I Know I Am Late But Facing Some Issue With Type, Then Try Another Way To Implement This:

export class AuthParam {
    @IsNumber()
    id: number;
  
    @IsString()
    type: string;
  
    @IsString()
    value: string;
  }

Validation function

@ValidatorConstraint()
export class IsAuthArray implements ValidatorConstraintInterface {
    public async validate(authData: AuthParam[], args: ValidationArguments) {
        return Array.isArray(authData) && authData.reduce((a, b) => a && (typeof b.id === "number") && typeof b.type === "string" && typeof b.field === "string", true);
    }
}

export class SignInModel {
    @IsNotEmpty()
    @IsArray()
    @ArrayMinSize(2)
    @ArrayMaxSize(2)
    @Validate(IsAuthArray, {
        message: "Enter valid value .",
    })
    authParameters: AuthParam[];
  }

Maybe It Will Help Someone 😃

You have to create a custom validator for that. The docs are pretty good: https://github.com/typestack/class-validator#custom-validation-classes

When you create your custom validator class, in your implementation of validate you can access the other parameter beeing validated in the args argument. Just write your if statements and return false if they are not met. You can even return your custom error messages and implement your own decorator.