# [9.0.0](https://github.com/eslint-functional/eslint-plugin-functional/compare/v8.0.0...v9.0.0) (2025-02-23) ### Features * **immutable-data:** add support for detecting map and set mutations ([#935](https://github.com/eslint-functional/eslint-plugin-functional/issues/935)) ([0386f3a](https://github.com/eslint-functional/eslint-plugin-functional/commit/0386f3a3a44457dcab78df3f6583e8c3aa6194c4)), closes [#934](https://github.com/eslint-functional/eslint-plugin-functional/issues/934) ### BREAKING CHANGES * **immutable-data:** map and set mutations will now be reported