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If I recall correctly, Kotlin DSL functions such as `implementation` are available only in `.kts` scripts, not `.kt` files. You could write a <https://docs.gradle.org/current/userguide/custom_plugins.html#sec:precompiled_plugins|precompiled script plugin> instead and it should be available there 

Even more than that. These generated accessors are only available in a Kotlin DSL script and only for plugins you applied thorough the `plugins` block in the very same script.

And you cannot achieve what you want with a kts, as then the extension function is scoped to that file. Imagine the contents of the script as the content of a class, that's similar to what actually happens.

Just don't use the accessors in that case, but use the lower level API that is also used by those accessors