Use a custom undici instance

[dnlup]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

👋🏻 Thank you for this awesome package! I was thinking that it could be useful to allow to pass a custom undici instance in addition to or as an alternative to the custom options already available. WDYT?

Motivation

The first 2 reasons that come to mind are:

• use a mockedClient in tests
• re-use an instance already initialised in the app

Example

No response

[mcollina]

Sure, good idea! Would you like to send a PR?

[dnlup]

Yes, I'll work on it 😉

[simonecorsi]

Following, let me know if you need some help!

[dnlup]

I was thinking about using an option called instance in the undici object. Otherwise the undici key could point to the instance, but it would complicate the checks done in buildRequest.