eslint/one-var Style

🛠️ An auto-fix is available for this rule for some violations.

What it does

Enforces variables to be declared either together or separately.

Why is this bad?

Consistent declaration grouping makes variable lifetimes and initialization patterns easier to scan. This rule can require one declaration per scope, one declarator per statement, or grouping only consecutive declarations.

Examples

Examples of incorrect code for this rule:

var foo = 1;
var bar = 2;

Examples of correct code for this rule:

var foo = 1,
  bar = 2;

Configuration

Enforces consistent grouping of variable declarations.

type: object

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": {
    "one-var": "error"
  }
}

import { defineConfig } from "oxlint";

export default defineConfig({
  rules: {
    "one-var": "error",
  },
});

bash

oxlint --deny one-var

Version

This rule was added in v1.78.0.

What it does ​

Why is this bad? ​

Examples ​

Configuration ​

How to use ​

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