Upgrade dependencies. Replace build with rollup.

babel.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  presets: ['@babel/preset-env', '@babel/preset-react'],
+};

license

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2017 Jacob Buck
+Copyright (c) 2019 Jacob Buck
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -18,4 +18,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+SOFTWARE.

package.json

@@ -7,7 +7,7 @@
     "lib"
   ],
   "scripts": {
-    "build": "babel --out-dir lib src",
+    "build": "rollup -c",
     "test": "echo \"Error: no test specified\" && exit 1",
     "prepublish": "npm run build"
   },
@@ -31,14 +31,19 @@
   },
   "homepage": "https://github.com/jacobbuck/react-beforeunload#readme",
   "dependencies": {
-    "prop-types": "^15.5.10"
+    "prop-types": "^15.7.2"
   },
   "peerDependencies": {
     "react": ">=15.3.0"
   },
   "devDependencies": {
-    "babel-cli": "^6.24.1",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-preset-es2015": "^6.24.1"
+    "@babel/core": "^7.4.5",
+    "@babel/preset-env": "^7.4.5",
+    "@babel/preset-react": "^7.0.0",
+    "husky": "^2.3.0",
+    "lint-staged": "^8.1.7",
+    "prettier": "^1.17.1",
+    "rollup": "^1.13.1",
+    "rollup-plugin-babel": "^4.3.2"
   }
 }

prettier.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  singleQuote: true,
+  trailingComma: 'es5',
+};

rollup.config.js

@@ -0,0 +1,11 @@
+import babel from 'rollup-plugin-babel';
+
+export default {
+  input: 'src/Beforeunload.js',
+  output: {
+    file: 'lib/Beforeunload.js',
+    format: 'cjs',
+  },
+  external: ['prop-types', 'react'],
+  plugins: [babel()],
+};

src/Beforeunload.js

@@ -1,5 +1,5 @@
-import PropTypes from "prop-types";
-import React from "react";
+import PropTypes from 'prop-types';
+import React from 'react';
 
 class Beforeunload extends React.Component {
   static propTypes = {
@@ -8,11 +8,11 @@ class Beforeunload extends React.Component {
   };
 
   componentDidMount() {
-    window.addEventListener("beforeunload", this.handleBeforeunload);
+    window.addEventListener('beforeunload', this.handleBeforeunload);
   }
 
   componentWillUnmount() {
-    window.removeEventListener("beforeunload", this.handleBeforeunload);
+    window.removeEventListener('beforeunload', this.handleBeforeunload);
   }
 
   handleBeforeunload = event => {
@@ -23,7 +23,7 @@ class Beforeunload extends React.Component {
       returnValue = onBeforeunload(event);
     }
 
-    if (typeof returnValue === "string") {
+    if (typeof returnValue === 'string') {
       event.returnValue = returnValue;
       return returnValue;
     }