Merge pull request #1731 from mobxjs/babel7

Use Babel7

package.json

@@ -41,14 +41,14 @@
   ],
   "homepage": "https://mobx.js.org/",
   "devDependencies": {
+    "@babel/core": "^7.1.0",
+    "@babel/plugin-proposal-class-properties": "^7.1.0",
+    "@babel/plugin-proposal-decorators": "^7.1.0",
+    "@babel/preset-env": "^7.1.0",
     "@types/jest": "^21.1.9",
     "@types/node": "^7.0.22",
-    "babel-core": "7.0.0-beta.3",
+    "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "^23.6.0",
-    "babel-plugin-transform-regenerator": "^6.26.0",
-    "babel-preset-es2015": "7.0.0-beta.3",
-    "babel-preset-react": "7.0.0-beta.3",
-    "babel-preset-stage-1": "7.0.0-beta.3",
     "browserify": "^12.0.1",
     "chalk": "^1.1.3",
     "coveralls": "^2.11.4",
@@ -117,4 +117,4 @@
       "<rootDir>/node_modules/"
     ]
   }
-}
+}

test/.babelrc

@@ -1,12 +1,7 @@
 {
-  "presets": [
-    "react",
-    "es2015",
-    "stage-1"
-  ],
-  "plugins":[
-      "transform-decorators",
-      ["transform-class-properties", { "loose": true}],
-      ["transform-regenerator", { "asyncGenerators": false }]
-  ]
-}
+    "presets": ["@babel/preset-env"],
+    "plugins": [
+        ["@babel/plugin-proposal-decorators", { "legacy": true}],
+        ["@babel/plugin-proposal-class-properties", { "loose": true}]
+    ]
+}