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[v6.x backport] src: add environment cleanup hooks

Rodrigo Muino Tomonari requested to merge github/fork/gabrielschulhof/backport-19377-to-v6.x into v6.x-staging

This adds pairs of methods to the Environment class and to public APIs which can add and remove cleanup handlers.

Unlike AtExit, this API targets addon developers rather than embedders, giving them (and Node’s internals) the ability to register per-Environment cleanup work.

We may want to replace AtExit with this API at some point.

Many thanks for Stephen Belanger for reviewing the original version of this commit in the Ayo.js project.

Refs: https://github.com/ayojs/ayo/pull/82 PR-URL: https://github.com/nodejs/node/pull/19377

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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