defineErrors

Related Skills: See error-handling for trySync/tryAsync usage and toast-on-error patterns. See services-layer for service architecture and namespace exports.

When to Apply This Skill

Use this pattern when you need to:

• Define or refactor domain error variants using defineErrors.
• Add error variants that include structured fields and cause: unknown.
• Centralize extractErrorMessage(cause) inside variant factories.
• Infer union and single-variant types via InferErrors/InferError.
• Replace old createTaggedError and split Err-pair patterns.

Import