(2/19) Emit export dynamic fallback RSC artifacts#93558
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Stack position
Part 2 of 19 in the output export dynamic fallback stack.
Previous PR: #93557 (1/19)
Next PR: #93560 (3/19)
Context
The stack is split so build-time output can land behind
experimental.outputExportDynamicFallbacksbefore the client router behavior is enabled. The target behavior is foroutput: 'export'apps with parameterized App Router routes to emit fallback HTML/RSC artifacts that a later client can resolve for hard loads and soft navigations.This PR scope: Build-time fallback RSC artifacts for route segments.
Once fallback HTML can exist, the client also needs static RSC payloads to resolve parameterized routes. This PR is still build-only: it writes the fallback data that a later client can fetch.
What changed
Deliberately not included
Verification
After restacking and autosquashing, I verified the full stack with:
pnpm --filter=next buildpnpm testonly packages/next/src/lib/output-export-dynamic-fallback.test.ts packages/next/src/lib/output-export-fallback-routes.test.ts packages/next/src/export/helpers/output-export-fallback.test.ts packages/next/src/server/request/fallback-params.test.tspnpm testonly packages/next/src/client/output-export-fallback.test.ts packages/next/src/client/components/router-reducer/fetch-server-response.test.ts packages/next/src/client/components/router-reducer/create-initial-router-state.test.ts packages/next/src/client/components/segment-cache/cache.test.ts packages/next/src/client/components/segment-cache/vary-path.test.tspnpm testonly packages/next/src/client/components/router-reducer/compute-changed-path.test.ts packages/next/src/client/flight-data-helpers.test.ts packages/next/src/server/app-render/postponed-state.test.tspnpm test-start-turbo test/e2e/app-dir-export/test/dynamic-fallback-cache-components.test.ts test/e2e/app-dir-export/test/dynamic-fallback-route-shapes-cache-components.test.ts test/e2e/app-dir-export/test/dynamic-fallback-cache-components-basepath.test.ts test/e2e/app-dir-export/test/dynamic-fallback-optimizations-cache-components.test.ts test/e2e/app-dir-export/test/dynamic-fallback-known-params-cache-components.test.ts test/e2e/app-dir-export/test/dynamic-fallback-conflict.test.tspnpm test-start-turbo test/e2e/app-dir/output-export-dynamic-fallbacks/output-export-dynamic-fallbacks.test.ts test/e2e/app-dir-export/test/output-export-server-io.test.ts test/e2e/app-dir-export/test/output-export-server-io-use-cache.test.ts test/e2e/app-dir-export/test/dynamic-fallback-server-params.test.ts