one-var-declaration-per-line

Require or disallow newlines around variable declarations

🔧

Some problems reported by this rule are automatically fixable by the --fix command line option

This rule was deprecated in ESLint v8.53.0. Please use the corresponding rule in @stylistic/eslint-plugin-js.

Some developers declare multiple var statements on the same line:

var foo, bar, baz;
1

Others prefer to declare one var per line.

var foo,
    bar,
    baz;
1
2
3

Keeping to one of these styles across a project’s codebase can help with maintaining code consistency.

Rule Details

This rule enforces a consistent newlines around variable declarations. This rule ignores variable declarations inside for loop conditionals.

This rule has a single string option:

"initializations" (default) enforces a newline around variable initializations
"always" enforces a newline around variable declarations

Examples of incorrect code for this rule with the default "initializations" option:

/*eslint one-var-declaration-per-line: ["error", "initializations"]*/

var a, b, c = 0;

let d,
    e = 0, f;
1
2
3
4
5
6

Examples of correct code for this rule with the default "initializations" option:

/*eslint one-var-declaration-per-line: ["error", "initializations"]*/

var a, b;

let c,
    d;

let e,
    f = 0;
1
2
3
4
5
6
7
8
9

Examples of incorrect code for this rule with the "always" option:

/*eslint one-var-declaration-per-line: ["error", "always"]*/

var a, b;

let c, d = 0;

const e = 0, f = 0;
1
2
3
4
5
6
7

Examples of correct code for this rule with the "always" option:

/*eslint one-var-declaration-per-line: ["error", "always"]*/

var a,
    b;

let c,
    d = 0;
1
2
3
4
5
6
7

This rule was introduced in ESLint v2.0.0-beta.3.

Edit this page