potent halo
In the following example, copied from the nestjs doc and slightly modified so that the 'id' param is a string :
@Get(':id')
async findOne(@Param('id', ParseIntPipe) id: string) {
return id;
}
Why does that @tawny vale decorator lets me use a validation that return a number and doesn't complain ?
Is there some config to enable this ?
Thank you !
solemn solstice
Because it is not a validator this is the transformer - ParseIntPipe.
winged tartan
Decorators also can't enforce types. It's a typescript limitation
potent halo
Because it is not a validator this is the transformer - ParseIntPipe.
Correct, I used the word validation when I should have used transformer.
The problem is still the same : ParseIntPipe returns a number not a string though and we end up with the wrong type for id though.
solemn solstice
So do not use a transform pipe at all. At the start it is string.
winged tartan
Again, that's a Typescript limitation. You should be mindful of that and catch it in code review