oxc-project/oxc oxlint_v0.4.0 on GitHub

Potential Breaking Changes

enforce rule severity from the cli and configuration file by @Boshen in #3337

The --deny or -D flag in the CLI, and the "error" severity setting in the configuration file will now set linter diagnostics to be an "error" and exit the program with exit code 1.

Previously, these flags had no effect, and all linter diagnostics were reported as warnings.

This means in CI, oxlint --deny-warnings is no longer needed for exit code 1 if oxlint -D correctness is set.

To restore the previous "report as warning" behaviour, the --warn or -W flag is added to the CLI, and the "warn" severity in the configuration file will take into effect.

merge deepscan rules into oxc rules by @Boshen in #3327

deepscan rules are now "oxc" rules, because there is no "deepscan" plugin in the eslint ecosystem and this caused some confusion.

Ecosystem CI

We added the Oxlint Ecosystem CI to maximize ecosystem compatibility, reduce churn, and minimize break-after-release

New Features

--disable-oxc-plugin by @Boshen in #3328
--disable-react/unicorn/typescript-plugin by @Boshen in #3305

The default rule set enables some plugins by default, the following CLI arguments are added for disabling them:

--disable-react-plugin
--disable-unicorn-plugin
--disable-oxc-plugin
--disable-typescript-plugin

New Rules

Two notable new rules that are under experiment but worth a try:

No Barrel File

oxlint --import-plugin -D no-barrel-file

Loading a lot of modules is slow for runtimes and bundlers.

To change the threshhold:

oxlint -c oxlintrc.json --import-plugin -D no-barrel-file

{
  "rules": {
    "oxc/no-barrel-file": ["error", {
      "threshold": 10
    }]
  }
}

See Speeding up the JavaScript ecosystem - The barrel file debacle for background reading.

Rule of Hooks

oxlint -D rules-of-hooks

Enforce the React Rules of Hooks.

eslint-plugin-jest/no-duplicate-hooks by @eryue0220 in #3358
default-case rule by @jelly in #3379
no-new by @jelly in #3368
prefer-exponentiation-operator by @jelly in #3365
symbol-description by @jelly in #3364
jsdoc/require-returns-description by @leaysgur in #3397

Bug Fixes

fix(linter): avoid infinite loop in jest/expect-expect by @mysteryven in #3332
fix(linter): avoid infinite loop when traverse ancestors in jest/no_conditional_expect by @mysteryven in #3330
fix(linter): fix panic in jest/expect-expect by @Boshen in #3324
fix(linter/jsx-no-undef): check for globals when an identifier is undefined by @Boshen in #3331
fix(linter/next): false positives for non-custom font link by @Dunqing in #3383

Performance Improvements

perf(lexer): use bitshifting when parsing known integers by @DonIsaac in #3296
perf(linter): use usize for RuleEnum hash by @Boshen in #3336
perf(parser): more efficient number parsing by @overlookmotel in #3342
perf(parser): use FxHashSet for not_parenthesized_arrow by @Boshen in #3344
perf(parser): improve parse_simple_arrow_function_expression by @Boshen in #3349
perf(parser): improve expression parsing by @Boshen in #3352
perf(parser): improve is_parenthesized_arrow_function_expression by @Boshen in #3343

What's coming next

Published JSON schema for configuration file
More features to the configuration file
Automatically synced and never outdated documentation website pages

Full Changelog: oxlint_v0.3.5...oxlint_v0.4.0

oxc-project/oxc oxlint_v0.4.0 oxlint v0.4.0 on GitHub