fix(linter): merge env from extended config files

[Sysix]

closes #20087
POC: need to check if everything is fine, specially with globals

[Sysix]

• fix(linter): merge env from extended config files #20088 👈 (View in Graphite)
• main

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[Copilot]

Pull request overview

This PR fixes Oxlint config resolution so that env values are inherited from extended (extends) configuration files, addressing missing globals when env was defined only in a base config.

Changes:

• Update Oxlintrc::merge to merge env from extended configs, with the current config taking precedence.
• Add an OxlintEnv::merge helper to support merging env maps.
• Add a CLI fixture + snapshot test to validate env inheritance and override behavior.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
crates/oxc_linter/src/config/oxlintrc.rs	Merge env from extended configs instead of ignoring it.
crates/oxc_linter/src/config/env.rs	Add OxlintEnv::merge to combine environment maps.
apps/oxlint/src/lint.rs	Add a regression test that runs the new extends_env fixture.
apps/oxlint/src/snapshots/[email protected]	Snapshot asserting only the override case reports console as undefined.
apps/oxlint/fixtures/cli/extends_env/**	New fixture configs/files covering inheritance + override of env.

[codspeed-hq]

Merging this PR will not alter performance

✅ 4 untouched benchmarks
⏩ 52 skipped benchmarks¹

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_{Comparing 03-06-fix_linter_merge_env_from_extended_config_files (702d3f8) with main (e8547cc)²}

Footnotes

1. 52 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (2c0010a) during the generation of this report, so e8547cc was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.