- Flat config becomes the default: ESLint is renamed from FlatESLint, string config support and many formatters are removed, and new APIs like loadESLint() are added.
- Several breaking changes to rule schemas, RuleTester behavior, and deprecated context methods, plus new options for rules such as no‑unused‑vars and no‑restricted‑imports.
- Extensive feature additions including stricter rule test validations, performance statistics for flat ESLint, new suggestions (e.g., isnan in indexOf), and many new rule options.
v9.0.0
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Added handling for underflow without loss of precision and introduced checkConditionalExpressions to avoid unmodified loop conditions.
Fixed ASI hazard handling and false positives in various linting rules (e.g., no unused labels, getters, and unused vars).
Export ConfigObject from eslint/config to enable external usage.