recover

DDataParser.recover(inner, fallback) wraps a parser and returns its output when it succeeds or a fallback value when it fails. Handy to ensure a safe value while still collecting errors (useful for partial DTOs, logs, migrations, etc.).

Interactive example

Parameters

• inner: parser to protect.
• recoveredValue: value returned when inner fails (and final output type).
• checkers: applied to the final result (whether it comes from inner or the fallback).
• errorMessage: generic message in case of failure before recovery.

Return value

A DataParserRecover. schema.parse(data) always returns DEither.success with either the result of inner or the fallback. Errors produced while running inner are still available in DataParserError for audit/logging.

Other examples

Extended mode

See also

• date - Parser for dates
• nil - Parser for null or undefined values