "version": "3.5.3",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.3.tgz",
-      "integrity": "sha512-/qKPUQlaW1OyR51WeCPBvRnAlnZFUJkCSG5HzGnuIqhgyJtF+T94lFnn33eiazjRm2LAHVy2guNnaq48X9SJuw==",
+      "version": "3.5.4",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.4.tgz",
+      "integrity": "sha512-FG+nFEZChJrbQ9tIccIfZJBz3J7mLrAhxakAbnrJWn8d7aKOC+LWifa0G+p4ZqKp4y13T7juYvdhq9NzKdsrjw==",
       "dev": true
     },
     "body-parser": {
@@ -1349,6 +1333,12 @@
       "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw=",
       "dev": true
     },
+    "builtin-modules": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-3.1.0.tgz",
+      "integrity": "sha512-k0KL0aWZuBt2lrxrcASWDfwOLMnodeQjodT/1SxEQAXsHANgo6ZC/VEaSEHCXt7aSTZ4/4H5LKa+tBXmW7Vtvw==",
+      "dev": true
+    },
     "bytes": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
@@ -1428,33 +1418,25 @@
       "dev": true
     },
     "chokidar": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.0.4.tgz",
-      "integrity": "sha512-z9n7yt9rOvIJrMhvDtDictKrkFHeihkNl6uWMmZlmL6tJtX9Cs+87oK+teBx+JIgzvbX3yZHT3eF8vpbDxHJXQ==",
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.5.tgz",
+      "integrity": "sha512-i0TprVWp+Kj4WRPtInjexJ8Q+BqTE909VpH8xVhXrJkoc5QC8VO9TryGOqTr+2hljzc1sC62t22h5tZePodM/A==",
       "dev": true,
       "requires": {
         "anymatch": "^2.0.0",
-        "async-each": "^1.0.0",
-        "braces": "^2.3.0",
-        "fsevents": "^1.2.2",
+        "async-each": "^1.0.1",
+        "braces": "^2.3.2",
+        "fsevents": "^1.2.7",
         "glob-parent": "^3.1.0",
-        "inherits": "^2.0.1",
+        "inherits": "^2.0.3",
         "is-binary-path": "^1.0.0",
         "is-glob": "^4.0.0",
-        "lodash.debounce": "^4.0.8",
-        "normalize-path": "^2.1.1",
+        "normalize-path": "^3.0.0",
         "path-is-absolute": "^1.0.0",
-        "readdirp": "^2.0.0",
-        "upath": "^1.0.5"
+        "readdirp": "^2.2.1",
+        "upath": "^1.1.1"
       }
     },
-    "chownr": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.1.tgz",
-      "integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g==",
-      "dev": true,
-      "optional": true
-    },
     "circular-json": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
@@ -1499,13 +1481,6 @@
       "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
       "dev": true
     },
-    "code-point-at": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
-      "dev": true,
-      "optional": true
-    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -1537,15 +1512,6 @@
       "integrity": "sha512-mmGt/1pZqYRjMxB1axhTo16/snVZ5krrKkcmMeVKxzECMMXoCgnvTPp10QgHfcbQZw8Dq2jMNG6je4JlWU0gWg==",
       "dev": true
     },
-    "combine-lists": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/combine-lists/-/combine-lists-1.0.1.tgz",
-      "integrity": "sha1-RYwH4J4NkA/Ci3Cj/sLazR0st/Y=",
-      "dev": true,
-      "requires": {
-        "lodash": "^4.5.0"
-      }
-    },
     "commander": {
       "version": "2.19.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.19.0.tgz",
@@ -1588,13 +1554,6 @@
         "utils-merge": "1.0.1"
       }
     },
-    "console-control-strings": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
-      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
-      "dev": true,
-      "optional": true
-    },
     "contains-path": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/contains-path/-/contains-path-0.1.0.tgz",
@@ -1676,9 +1635,9 @@
       "dev": true
     },
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-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/date-format/-/date-format-1.2.0.tgz",
-      "integrity": "sha1-YV6CjiM90aubua4JUODOzPpuytg=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/date-format/-/date-format-2.0.0.tgz",
+      "integrity": "sha512-M6UqVvZVgFYqZL1SfHsRGIQSz3ZL+qgbsV5Lp1Vj61LZVYuEwcMXYay7DRDtYs2HQQBK5hQtQ0fD9aEJ89V0LA==",
       "dev": true
     },
     "debug": {
@@ -1705,13 +1664,6 @@
         "type-detect": "^4.0.0"
       }
     },
-    "deep-extend": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
-      "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==",
-      "dev": true,
-      "optional": true
-    },
     "deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
@@ -1768,26 +1720,12 @@
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       }
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-    "delegates": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
-      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
-      "dev": true,
-      "optional": true
