Describes component boundaries, state and data flow, interfaces, and integration rules for error handling. This reference fixes the adoption boundary, failure behavior, and observable evidence while leaving environment-specific limits configurable.
Package status: reference context ready for human review. The contract and test scenarios are complete, but no claim is made that an adopting implementation has passed them.
Decision
For Error handling, adopt a typed user-state model with server data kept distinct from transient view state. Implement the behavior through one authoritative write path, typed interfaces, explicit state, and idempotent side-effect handling. This implementation block focuses specifically on implementation architecture. This package is a reference contract: the adopting team must choose numeric limits, providers, jurisdictions, and operational owners from evidence in its own environment.
Scope
- The Error handling actors, inputs, outputs, states, policy or schema versions, and externally visible outcomes required for the implementation architecture focus of this implementation block.
- Primary and alternate interfaces, background work, caches, integrations, support paths, and evidence that can exercise the same boundary.
- Adoption-specific configuration, rollout, recovery, and verification responsibilities needed to apply the reference safely.
Outside this block
- Choosing a universal vendor, framework, jurisdiction, numeric threshold, retention period, or service-level objective for every adopter.
- Claiming that packaged scenarios have run against a downstream implementation or that this reference grants legal, security, or accessibility certification.
Contract
- Represent loading, empty, ready, stale, offline, validation, authorization, and dependency errors explicitly where they can occur.
- Keep the URL, server record, and component state synchronized through named ownership rules instead of mirrored mutable copies.
- Preserve keyboard operation, focus, labels, announcements, zoom, and reduced-motion behavior across responsive layouts.
- Cancel or ignore obsolete asynchronous work so an older response cannot overwrite a newer user intent.
- Validate inputs once at the boundary and preserve the normalized representation used by downstream logic.
- Persist the business transition before or atomically with an outbox record; consumers deduplicate by durable operation identity.
- Classify validation, authorization, conflict, offline, timeout, dependency, and unexpected failures and present a recovery action appropriate to each class.
- Preserve valid input and navigation context, prevent duplicate retries, associate errors with affected controls, and retain a safe correlation identifier for support.
- For the implementation architecture variant, enforce this declared boundary: describes component boundaries, state and data flow, interfaces, and integration rules for error handling.
Implementation guidance
- Ship additive storage and interface changes first, backfill observably, then retire old paths after compatibility evidence.
- Model Error handling inputs, outputs, actors, states, invariants, side effects, and evidence before selecting framework or vendor details.
- Store the applicable Error handling contract or policy version with material state so migrations, replay, and support decisions remain attributable.
- Introduce the path behind controlled rollout, compare expected and observed outcomes, and keep a tested recovery route until adoption evidence is complete.
Failure handling and safeguards
- A failed request preserves recoverable input, identifies the affected operation, and offers only retries that are safe for that operation.
- Invalid or contradictory Error handling state is rejected or quarantined; the implementation never guesses a value that broadens authority or duplicates an effect.
- Retries are bounded and use durable identity; after exhaustion, work reaches an inspectable terminal state with an accountable owner.
Verification and operations
- Inject dependency failure before and after persistence and prove that retry converges on one externally visible outcome.
- Monitor Error handling success, denial, validation failure, dependency failure, retry exhaustion, and recovery by contract version without sensitive payload dimensions.
- Re-run paired positive and negative fixtures after policy, schema, dependency, migration, or boundary changes and preserve the resulting evidence.
Adoption assumptions
- Names and values in the example are a concrete fixture, not universal defaults; adopters replace them through documented evidence and ownership.
- The adopting system can provide authenticated identity, durable operation or record versions, bounded telemetry, and a controlled path for change.
The executable-looking examples in this package are fixtures and acceptance contracts. Run the collection validator to check structure and metadata, then translate and execute the scenarios in the target repository before recording implementation evidence.