Convert babel config to a different babel config

This is needed because of https://github.com/facebook/jest/issues/6229

babel.config.js

@@ -0,0 +1,26 @@
+module.exports = {
+    "sourceMaps": "inline",
+    "presets": [
+        ["@babel/preset-env", {
+            "targets": {
+                "browsers": [
+                    "last 2 versions"
+                ]
+            },
+            "modules": "commonjs"
+        }],
+        "@babel/preset-typescript",
+        "@babel/preset-flow",
+        "@babel/preset-react"
+    ],
+    "plugins": [
+        ["@babel/plugin-proposal-decorators", { "legacy": true }],
+        "@babel/plugin-proposal-export-default-from",
+        "@babel/plugin-proposal-numeric-separator",
+        "@babel/plugin-proposal-class-properties",
+        "@babel/plugin-proposal-object-rest-spread",
+        "@babel/plugin-transform-flow-comments",
+        "@babel/plugin-syntax-dynamic-import",
+        "@babel/plugin-transform-runtime"
+    ]
+};