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luismeyer
added this pull request to stack #512
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Stacked on #511 (
codex/flags-header-source), including the unified polling initialization and source-assessment fixes.Set
DEBUG=@vercel/flags-coreto follow the controller, shared cache, and network sources through one globalconsole.debuglogger. Every event includes the configuredclientNameso concurrent clients can be distinguished.State transitions show the previous state, next state, and reason. Evaluation and
getDatafile()events show project, revision, age, freshness assessment, and failure allowance. Refresh events distinguish background, blocking, and shared work; response receipt is separate from cache application. Stream-confirmed cancellation is distinguished from shutdown, and ordinary freshness confirmations do not look like outage recovery. Startup events expose timeout and freshness thresholds. HTTP retries and stream reconnects include attempt counts, delays, and reasons.Source assessment failures log
cache.source-errorandheader.fallbackwith reasonsource-assessment-error. Failed cold fetches propagate normally without claiming a source switch. Every polling transition logsstart-pollingand goes through polling initialization, including real stream disconnects.Logging remains off by default, checks the namespace on each call, and computes details lazily. Diagnostics omit credentials, raw headers, definitions, evaluation entities, and raw error messages; a throwing console cannot interrupt client operations. The README includes an example trace and event guide. Event names and fields are internal diagnostics.
Validation: the rebased tree exactly matches the reviewed local implementation. All 1,012 core unit tests pass on Node 22 and Node 24; TypeScript, the core build, changed-file Biome, and diff checks pass. Regression coverage includes shared polling startup, stale-if-error at timeout, recovery from the stream while HTTP is pending, and shutdown cancellation without an unhandled rejection. Live-service integration tests were excluded.