#no-unassigned-vars

#Configuration

import { defineConfig, js } from '@rslint/core';

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

#Rule Details

This rule reports let and var variables that are read but never assigned a value. These variables are always undefined, so reading them is usually a programming mistake.

Examples of incorrect code for this rule:

let status;
if (status === "ready") {
  console.log("Ready!");
}

let user;
greet(user);

function test() {
  let error;
  return error || "Unknown error";
}

Examples of correct code for this rule:

let message = "hello";
console.log(message);

let user;
user = getUser();
console.log(user.name);

let temp;

Examples of correct TypeScript code for this rule:

declare let value: number | undefined;
console.log(value);

declare module "my-module" {
  let value: string;
  export = value;
}

#Options

This rule has no options.

#Original Documentation

• ESLint rule: no-unassigned-vars