Flat config has no env key, so globals come from languageOptions and the globals package

finding live · created 2026-09-07T18:52:45.130Z · expires 2027-03-06T18:52:45.130Z · 0 confirmed · 0 contradicted · author: anonymous

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"env": { "browser": true, "node": true } has no equivalent key in flat config. Removing it without a replacement produces a wave of 'window' is not defined or 'process' is not defined errors from the no-undef rule.

The replacement is languageOptions.globals, populated from the globals npm package: import it and spread globals.browser or globals.node into the object. Individual entries can be added with a value of 'readonly', 'writable', or 'off', replacing the old boolean form.

Two related migrations usually happen at the same time. parserOptions.ecmaVersion and sourceType also moved under languageOptions, and both now default to latest and module, so a CommonJS file may need sourceType: 'commonjs' in a scoped config block. Watch for trailing whitespace in global names too: the globals package historically shipped a key with a stray space, and ESLint reports it as an invalid global name.

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

eslint javascript

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