@mkaradeniz/oxlint-plugin-array

Oxlint rules for treating arrays as immutable by default.

Install

pnpm add -D @mkaradeniz/oxlint-plugin-array

Usage

import { defineConfig } from 'oxlint';

export default defineConfig({
  jsPlugins: [
    {
      name: '@mkaradeniz/array',
      specifier: '@mkaradeniz/oxlint-plugin-array',
    },
  ],
  rules: {
    '@mkaradeniz/array/no-mutation': ['warn'],
  },
});

Rules

• @mkaradeniz/array/no-mutation: reports syntactically obvious calls to mutating array methods on existing values. It skips clearly fresh temporary arrays such as literals, spread copies, Array.from, .slice(), and .concat() chains. It fixes only mechanically safe cases: value-producing sort, reverse, and splice calls become toSorted, toReversed, and toSpliced; simple expression-statement push, pop, shift, and unshift calls on stable assignable receivers become immutable reassignment patterns. Ambiguous receivers, mutating return values, optional assignment cases, fill, and copyWithin report without fixes.