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docs: Document npm_old_version and npm_new_version environment variables - #9385

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36degrees:document-npm-version-env-vars
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docs: Document npm_old_version and npm_new_version environment variables#9385
owlstronaut merged 2 commits into
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36degrees:document-npm-version-env-vars

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@36degrees

@36degrees36degrees commented May 21, 2026

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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.

@36degrees
Document npm version env vars in scripts docs
fde2463
npm sets two additional environment variables when running the `preversion`, `version`, `postversion` scripts, but these aren’t documented anywhere.
Document the variables in the ‘Scripts’ docs. This feels like the right place for these docs as it’s where the other environment variables are listed.
@36degrees
Add reference to env vars in npm version docs
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@36degrees
36degrees requested review from a team as code ownersMay 21, 2026 06:47
@NickColleyNickColley mentioned this pull request May 21, 2026
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@owlstronautowlstronaut changed the title Document npm_old_version and npm_new_version environment variablesdocs: Document npm_old_version and npm_new_version environment variablesMay 21, 2026
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owlstronaut merged commit d124c08 into npm:latestMay 21, 2026
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github-actionsBot commented May 21, 2026

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🎉 Backport to release/v11 created: #9389

owlstronaut pushed a commit that referenced this pull request May 21, 2026
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docs: Document npm_old_version and npm_new_version environment va…
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…riables (#9389)
Backport of #9385 to `release/v11`.
Co-authored-by: Oliver Byford <oliver.byford@digital.cabinet-office.gov.uk>
@npm-cli-botnpm-cli-bot mentioned this pull request Jun 23, 2026
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