Propagate adapter preferred regions#94123
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lubieowoce
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What?
Propagate edge runtime preferredRegion metadata into adapter outputs and add adapter-config coverage for an edge app route.
Why?
Adapters need access to preferred region metadata from edge outputs when generating provider-specific deployment output.
How?
Copy edge function regions into output.config.preferredRegion and assert the adapter build-complete output for a fixture route with preferredRegion set to cdg1.
Verification
pnpm --filter=next buildNEXT_TEST_PREFER_OFFLINE=1 pnpm test-start-webpack test/production/adapter-config/adapter-config.test.ts