-    },
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       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
       "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak=",
       "dev": true
     },
-    "detect-libc": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-1.0.3.tgz",
-      "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=",
-      "dev": true,
-      "optional": true
-    },
     "di": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/di/-/di-0.0.1.tgz",
@@ -2271,8 +2209,7 @@
     "esprima": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
-      "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==",
-      "dev": true
+      "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A=="
     },
     "esquery": {
       "version": "1.0.1",
@@ -2298,6 +2235,12 @@
       "integrity": "sha1-De4/7TH81GlhjOc0IJn8GvoL2xM=",
       "dev": true
     },
+    "estree-walker": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-0.6.0.tgz",
+      "integrity": "sha512-peq1RfVAVzr3PU/jL31RaOjUKLoZJpObQWJJ+LgfcxDUifyLZ1RjPQZTl0pzj2uJ45b7A7XpyppXvxdEqzo4rw==",
+      "dev": true
+    },
     "esutils": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
@@ -2310,34 +2253,6 @@
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       "dev": true
     },
-    "expand-braces": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/expand-braces/-/expand-braces-0.1.2.tgz",
-      "integrity": "sha1-SIsdHSRRyz06axks/AMPRMWFX+o=",
-      "dev": true,
-      "requires": {
-        "array-slice": "^0.2.3",
-        "array-unique": "^0.2.1",
-        "braces": "^0.1.2"
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-      "dependencies": {
-        "array-unique": {
-          "version": "0.2.1",
-          "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
-          "integrity": "sha1-odl8yvy8JiXMcPrc6zalDFiwGlM=",
-          "dev": true
-        },
-        "braces": {
-          "version": "0.1.5",
-          "resolved": "https://registry.npmjs.org/braces/-/braces-0.1.5.tgz",
-          "integrity": "sha1-wIVxEIUpHYt1/ddOqw+FlygHEeY=",
-          "dev": true,
-          "requires": {
-            "expand-range": "^0.1.0"
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-      }
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     "expand-brackets": {
       "version": "2.1.4",
       "resolved": "https://registry.npmjs.org/expand-brackets/-/expand-brackets-2.1.4.tgz",
@@ -2373,30 +2288,6 @@
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-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/expand-range/-/expand-range-0.1.1.tgz",
-      "integrity": "sha1-TLjtoJk8pW+k9B/ELzy7TMrf8EQ=",
-      "dev": true,
-      "requires": {
-        "is-number": "^0.1.1",
-        "repeat-string": "^0.2.2"
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-      "dependencies": {
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+          "version": "1.10.0",
+          "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.10.0.tgz",
+          "integrity": "sha512-3sUr9aq5OfSg2S9pNtPA9hL1FVEAjvfOC4leW0SNf/mpnaakz2a9femSd6LqAww2RaFctwyf1lCqnTHuF1rxDg==",
+          "dev": true,
+          "requires": {
+            "path-parse": "^1.0.6"
+          }
+        }
+      }
+    },
+    "rollup-pluginutils": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-2.6.0.tgz",
+      "integrity": "sha512-aGQwspEF8oPKvg37u3p7h0cYNwmJR1sCBMZGZ5b9qy8HGtETknqjzcxrDRrcAnJNXN18lBH4Q9vZYth/p4n8jQ==",
+      "dev": true,
+      "requires": {
+        "estree-walker": "^0.6.0",
+        "micromatch": "^3.1.10"
+      }
+    },
     "run-async": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.3.0.tgz",
@@ -4823,26 +5070,12 @@
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
       "dev": true
     },
-    "sax": {
-      "version": "1.2.4",
-      "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
-      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
-      "dev": true,
-      "optional": true
-    },
     "semver": {
       "version": "5.6.0",
       "resolved": "https://registry.npmjs.org/semver/-/semver-5.6.0.tgz",
       "integrity": "sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==",
       "dev": true
     },
-    "set-blocking": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
-      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
-      "dev": true,
-      "optional": true
-    },
     "set-value": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.0.tgz",
@@ -4893,12 +5126,6 @@
       "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
       "dev": true
     },
