How to extend an action/check?

[IlyaSemenov]

As a library developer, I want to extend some existing action/check with new behavior. Let's say I want to extend url so that it validates that URL is safe to use in browser links (prevent javascript:alert("pwn3d") alike input).

Is there a way to do so with minimal boilerplate? What I mean is, I can't use something like:

const safeUrl = (message?: string) => v.pipe(v.url(message), v.check(isSafeUrl, message))

because pipe() expects a schema as the first argument. Is there a similar counterpart for actions?

[fabian-hiller]

This probably works as expected when adding v.string() to the beginning of the pipeline. Without the schema, the actions wouldn't know what type to expect because they infer it from the schema. But I understand that this is not optimal in all cases and a more minimal API without a schema would be appreciated. Feel free to create an issue so others can join and discuss.

[IlyaSemenov]

Thanks, here's the issue: #835.