Function Optional

Only validates the given value if it is not undefined.

This is similar to the built-in @IsOptional except that it does not allow null. 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 undefined (but not null).
@Optional()
@IsString()
value?: string
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