-    "slash": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/slash/-/slash-2.0.0.tgz",
-      "integrity": "sha512-ZYKh3Wh2z1PpEXWr0MpSBZ0V6mZHAQfYevttO11c51CaWjGTaadiKZ+wVt1PbMlDV5qhMFslpZCemhwOK7C89A==",
-      "dev": true
-    },
     "slice-ansi": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-2.0.0.tgz",
@@ -5186,8 +5413,7 @@
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
-      "dev": true
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
     },
     "static-extend": {
       "version": "0.1.2",
@@ -5217,15 +5443,16 @@
       "dev": true
     },
     "streamroller": {
-      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/streamroller/-/streamroller-0.7.0.tgz",
-      "integrity": "sha512-WREzfy0r0zUqp3lGO096wRuUp7ho1X6uo/7DJfTlEi0Iv/4gT7YHqXDjKC2ioVGBZtE8QzsQD9nx1nIuoZ57jQ==",
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/streamroller/-/streamroller-1.0.4.tgz",
+      "integrity": "sha512-Wc2Gm5ygjSX8ZpW9J7Y9FwiSzTlKSvcl0FTTMd3rn7RoxDXpBW+xD9TY5sWL2n0UR61COB0LG1BQvN6nTUQbLQ==",
       "dev": true,
       "requires": {
-        "date-format": "^1.2.0",
+        "async": "^2.6.1",
+        "date-format": "^2.0.0",
         "debug": "^3.1.0",
-        "mkdirp": "^0.5.1",
-        "readable-stream": "^2.3.0"
+        "fs-extra": "^7.0.0",
+        "lodash": "^4.17.10"
       },
       "dependencies": {
         "debug": {
@@ -5245,18 +5472,6 @@
         }
       }
     },
-    "string-width": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-      "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "code-point-at": "^1.0.0",
-        "is-fullwidth-code-point": "^1.0.0",
-        "strip-ansi": "^3.0.0"
-      }
-    },
     "string_decoder": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
@@ -5266,16 +5481,6 @@
         "safe-buffer": "~5.1.0"
       }
     },
-    "strip-ansi": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-      "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "ansi-regex": "^2.0.0"
-      }
-    },
     "strip-bom": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
@@ -5348,22 +5553,6 @@
         }
       }
     },
-    "tar": {
-      "version": "4.4.8",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.8.tgz",
-      "integrity": "sha512-LzHF64s5chPQQS0IYBn9IN5h3i98c12bo4NCO7e0sGM2llXQ3p2FGC5sdENN4cTW48O915Sh+x+EXx7XW96xYQ==",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "chownr": "^1.1.1",
-        "fs-minipass": "^1.2.5",
-        "minipass": "^2.3.4",
-        "minizlib": "^1.1.1",
-        "mkdirp": "^0.5.0",
-        "safe-buffer": "^5.1.2",
-        "yallist": "^3.0.2"
-      }
-    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -5554,6 +5743,12 @@
         }
       }
     },
+    "universalify": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+      "dev": true
+    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -5601,9 +5796,9 @@
       }
     },
     "upath": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/upath/-/upath-1.1.0.tgz",
-      "integrity": "sha512-bzpH/oBhoS/QI/YtbkqCg6VEiPYjSZtrHQM6/QnJS6OL9pKUFLqb3aFh4Scvwm45+7iAgiMkLhSbaZxUqmrprw==",
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/upath/-/upath-1.1.2.tgz",
+      "integrity": "sha512-kXpym8nmDmlCBr7nKdIx8P2jNBa+pBpIUFRnKJ4dr8htyYGJFokkr2ZvERRtUN+9SY+JqXouNgUPtv6JQva/2Q==",
       "dev": true
     },
     "uri-js": {
@@ -5680,16 +5875,6 @@
         "isexe": "^2.0.0"
       }
     },
-    "wide-align": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
-      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "string-width": "^1.0.2 || 2"
-      }
-    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -5729,11 +5914,10 @@
       "dev": true
     },
     "yallist": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
-      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
-      "dev": true,
-      "optional": true
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
     },
     "yeast": {
       "version": "0.1.2",
diff --git a/package.json b/package.json
index 6857beb..331e65b 100644
--- a/package.json
+++ b/package.json
@@ -17,28 +17,27 @@
     "clean": "rm -rf dist",
     "lint": "github-lint",
     "prebuild": "npm run clean && npm run lint && mkdir dist",
-    "build-umd": "BABEL_ENV=umd babel index.js -o dist/index.umd.js && cp index.js.flow dist/index.umd.js.flow",
-    "build-esm": "BABEL_ENV=esm babel index.js -o dist/index.esm.js && cp index.js.flow dist/index.esm.js.flow",
-    "build": "npm run build-umd && npm run build-esm",
+    "build": "rollup -c && cp src/index.js.flow dist/index.esm.js.flow && cp src/index.js.flow dist/index.umd.js.flow",
