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This PR removes support for
import
of extensionless files, per discussion in nodejs#31388 (comment). Such support was only added last month, in nodejs#31021, and 13.6.0. This PR reverts that one, and updates the docs to make it clear that the prior support for extensionless files was limited to main entry points.Whether we want to go further and drop support for extensionless ESM main entry points is an open question, and one that I think should probably get its own PR. I assume that that support was there as part of supporting bin files, so if we remove it we’ll need some other equivalent solution.
I also appreciate that nodejs#31021 had its own purpose in enabling WASI entry points, and so reverting it will mean that we need a new solution for that use case as well. I don’t think this PR needs to wait on that solution, however, since WASI entry points aren’t supported yet in Node.