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Keep Email API Templates Narrow: Typed View Models and Attachments in Node.js

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The article argues that an email API is best chosen when its template contract accepts a small, versioned view model while the application retains control of authorization, attachments, and retries. It applies this to two cases: password reset emails and emailed gaming reports. The application should generate reset URLs and select safe report data, while the template handles only presentation. The author proposes a typed EmailMessage and EmailTransport interface in Node.js so the rest of the product avoids provider-specific details. Tests with fixture data are recommended to catch unexpected fields and accidental data exposure.

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