empty

DDataParser.empty() only validates undefined. It is the building block to express intentionally absent fields or to combine with optional/nullable.

Interactive example

Parameters

• errorMessage: custom message when the input is not undefined.
• checkers: checkerRefine to add constraints.
• coerce: true to convert certain falsy values to undefined. Defaults to false.

Return value

A DataParserEmpty. parse returns DEither.success<undefined> or DEither.error<DataParserError>.

See also

• date - Parser for dates
• coerce.* - Coercion functions for various types