How to use the isError function from joi

referent.js

GitHub: betagouv/service-national-universel

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    .valid(FILE_STATUS_PHASE1.TO_UPLOAD, FILE_STATUS_PHASE1.WAITING_VERIFICATION, FILE_STATUS_PHASE1.WAITING_CORRECTION, FILE_STATUS_PHASE1.VALIDATED)
    .required(),
  [`${document}FilesComment`]: Joi.alternatives().conditional(`${document}FilesStatus`, {
    is: FILE_STATUS_PHASE1.WAITING_CORRECTION,
    then: Joi.string().trim().required(),
    otherwise: Joi.isError(new Error()),
  }),
}).validate(req.body);
if (bodyError) return res.status(400).send({ ok: false, code: bodyError });
if (!tempValue[`${document}FilesComment`]) tempValue[`${document}FilesComment`] = undefined;

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app.js

GitHub: kunalelsner/webproject

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// });
// const dschema = custom.object();

//for checking error
// const { error, value } = schema.validate(data);
// !error ? console.log("success!", Joi.isError(error)): console.log(Joi.isError(error))

//check giving argument is expression or not
//Joi.x is genrate a dynamic expression 
const expression = Joi.x('{a}');

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