astro/.changeset/strong-years-travel.md

astro
minor

Introduced a new build option for SSR, called build.excludeMiddleware.

// astro.config.mjs
import {defineConfig} from "astro/config";

export default defineConfig({
    build: {
        excludeMiddleware: true
    }
})

When enabled, the code that belongs to be middleware won't be imported by the final pages/entry points. The user is responsible for importing it and calling it manually.