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Rslint

    no-const-assign

    Configuration

    PresetConfigured Value
    ✅ js.configs.recommended"error"
    rslint.config.ts
    import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-const-assign': 'error',
    },
  },
]);

    Rule Details

    Disallows reassigning const variables. Variables declared with const cannot be reassigned after their initial declaration. Attempting to modify them (via assignment, increment, decrement, or destructuring assignment) is always a mistake and would throw a TypeError at runtime.

    Examples of incorrect code for this rule:

    const x = 1;
x = 2;

const y = 0;
y++;

const { z } = obj;
z = 3;

const [a, b] = [1, 2];
[a, b] = [3, 4];

    Examples of correct code for this rule:

    const x = 1;
console.log(x);

let y = 0;
y = 1;

const obj = {};
obj.key = 'value'; // mutating properties is fine

    Original Documentation