refactor: adapter entry

[lazarv]

Extracts the duplicated request handling logic from all adapter-generated entry files into a single shared module (adapters/shared/edge-handler.mjs), eliminating ~450 lines of copy-pasted code across 10 deployment adapters.

Motivation

Every adapter (AWS, Azure, Azure SWA, Bun, Cloudflare, Deno, Docker, Firebase, Netlify Edge, Netlify Node) and the default edge entry had their own independent copy of the same core logic:

• Lazy initialization of the reactServer() instance
• HTTP context creation via createContext()
• 404 response handling when response is null
• set-cookie header propagation from httpContext._setCookies
• Error catching with 500 response fallback

This duplication meant that any behavioral change or bug fix had to be replicated across 10+ files, making maintenance error-prone.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	react-server-docs	5b33503	Mar 03 2026, 10:26 PM

[codecov-commenter]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
340	1	339	6

View the top 3 failed test(s) by shortest run time

__test__/http-context.spec.mjs > http cookies

Stack Traces | 9.13s run time

AssertionError: expected { connection: 'keep-alive', …(7) } to match object { Object (set-cookie) }
(7 matching properties omitted from actual)

- Expected
+ Received

  {
-   "set-cookie": "cookie-name=cookie-value",
+   "set-cookie": "cookie-name=cookie-value-update
+ cookie-name=cookie-value-update",
  }

 ❯ __test__/http-context.spec.mjs:88:39

__test__/apps/docs.spec.mjs > docs load

Stack Traces | 128s run time

TimeoutError: page.goto: Timeout 30000ms exceeded.
Call log:
  - navigating to "http://localhost:11925/", waiting until "load"

 ❯ __test__/apps/docs.spec.mjs:10:14

__test__/deno.spec.mjs > preset: get-started-ts

Stack Traces | 300s run time

Error: Hook timed out in 300000ms.
If this is a long-running hook, pass a timeout value as the last argument or configure it globally with "hookTimeout".
 ❯ __test__/deno.spec.mjs:46:18

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