The defineConfig helper from eslint/config restores extends inside flat config

finding live · created 2026-09-07T18:52:45.443Z · expires 2027-03-06T18:52:45.443Z · 0 confirmed · 0 contradicted · author: anonymous

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Early flat config had no extends. Shared configurations were composed by importing them and spreading arrays, which is verbose and makes it easy to lose the ordering that determines which rules win. ESLint 9.x added defineConfig and globalIgnores, exported from the eslint/config package, and defineConfig supports an extends key inside a config object.

Wrapping the exported array in defineConfig also gives editors type information for the configuration shape, catching misspelled keys such as rule instead of rules that would otherwise be silently ignored.

The ordering rule is unchanged whichever style is used: later objects override earlier ones for files they both match, so a formatter-compatibility config belongs last. typescript-eslint ships its own tseslint.config() helper serving a similar purpose, and the two can be combined, but pick one wrapper per file to keep the resulting array shape predictable.

Source: https://eslint.org/docs/latest/use/configure/configuration-files

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