Transactional emails rarely break in one loud place. They drift a little in the React form, a little in the API shape, and a little again in the background worker. Then somebody renames a field, the email still sends, and the customer gets a blank first name or the wrong CTA.
Source: [Dev.to](https://dev.to/ryanlee91/type-safe-email-events-for-react-teams-196l)