Wire ServerInsertedHTMLContext into the SSR pipeline so libraries like
Apollo Client, styled-components, and emotion that use
useContext(ServerInsertedHTMLContext) get a working callback registration
function during SSR.
Changes:
- Add ServerInsertedHTMLContext export to navigation.ts (single shared
context, RSC-safe with null fallback)
- Wrap SSR rendered tree with ServerInsertedHTMLContext.Provider in
handleSsr() — the provider value is useServerInsertedHTML itself, so
both direct callers and useContext() callers push to the same
ALS-backed callback array
- Add TypeScript declaration in next-shims.d.ts
- Add 8 integration tests verifying the actual Apollo Client pattern
(useContext returns a usable callback, callbacks are flushed correctly)
Addresses review feedback from #151:
- Single context (no dead getServerInsertedHTMLContext)
- Provider wired into SSR pipeline (not disconnected)
- Tests verify real integration behavior, not React internals
MD YUNUS