#comma-spacing

#Configuration

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

export default defineConfig([
  stylisticPlugin.configs.recommended,
  {
    rules: {
      '@stylistic/comma-spacing': 'error',
    },
  },
]);

Enforce consistent spacing before and after commas.

#Rule Details

This rule normalizes the whitespace around the , separator in variable declarations, array literals, array destructuring patterns, object literals, object destructuring patterns, function parameter lists, function call arguments, sequence expressions, and TypeScript-specific list-shaped syntax (type arguments, type parameters, tuple types, enum members, import / export specifiers, heritage clauses).

The rule does not apply between:

• Two consecutive commas ([1, , 2] — the comma terminating the null slot is exempt)
• A comma and the immediately following ), ], or } (delegated to dedicated bracket-spacing rules)
• A comma and the immediately following line comment when the option forbids a space after — removing the space would fuse the comma into //

Examples of incorrect code for this rule with the default { "before": false, "after": true } option:

var foo = 1 ,bar = 2;
var arr = [1 , 2];
var obj = { foo: 'bar' ,baz: 'qur' };
foo(a ,b);
type Foo<T ,P> = Bar<T ,P>;

Examples of correct code for this rule with the default { "before": false, "after": true } option:

var foo = 1, bar = 2;
var arr = [1, 2];
var obj = { foo: 'bar', baz: 'qur' };
foo(a, b);
type Foo<T, P> = Bar<T, P>;

#Options

This rule has an object option:

• "before": false (default) forbids a space before the comma. Set to true to require one.
• "after": true (default) requires a space after the comma. Set to false to forbid one.

Either key may be omitted; a missing key falls back to its default.

#before

Examples of incorrect code for this rule with the { "before": true } option:

{ "@stylistic/comma-spacing": ["error", { "before": true }] }

var foo = 1, bar = 2;
var arr = [1, 2];
foo(a, b);

Examples of correct code for this rule with the { "before": true } option:

{ "@stylistic/comma-spacing": ["error", { "before": true }] }

var foo = 1 , bar = 2;
var arr = [1 , 2];
foo(a , b);

#after

Examples of incorrect code for this rule with the { "after": false } option:

{ "@stylistic/comma-spacing": ["error", { "after": false }] }

var foo = 1, bar = 2;
var arr = [1, 2];
foo(a, b);

Examples of correct code for this rule with the { "after": false } option:

{ "@stylistic/comma-spacing": ["error", { "after": false }] }

var foo = 1,bar = 2;
var arr = [1,2];
foo(a,b);

#Original Documentation

• @stylistic/comma-spacing