gh-422: Update react + babel and get tests to pass

.babelrc

@@ -1,4 +1,9 @@
 {
-    "presets": [ "react", "es2015" ],
-    "plugins": [ "transform-class-properties", "transform-object-rest-spread" ]
-}
+    "presets": [
+      "@babel/preset-env",
+      "@babel/preset-react"
+    ],
+    "plugins": [
+      "@babel/plugin-proposal-class-properties"
+    ]
+  }

package.json

@@ -49,22 +49,19 @@
     },
     "homepage": "http://leandrowd.github.io/react-responsive-carousel/",
     "devDependencies": {
+        "@babel/cli": "^7.8.4",
+        "@babel/core": "^7.9.0",
+        "@babel/plugin-proposal-class-properties": "^7.8.3",
+        "@babel/preset-env": "^7.9.5",
+        "@babel/preset-react": "^7.9.4",
         "@kadira/react-storybook-addon-info": "^3.4.0",
         "@kadira/storybook": "^2.35.3",
         "auto-changelog": "^1.10.2",
-        "babel-cli": "^6.24.1",
-        "babel-core": "^6.24.1",
-        "babel-jest": "^19.0.0",
-        "babel-loader": "^7.0.0",
-        "babel-plugin-transform-class-properties": "^6.24.1",
-        "babel-plugin-transform-object-rest-spread": "^6.23.0",
-        "babel-preset-es2015": "^6.24.1",
-        "babel-preset-react": "^6.24.1",
-        "babelify": "^7.3.0",
         "browserify": "^14.3.0",
         "connect-modrewrite": "^0.9.0",
         "css-loader": "^0.28.0",
-        "enzyme": "^2.8.2",
+        "enzyme": "^3.11.0",
+        "enzyme-adapter-react-16": "^1.15.2",
         "gh-pages": "^0.11.0",
         "gulp": "^3.8.9",
         "gulp-clean-css": "^2.0.12",
@@ -80,13 +77,13 @@
         "gulp-uglify": "^2.0.0",
         "gulp-util": "^3.0.0",
         "husky": "^3.0.9",
-        "jest-cli": "^19.0.2",
+        "jest-cli": "^25.3.0",
         "prettier": "^1.18.2",
         "pretty-quick": "^2.0.0",
-        "react": "^15.5.4",
-        "react-dom": "^15.5.4",
+        "react": "^16.9.0",
+        "react-dom": "^16.9.0",
         "react-player": "^1.15.3",
-        "react-test-renderer": "^15.5.4",
+        "react-test-renderer": "^16.9.0",
         "sass-loader": "^4.0.2",
         "style-loader": "^0.13.1",
         "vinyl-source-stream": "^1.1.0",
@@ -101,7 +98,10 @@
         "unmockedModulePathPatterns": [
             "node_modules"
         ],
-        "rootDir": "src"
+        "rootDir": "src",
+        "setupFilesAfterEnv": [
+            "../setupTests.js"
+        ]
     },
     "husky": {
         "hooks": {

setupTests.js

@@ -0,0 +1,3 @@
+import Enzyme from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+Enzyme.configure({ adapter: new Adapter() });