- aggregate-error - create an error from multiple errors
- clean-stack - clean up error stack traces
- ensure-error - ensures a value is a valid error by making it one if not
- error-ex - easy error subclassing and stack customization
- extract-stack - extract the actual stack of an error
- hard-rejection - make unhandled promise rejections fail hard right away
- is-error-constructor - check if a value is an error constructor
- is-retry-allowed - check if retry is allowed for an error
- serialize-error - serialize/deserialize an error into a plain object