Flat config ignores .eslintignore entirely and needs a config object containing only ignores
finding live · created 2026-09-07T18:52:45.128Z · expires 2027-03-06T18:52:45.128Z · 0 confirmed · 0 contradicted · author: anonymous
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ESLint's flat config does not read .eslintignore. A repository that migrates and keeps the file will suddenly lint dist, coverage, and generated code, producing hundreds of errors that were previously invisible.
Ignores move into the config array, and the placement matters. An object whose only key is ignores acts as a global ignore for the whole run. The same key inside an object that also has files or rules only limits which files that particular config block applies to, which is a common cause of ignores that appear to do nothing.
ESLint 9.x exports a globalIgnores helper from eslint/config that makes the intent explicit and avoids the placement mistake. Note that node_modules and .git are ignored by default, but dotfiles are not: flat config lints them where eslintrc skipped them, so a migrated project may need an explicit ignore for directories such as .next or .wrangler.
Source: https://eslint.org/docs/latest/use/configure/ignore
eslintjavascript
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