     "pretest": "npm run build",
     "test": "karma start test/karma.config.js",
     "prepublishOnly": "npm run build"
   },
   "devDependencies": {
-    "@babel/cli": "^7.2.3",
     "@babel/core": "^7.2.2",
-    "@babel/plugin-transform-modules-umd": "^7.2.0",
     "babel-preset-github": "^2.1.2",
     "chai": "^4.2.0",
     "eslint": "^5.12.0",
     "eslint-plugin-github": "^1.9.0",
     "flow-bin": "^0.90.0",
-    "karma": "^4.0.0",
+    "karma": "^4.0.1",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.5",
-    "mocha": "^5.0.5"
+    "mocha": "^5.0.5",
+    "rollup": "^1.10.0",
+    "rollup-plugin-babel": "^4.3.2",
+    "rollup-plugin-node-resolve": "^4.2.3"
   },
   "eslintIgnore": [
     "dist/"
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..01638d3
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,28 @@
+/* @flow strict */
+
+import babel from 'rollup-plugin-babel'
+import resolve from 'rollup-plugin-node-resolve'
+
+const pkg = require('./package.json')
+
+export default {
+  input: 'src/index.js',
+  output: [
+    {
+      file: pkg['module'],
+      format: 'es'
+    },
+    {
+      file: pkg['main'],
+      format: 'umd',
+      name: 'DetailsMenuElement',
+      exports: 'named'
+    }
+  ],
+  plugins: [
+    resolve(),
+    babel({
+      presets: ['github']
+    })
+  ]
+}
diff --git a/src/details-menu-event.js b/src/details-menu-event.js
new file mode 100644
index 0000000..8f2286d
--- /dev/null
+++ b/src/details-menu-event.js
@@ -0,0 +1,16 @@
+/* @flow strict */
+
+type DetailsMenuType = 'details-menu-select' | 'details-menu-selected'
+
+type DetailsMenu$Init = CustomEvent$Init & {
+  relatedTarget: Element
+}
+
+export default class DetailsMenuEvent extends CustomEvent {
+  relatedTarget: Element
+
+  constructor(type: DetailsMenuType, init: DetailsMenu$Init) {
+    super(type, init)
+    this.relatedTarget = init.relatedTarget
+  }
+}
diff --git a/index.js b/src/index.js
similarity index 96%
rename from index.js
rename to src/index.js
index c92770c..7e068eb 100644
--- a/index.js
+++ b/src/index.js
@@ -1,4 +1,6 @@
 /* @flow strict */
+import DetailsMenuEvent from './details-menu-event'
+export {default as DetailsMenuEvent} from './details-menu-event'
 
 class DetailsMenuElement extends HTMLElement {
   constructor() {
@@ -189,9 +191,9 @@ function commit(selected: Element, details: Element) {
   if (!menu) return
 
   const dispatched = menu.dispatchEvent(
-    new CustomEvent('details-menu-select', {
+    new DetailsMenuEvent('details-menu-select', {
       cancelable: true,
-      detail: {relatedTarget: selected}
+      relatedTarget: selected
     })
   )
   if (!dispatched) return
@@ -200,8 +202,8 @@ function commit(selected: Element, details: Element) {
   updateChecked(selected, details)
   if (selected.getAttribute('role') !== 'menuitemcheckbox') close(details)
   menu.dispatchEvent(
-    new CustomEvent('details-menu-selected', {
-      detail: {relatedTarget: selected}
+    new DetailsMenuEvent('details-menu-selected', {
+      relatedTarget: selected
     })
   )
 }
diff --git a/src/index.js.flow b/src/index.js.flow
new file mode 100644
index 0000000..89abdcf
--- /dev/null
+++ b/src/index.js.flow
@@ -0,0 +1,20 @@
+/* @flow strict */
+
+declare module '@github/details-menu-element' {
+  declare export default class DetailsMenuElement extends HTMLElement {
+    get preload(): boolean;
+    set preload(value: boolean): void;
+    get src(): string;
+    set src(url: string): void;
+  }
+  declare type DetailsMenuEventType = 'details-menu-select' | 'details-menu-selected'
+
+  declare type DetailsMenuEvent$Init = CustomEvent$Init & {
+    relatedTarget: Element
+  }
+
+  declare export class DetailsMenuEvent extends CustomEvent {
+    relatedTarget: Element;
+    constructor(type: DetailsMenuEventType, init: DetailsMenuEvent$Init): void;
+  }
+}
diff --git a/test/test.js b/test/test.js
index 3a3e249..a1b18aa 100644
--- a/test/test.js
+++ b/test/test.js
@@ -148,13 +148,13 @@ describe('details-menu element', function() {
 
       menu.addEventListener('details-menu-select', event => {
         assert(details.open, 'menu is still open')
-        assert.equal(event.detail.relatedTarget, item)
+        assert.equal(event.relatedTarget, item)
         assert.equal(summary.textContent, 'Click')
       })
 
       menu.addEventListener('details-menu-selected', event => {
         assert(!details.open, 'menu is closed')
-        assert.equal(event.detail.relatedTarget, item)
+        assert.equal(event.relatedTarget, item)
         assert.equal(summary.textContent, 'Hubot')
         done()
       })