Typescript: Asynchronous custom validation with error message

[lambou]

The current validate type in @types/mongoose/index.d.ts is:

validate?: RegExp | [RegExp, string] |
    SchemaTypeOpts.ValidateFn<T> | [SchemaTypeOpts.ValidateFn<T>, string] |
    SchemaTypeOpts.ValidateOpts | SchemaTypeOpts.AsyncValidateOpts |
    SchemaTypeOpts.AsyncPromiseValidationFn<T> | SchemaTypeOpts.AsyncPromiseValidationOpts |
    (SchemaTypeOpts.ValidateOpts | SchemaTypeOpts.AsyncValidateOpts |
      SchemaTypeOpts.AsyncPromiseValidationFn<T> | SchemaTypeOpts.AsyncPromiseValidationOpts)[];

Here is the definition where you can give the validation message:
[SchemaTypeOpts.ValidateFn, string] it is synchronous only

can you add somthing like [SchemaTypeOpts.AsyncPromiseValidationFn, string]

so it will be possible to write (using async):

const TestSchema = new Schema({  
    user : {
        type: Schema.Types.ObjectId,
        ref: 'User',
        validate: [
            async function(value){
                return UserSchema.findOne({_id: value}) != null;
            },
            `User doesn't exist.`
        ]
    }
}

Thanks in advance

[hasezoey]

mongoose currently dosnt make offical typescript types, you should open a new issue in https://github.com/DefinitelyTyped/DefinitelyTyped/issues

reference: #8108