if oneOf

[automaticdreams]

I trying to implement a check on three fields, and can't work out how to do this

if all three fields are empty, pass
if any one field has a value, validate the other two fields
ie
{startDate: '2022-03-27', endDate: '', description: ''} should have two validation errors, one for description and one for endDate
{startDate: '2022-03-27', endDate: '2022-03-27', description: ''} should have one validation error, for description
{startDate: '2022-03-27', endDate: '', description: 'some text'} should have one validation error, for endDate
{startDate: '', endDate: '2022-03-27', description: ''} should have two validation errors, one for description and one for startDate
{startDate: '', endDate: '', description: 'some text'} should have two validation errors, one for startDate and one for endDate
{startDate: '', endDate: '', description: ''} should NOT have any validation errors

I've tried the following
check('startDate').if(check('endDate').isDate() || check('description').notEmpty()).isDate().withMessage('Enter a valid start date')
check('endDate').if(check('startDate').isDate() || check('description').notEmpty()).isDate().withMessage('Enter a valid end date')
check('description').if(check('startDate').isDate() || check('endDate'). isDate()). notEmpty().withMessage('Enter a description')

but that only validates the first bit of the if (so for example, it doesn't check startDate if only description has a value)
I don't want to check them separately, as the project requires that there is only one error message presented for each field

I then tried using oneOf like so
check('startDate').if(oneOf([
check('endDate').isDate(),
check('description').notEmpty(),
])).isDate().withMessage('Enter a valid start date')

but that is showing a syntax error, which I presume is the combination of using if with oneOf - I can't find any documentation showing how to use oneOf inside an if

[gustavohenke]

Thanks for raising!

Here's a quick repro I put up:
https://www.typescriptlang.org/play?ssl=8&ssc=1&pln=8&pc=55#code/JYWwDg9gTgLgBAbzgYwBYFNkGsA0cIB26A8gGZwC+cpUEIcA5OgB5hToDOHAtAG4CGAG2AATfjGgMA3AFgAUPLSYsACgYcY-WABFx6BgEp5cE3AB0wUisIkrAbWOmnS7GvQERumPoMWOX9BUDHEcnExdVBhFOZChgMBhgQkMzAggYAFFwGABPIJC5JwBdAyNC0z8AoLMAd2AYVABZTg5+AHNAhgyCbyg4fjgBYRE4DS14MW9DKSA