Customizing serverless functions without middleware

The text explores the intricacies of customizing serverless functions in backend development, advocating for minimizing the use of middleware due to its potential complexity and opaqueness. It highlights the challenges posed by middleware, such as difficulty in tracing request modifications and understanding execution order, which can lead to increased cognitive load and type safety issues. The author suggests adopting principles of function customization that are obvious, explicit, and type-safe, utilizing patterns like decorators in Python or custom functions in TypeScript to achieve these goals. Examples are provided using the Convex platform, demonstrating how to modify function contexts and arguments for tasks like user authentication and API key validation without relying on traditional middleware. The text emphasizes the importance of clear, discoverable, and predictable customization processes, recommending encapsulation of behavior in a single function to enhance readability and maintainability, while also offering strategies to ensure adherence to these practices through tools like ESLint and type-checking in TypeScript.

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