cleanStripeBillingDetails.js

const data = {
  name: "Ted Bundy",
  email: "yummy@thatsnotcool.com",
  address: { 
    line1: "9412 39th Street East",
    line2: "Suite 456",
    country: "",
    city: "",
  }
};

// Pass through the optional or required fields for your stripe payment methods `billing_details` and output object
// with fields that only had a value to prevent gettings errors from stripe.
function cleanStripeBillingDetails({ name, email, address }) {
  return {
    ...(name && { name }),
    ...(address && { address: {
      ...(address.line1 && { line1: address.line1 }),
      ...(address.line2 && { line2: address.line2 }),
      ...(address.city && { city: address.city }),
      ...(address.country && { country: address.country })
      }
    }),
    email
  }
}

const beautiful = cleanStripeBillingDetails(data);
// expect(beautiful).to.equal({
//   name: "Ted Bundy", 
//   address:{
//     line1: "9412 39th Street East",
//     line2: "Suite 456"
//   }, 
//   email: "yummy@thatsnotcool.com"
// })