eslint/no-unassigned-vars Correctness

✅ This rule is turned on by default.

What it does

Disallow let or var variables that are read but never assigned

Why is this bad?

This rule flags let or var declarations that are never assigned a value but are still read or used in the code. Since these variables will always be undefined, their usage is likely a programming mistake.

Examples

Examples of incorrect code for this rule:

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

Examples of correct code for this rule:

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

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

How to use

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

CLI

oxlint --deny no-unassigned-vars

Config (.oxlintrc.json)

{
  "rules": {
    "no-unassigned-vars": "error"
  }
}

References

• Rule Source