👽 Ensure jest can handle ES modules

Thread for reference: jestjs/jest#6229

* Updated jest config to compile packages published as ESM
* Moved babel config from .babelrc to babel.config.js, .babelrc
  is not properly picked anymore in Babel v7 (see linked ref
  above)

Dockerfile

@@ -53,7 +53,7 @@ WORKDIR /app
 
 # copy configuration/build files
 COPY ./build /app/build/
-COPY ./*.json ./*.js ./.babelrc /app/
+COPY ./*.json ./*.js /app/
 
 # install WITH dev tooling
 RUN npm ci --legacy-peer-deps

babel.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  presets: ['@babel/preset-env', '@babel/react'],
+  plugins: [
+    [
+      'formatjs',
+      {
+        idInterpolationPattern: '[sha512:contenthash:base64:6]',
+        ast: true,
+      },
+    ],
+  ],
+};

package.json

@@ -66,6 +66,10 @@
     ],
     "modulePaths": [
       "<rootDir>/src/openforms/js"
+    ],
+    "transformIgnorePatterns": [
+      "/node_modules/(?!@open-formulieren/formio-builder)/",
+      "\\.pnp\\.[^\\\/]+$"
     ]
   },
   "browserslist": [