How do I extend the jest config?

[papiro]

I thought I had used rescripts about a year ago to create functions which could extend the various configs. These functions would get passed the existing config object and allow me to modify it or add nodes into the object before returning it. It looks like the library has changed its interface but now I don't see that there are any rescripts to modify the jest config.

The use-babel-jest-config doesn't appear to do that since the example it shows in its repo is actually just showing that it allows you to provide your own .babelrc. I would like to extend the jest.config.js. Is this possible with an existing rescript?

[papiro]

NVM! Just realized that the way to do it is via a custom rescript which returns an object with a jest property.