This example features:

• An app using proposed do expressions.
• It uses babel-preset-stage-0, which allows us to use above JavaScript feature.
• It uses '.babelrc' file in the app directory to add above preset.

Most of the time, when writing a custom .babelrc file, you need to add next/babel as a preset.

Preview the example live on StackBlitz:

Deploy the example using Vercel:

Execute create-next-app with npm or Yarn to bootstrap the example:

npx create-next-app --example with-custom-babel-config with-custom-babel-config-app
# or
yarn create next-app --example with-custom-babel-config with-custom-babel-config-app

Deploy it to the cloud with Vercel (Documentation).