eslint-plugin-better-mutation

ESLint plugin (v2.1.0) that controls where mutation is allowed in JavaScript/TypeScript, preventing unsafe reassignment of shared variables (globals, parameters, closed-over variables) while permitting safe mutation of locally declared variables. Designed for functional programming style, with support for flat config (ESLint >=9) and classic config. Differentiates from eslint-plugin-immutable by allowing local mutation and providing safer defaults. Active development, monthly releases, peer dep eslint >=6.