Can you make the imports forward compatible please? The scheme is try "new import" except "old import". Proposals below. You probably have to add some "type: ignore" or similar to satisfy mypy and flake8.

Indeed, the current PR is valid only for "poetry = ^1.3.0" so that it is valid only after poetry 1.3.0 is released. I have made it backwards compatible in the way you describe so that we can release it already. If this PR is released only after the release of poetry 1.3.0, you may consider dropping the last commit (and require poetry = ^1.3.0).

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Yeah, if poetry-plugin-export and poetry would not be so closely coupled we could just wait. Unfortunately, we are still delivering poetry-plugin-export with poetry. (We intend to stop doing this. Another maintainer has already created a proof-of-concept on how to proceed in a gracefully way but he hasn't been available lately.) That's why we want to release a version of poetry-plugin-export that can be delivered with poetry 1.3 and will not trigger a deprecation warning.