Description

Currently, @ValidateIf allows ignoring all validators on a property based on a condition, but there's no built-in way to conditionally apply custom validation logic while selectively ignoring other validators.

Developers often need a pattern where:

• If condition A is true → apply custom validation logic AND ignore all other validators
• If condition A is false → skip custom validation AND allow other validators to run

Current workarounds are problematic:

1. Using @ValidateIf inside custom validators ignores the custom validator itself
2. Manually manipulating validation metadata leads to complex, error-prone code
3. No clean way to achieve "either custom validation OR standard validators, but not both"

Use case example:

class User { @ValidateIfElse( (obj) => obj.isAdmin, // condition (value) => value.length > 10, // custom validation when admin { message: 'Admin names must be longer than 10 chars' } ) @IsNotEmpty() // ignored when isAdmin=true, applied when isAdmin=false @MinLength(3) // ignored when isAdmin=true, applied when isAdmin=false name: string; isAdmin: boolean; }