[CUTL-90] ⬆️ (Deps) Upgrade Babel and related libraries - add configurations for updated proposals, including optional chaining

Author: emilyemorehouse

.storybook/.babelrc

@@ -0,0 +1,28 @@
+{
+  "presets": [
+    ["@babel/preset-env", { "modules": false, "shippedProposals": true, "loose": true }],
+    "@babel/preset-react",
+    "@babel/preset-flow"
+  ],
+  "plugins": [
+    "styled-components",
+    ["@babel/plugin-proposal-decorators", { "legacy": true }],
+    ["@babel/plugin-proposal-class-properties", { "loose": true }],
+    ["@babel/plugin-proposal-private-methods", { "loose": true }],
+    "@babel/plugin-syntax-dynamic-import"
+  ],
+  "env": {
+    "production": {
+      "only": ["app"],
+      "plugins": [
+        "lodash",
+        "transform-react-remove-prop-types",
+        "@babel/plugin-transform-react-inline-elements",
+        "@babel/plugin-transform-react-constant-elements"
+      ]
+    },
+    "test": {
+      "plugins": ["@babel/plugin-transform-modules-commonjs", "dynamic-import-node"]
+    }
+  }
+}

babel.config.js

@@ -1,11 +1,6 @@
 module.exports = {
   presets: [
-    [
-      '@babel/preset-env',
-      {
-        modules: false,
-      },
-    ],
+    ['@babel/preset-env', { modules: false, shippedProposals: true, loose: true }],
     '@babel/preset-react',
     '@babel/preset-flow',
   ],