Function Nullable

Only validates the given value if it is not null.

This is similar to the built-in @IsOptional except that it does not allow undefined. Note that this validator does not work as expected with { each: true } (because it is based on @ValidateIf which does not either).

Example

// Ensure the value is a string or null (but not undefined).
@Nullable()
@IsString()
value: string | null
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