Add split method to Joi.array()

[leandroluk]

Runtime

node.js

Runtime version

20.17.0

Module version

17.13.3

Used with

@nestjs/config

Any other relevant information

No response

What problem are you trying to solve?

Today I need to pass a list of uri's in a environment variable like this:

NATS_URL = "nats://localhost:4222,nats://localhost:4223,nats://localhost:4224"

Today the only way to slice the variable and validate each element is using a custom validatior inner a Joi.string() method like this:

import {Module} from '@nestjs/common';
import {ConfigModule} from '@nestjs/config';
import Joi from 'joi';

@Module({
  imports: [
    ConfigModule.forRoot({
      validationSchema: Joi.object({
        CACHE_URL: Joi.string()
          .default('nats://localhost:4222')
          .custom((value, helpers) => {
            const uris = value.split(',').map((uri: string) => uri.trim());
            for (const uri of uris) {
              const {error} = Joi.string().uri().validate(uri);
              if (error) return helpers.error('any.invalid');
            }
            return uris;
          })
          .messages({'any.invalid': "Each URI in CACHE_URL must be a valid list of URI's"});
      }),
    }),
  ],
})
export class CacheModule {}

Do you have a new or modified API suggestion to solve the problem?

Maybe create a method .convert() to transform the current validation value and state into another Joi schema validation pipeline, like this:

const schema = Joi.any()
  .custom(value => value.split(','))
  .convert(Joi.array().items(Joi.string().uri()));