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I have a mixed groovy/kts project and I have a question around interaction between kts and non kts build files:

I created a buildSrc project with the `buildSrc/build.gradle.kts` . I'd like to access the values (ext or otherwise) and functions from the root/top-level project's groovy-based `build.gradle` . What's the best way to do so?

That's not about Groovy vs. Kotlin. What you want to do simply is not possible.
Using `ext` properties per-se is usually already bad practice, as it usually is just a work-around for doing something not properly. 
But besides that, `buildSrc` is a separate build that is run before your build even starts, so you can hardly access the main project's build model from the `buildSrc` build script. 

If you want to share some build logic, put it to a separate build, that you then `includeBuild` and use where you need it.

thank you - so buildSrc is the first thing that runs whenever you run any gradle build in the project before the rest of gradle?

Well, no, the settings script runs before

That's why you can't use `buildSrc` classes in settings scripts anymore since a few years

thank you for that insight, is this has been really useful