docs: Document npm_old_version and npm_new_version environment variables#9389
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…riables (#9385) npm sets two additional environment variables `npm_old_version` and `npm_new_version` when running the `preversion`, `version`, `postversion` scripts, but these aren’t documented anywhere. Document the variables in the ‘Scripts’ docs, and cross-reference them from the documentation for the version command (and the libnpmversion readme). I've tried to match the existing formatting conventions for each document. Please let me know if anything needs to change. (cherry picked from commit d124c08)
owlstronaut
approved these changes
May 21, 2026
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Backport of #9385 to
release/v11.