fastify-best-practices

Fastify plugin architecture isolates every plugin in its own context to enable safe composition. You organize plugins by feature and register them to achieve a scalable, maintainable project structure with isolated testing.

Fastify decorators and lifecycle hooks extend functionality within encapsulated plugins. Following best practices for registration patterns and loading orders ensures decorators and hooks perform optimally without breaking encapsulation.

@fastify/autoload manages plugin loading orders automatically by scanning directories. It simplifies Fastify project structure by automatically registering encapsulated plugins, ensuring decorators and hooks load correctly for safe composition.

Yes, you can test Fastify plugins in isolation because every plugin runs in its own encapsulated context. Organizing plugins by feature allows you to test user and admin features independently, ensuring maintainable architecture.

TypeScript augmentation is required to ensure performance and testability when using Fastify decorators. Augmenting decorators within your plugin architecture provides type safety across encapsulated contexts and ensures scalable composition.

fastify-plugin breaks encapsulation when needed, allowing decorators and hooks to be shared across the parent Fastify application context. It provides controlled composition, ensuring maintainability while allowing necessary cross-plugin functionality.