Generate TypeScript object Arbitraries

First, thanks for this magnificent library. I switched from jsVerify since couple of months ago and have already used fast-check for a couple of projects.

In my new company, we use TypeScript and I was wondering if there’s any way we can get Arbitraries from TypeScript classes without manually writing them. Say I have a class like this:

class Blog {
   id: string,
   visited: Date
}

class Author {
   id: string,
   name: string,
   blogs: [Blog]
}

How can I generate samples for Author and Blog object without writing specific arbitraries for them, instead of, e.g. something like this

[giogonzo]

Late to the party, but since io-ts has already been mentioned in this thread, here’s a quick attempt at an io-ts Codec to fast-check Arbitrary generator: https://github.com/giogonzo/fast-check-io-ts

[dubzzz]

Hi,

For the moment no 😢

I actually have the very same need but have not found any ways to do that in TypeScript for the moment. I would have wanted to provide something like: fc.forType<MyInterface>() able to generate the Arbitrary magically.

I looked into other projects that might have the same needs like https://github.com/gcanti/io-ts but they do not seem to provide such constructs. I also read stuff concerning transformers in TypeScript but it seems to be very difficult to use and add in the toolchain (even for the end-user).

So for the moment I still do not have anything for that.

Hoping to find a way to that soon ^^ Even some cli generating the Arbitrary code will do for my needs.