question: array of numbers with null values

[BUONJG]

How to validate an array of numbers where null is allowed?

I have the following command:

export class MyCommand {
    @IsNotEmpty()
    @IsArray()
    @IsNumber(undefined, { each: true })
    @ArrayMaxSize(2)
    public thicknessRange: number[] = [];
}

I want to allow in thicknessRange property any of those values:

• [1, 2] => OK
• [1] => OK
• [null, 2] => Not OK as null is not a number!

The problem:
I don't see any way to allow null in my array of numbers.
Usually, in order to allow null on a number, I add @IsOptional() decorator but in this case it make the entire array optional and it is not what I want.
I tried with @IsOptional({ each: true }) but it didn't work...

[ytetsuro]

I think resolving this issue with your current approach might be difficult.
This is because you are using IsNumber rules, which validate that each item in the array is a number.
I believe creating custom rules would be necessary to address your concerns.