eslint/no-class-assign Correctness

✅ This rule is turned on by default.

Disallow reassigning class variables.

This rule can be disabled for TypeScript code, as the TypeScript compiler enforces this check.

ClassDeclaration creates a variable that can be re-assigned, but the re-assignment is a mistake in most cases.

Examples of incorrect code for this rule:

javascript

class A {}
A = 0;

javascript

A = 0;
class A {}

javascript

class A {
  b() {
    A = 0;
  }
}

javascript

let A = class A {
  b() {
    A = 0;
    // `let A` is shadowed by the class name.
  }
};

Examples of correct code for this rule:

javascript

let A = class A {};
A = 0; // A is a variable.

javascript

let A = class {
  b() {
    A = 0; // A is a variable.
  }
};

javascript

class A {
  b(A) {
    A = 0; // A is a parameter.
  }
}

How to use

To enable this rule using the config file or in the CLI, you can use:

Config (.oxlintrc.json)Config (oxlint.config.ts)CLI

json

{
  "rules": {
    "no-class-assign": "error"
  }
}

import { defineConfig } from "oxlint";

export default defineConfig({
  rules: {
    "no-class-assign": "error",
  },
});

bash

oxlint --deny no-class-assign

This rule was added in v0.0.3.