Remove render server

[timneutkens]

What?

Remove the obsolete render-server.ts lifecycle adapter and instantiate NextServer directly from router-server.ts.

Why?

The adapter no longer provides a meaningful process boundary. It duplicates server initialization and keeps directory-keyed lifecycle state that can instead be owned directly by each router-server initialization.

How?

Move ServerInitResult into shared server types, capture the prepared NextServer and request handler in router-server.ts, pass explicit dev lifecycle callbacks into bundler setup, route requests through the prepared handler, import sandbox cache-clearing helpers directly from their context module, and remove the obsolete render-worker compatibility environment variable.

Verification

• pnpm prettier --with-node-modules --ignore-path .prettierignore --write <changed files>
• npx eslint --config eslint.config.mjs --fix <changed files>
• pnpm --filter=next types
• pnpm --filter=next build
• NEXT_TEST_PREFER_OFFLINE=1 pnpm test-dev-turbo test/e2e/custom-server/custom-server.test.ts
• NEXT_TEST_PREFER_OFFLINE=1 pnpm test-dev-webpack test/e2e/custom-server/custom-server.test.ts
• NEXT_TEST_PREFER_OFFLINE=1 pnpm test-start-webpack test/e2e/custom-server/custom-server.test.ts
• NEXT_TEST_PREFER_OFFLINE=1 pnpm test-dev-turbo test/development/app-hmr/hmr-env.test.ts
• NEXT_TEST_PREFER_OFFLINE=1 pnpm test-dev-webpack test/development/app-hmr/hmr-env.test.ts

[github-actions]

Failing test suites

Commit: f6e8e65 | About building and testing Next.js

pnpm test-dev test/development/app-dir/hmr-deleted-page/hmr-deleted-page.test.ts (job)

• hmr-deleted-page > should not show errors for a deleted page (DD)

Expand output

● hmr-deleted-page › should not show errors for a deleted page

Expected no visible Redbox but found one
header: ./app/page/page.tsx:1:1
Module not found: Can't resolve './style.css'
> 1 | import './style.css'
    | ^^^^^^^^^^^^^^^^^^^^
  2 |
  3 | import { Test } from './test'
  4 |



https://nextjs.org/docs/messages/module-not-found
Show More
Runtime Error
description: ./app/page/page.tsx:1:1
Module not found: Can't resolve './style.css'
> 1 | import './style.css'
    | ^^^^^^^^^^^^^^^^^^^^
  2 |
  3 | import { Test } from './test'
  4 |



https://nextjs.org/docs/messages/module-not-found
source: null

  25 |     await waitForHydration(browser)
  26 |
> 27 |     await waitForNoRedbox(browser)
     |     ^
  28 |     expect(await browser.elementByCss('h1').text()).toBe('404')
  29 |   })
  30 | })

  at Object.<anonymous> (development/app-dir/hmr-deleted-page/hmr-deleted-page.test.ts:27:5)

[github-actions]

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