ESLint plugin that enforces immutable JavaScript by prohibiting mutation, let/var declarations, and this usage.
eslint-plugin-immutable is an ESLint plugin that enforces immutable programming patterns in JavaScript by disabling mutation, `let`/`var` declarations, and `this` usage. It helps developers write side-effect-free code, particularly in Redux and React applications, by promoting functional programming principles and preventing common state-related bugs.
JavaScript developers working with Redux and React who want to enforce immutable data structures and functional programming practices in their codebases. It's also suitable for teams adopting Elm-like architectures or seeking to reduce mutation-related bugs.
Developers choose this plugin because it provides a zero-cost, compile-time enforcement of immutability without runtime overhead. It integrates seamlessly with ESLint, offers clear rules that align with modern React/Redux best practices, and encourages writing more predictable and maintainable code.
ESLint plugin to disable all mutation in JavaScript.
Open-Awesome is built by the community, for the community. Submit a project, suggest an awesome list, or help improve the catalog on GitHub.
Disallows let, var, and object mutation through rules like no-let and no-mutation, forcing functional patterns that prevent state bugs, as emphasized in the README for Redux/React ecosystems.
Unlike Object.freeze(), the no-mutation rule operates at lint time with no run-time cost, providing compile-time checks without performance penalties, as highlighted in the README.
Encourages stateless functional components and libraries like recompose via the no-this rule, aligning with React's shift away from classes and improving code composability.
Easily plugs into existing ESLint configurations with a simple setup, demonstrated by the sample configuration file for quick adoption and team enforcement.
Bans common JavaScript constructs like this and let, which can be necessary in projects outside strict Redux/React setups or when dealing with legacy code, limiting adaptability.
The README admits that additional ESLint rules like no-param-reassign are needed to fully eliminate mutation, adding configuration complexity and potential oversight.
Requires a paradigm shift to functional programming, which can be challenging for teams accustomed to imperative or object-oriented styles, slowing initial adoption.