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Cómo convertir un nulo a falso con Joi

Estaba trabajando con Yup pero ahora tengo que usar Joi para la validación de datos.

Me gustaría hacer el equivalente de este Yup con Joi:

 Yup.boolean().nullable().transform((value) => (value === null ? false : value));

Intenté muchas cosas pero ninguna funcionó:

 Joi.boolean().allow(null).custom((value, helper) => { if (value === null) { return false; } return value; });
 Joi.boolean().allow(null).cast("string").custom((value, helper) => { if (value === "null") { return false; } return value; });
 Joi.boolean().allow(null).cast("string").falsy("null")
about 4 years ago · Juan Pablo Isaza
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