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@stylistic/

one-var-declaration-per-line

Some developers declare multiple var statements on the same line:

js
var foo, bar, baz;

Others prefer to declare one var per line.

js
var foo,
    bar,
    baz;

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.

Options

This rule has a single string option:

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

initializations

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

js
/*eslint @stylistic/one-var-declaration-per-line: ["error", "initializations"]*/
/*eslint-env es6*/

var a, b, 
c = 0
;
let d, e = 0,
f
;
incorrect

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

js
/*eslint @stylistic/one-var-declaration-per-line: ["error", "initializations"]*/
/*eslint-env es6*/

var a, b;

let c,
    d;

let e,
    f = 0;
correct

always

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

js
/*eslint @stylistic/one-var-declaration-per-line: ["error", "always"]*/
/*eslint-env es6*/

var a, 
b
;
let c,
d = 0
;
const e = 0,
f = 0
;
incorrect

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

js
/*eslint @stylistic/one-var-declaration-per-line: ["error", "always"]*/
/*eslint-env es6*/

var a,
    b;

let c,
    d = 0;
correct

Released under the MIT License.