types: replace declaration merging with mixin types #427
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For Fastify v5, background: fastify/fastify#5061
Opened this as it is now to get early feedback & insight. Used a class rather than an interface or type since the type needs to exist at runtime if we go with the currently proposed changes to the
fastify-plugin
api (see fastify/fastify#5061 (comment))TODO:
cc @mcollina
Checklist
npm run test
andnpm run benchmark
and the Code of conduct