# no-irregular-whitespace

Disallow weird/irregular whitespace.

ECMAScript allows a wide selection of unicode whitespace, they are however known to cause issues with various parsers, therefore they should never be used.

A lot of the whitespace is invisible, therefore is hard to detect, it may have been inserted by accident.

Whitespace such as line separator causes issues since line separators are not valid JSON which may cause many issues.

This rule disallows the following whitespace:

u000B - Line Tabulation (v) - <VT>
u000C - Form Feed (f) - <FF>
u00A0 - No-Break Space - <NBSP>
u0085 - Next Line
u1680 - Ogham Space Mark
u180E - Mongolian Vowel Separator - <MVS>
ufeff - Zero Width No-Break Space - <BOM>
u2000 - En Quad
u2001 - Em Quad
u2002 - En Space - <ENSP>
u2003 - Em Space - <EMSP>
u2004 - Tree-Per-Em
u2005 - Four-Per-Em
u2006 - Six-Per-Em
u2007 - Figure Space
u2008 - Punctuation Space - <PUNCSP>
u2009 - Thin Space
u200A - Hair Space
u200B - Zero Width Space - <ZWSP>
u2028 - Line Separator
u2029 - Paragraph Separator
u202F - Narrow No-Break Space
u205f - Medium Mathematical Space
u3000 - Ideographic Space

# Config

Name	Type	Description
`skipStrings`	bool	Whether to allow any whitespace in string literals (true by default)
`skipComments`	bool	Whether to allow any whitespace in comments (false by default)
`skipRegex`	bool	Whether to allow any whitespace in regular expressions (false by default)
`skipTemplates`	bool	Whether to allow any whitespace in template literals (false by default)

More incorrect examples

var any  = 'thing';

var any  = 'thing';

var any   = 'thing';

var any  = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any 
 = 'thing';

var any   = 'thing';

var any   = 'thing';

var any   = 'thing';

var any 　 = 'thing';

More correct examples

'u{000B}';

'u{000C}';

'u{0085}';

'u{00A0}';

'u{180E}';

'u{feff}';

'u{2000}';

'u{2001}';

'u{2002}';

'u{2003}';

'u{2004}';

'u{2005}';

'u{2006}';

'u{2007}';

'u{2008}';

'u{2009}';

'u{200A}';

'u{200B}';

'u{2028}';

'u{2029}';

'u{202F}';

'u{205f}';

'u{3000}';

'';

'';

'
';

' ';

'᠎';

'';

' ';

Source (opens new window)

← no-inner-declarations no-new-symbol →