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src: support override option in process.loadEnvFile - #63197
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Han5991 wants to merge 2 commits into
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nodejs-github-bot
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May 8, 2026
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@## main #63197 +/- ##
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+ Coverage 90.03% 90.24% +0.20%
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Files 713 714 +1 Lines 224950 225728 +778 Branches 42532 43512 +980 ==========================================
+ Hits 202542 203707 +1165 + Misses 14175 13829 -346 + Partials 8233 8192 -41
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Add an opt-in `override` option to `process.loadEnvFile()` and a matching `--env-file-override-local` CLI flag, allowing values from `.env` files to replace existing variables in `process.env`. By default, existing environment variables continue to take precedence; callers must opt in explicitly. This lets a single process swap env-file contexts at runtime (integration tests, monorepo configurations) without manually parsing files via `util.parseEnv()`. Co-authored-by: Ilyas Shabi <ilyasshabi94@gmail.com> Signed-off-by: sangwook <rewq5991@gmail.com>
Signed-off-by: sangwook <rewq5991@gmail.com>
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I'm -1. This is just additional complexity with an extremely narrow use case.
Han5991
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May 11, 2026
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Thanks for the review — quick clarification: is the concern the CLI I can drop |
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Adds an opt-in
overrideoption toprocess.loadEnvFile()and a matching--env-file-override-localCLI flag, so callers can swap env-file contexts within one process lifetime (integration tests, monorepo configs).Default behavior — existing env vars take precedence — is unchanged (the contract from #49424).
Based on prior work in #52531 (rebased onto current main, with
Maybe<void>return type, lazygetValidatedPath, options-only overload detection, 7 new test cases).Refs: #63027
Refs: #52531