function-parentheses-space-inside

Require a single space or disallow whitespace on the inside of the parentheses of functions.

a { transform: translate( 1, 1 ); }
/**                     ↑      ↑
 * The space inside these two parentheses */

The fix option can automatically fix the problems reported by this rule, except where the whitespace holds the line break closing an inline comment: writing over it would move code into the comment, so the whitespace is left alone and the warning stands.

Options

string: "always"|"never"|"always-single-line"|"never-single-line"

"always"

There must always be a single space inside of the parentheses.

The following patterns are considered problems:

a { transform: translate(1, 1); }

a { transform: translate(1, 1 ); }

The following patterns are not considered problems:

a { transform: translate( 1, 1 ); }

"never"

There must never be whitespace on the inside of the parentheses.

The following patterns are considered problems:

a { transform: translate( 1, 1 ); }

a { transform: translate(1, 1 ); }

The following patterns are not considered problems:

a { transform: translate(1, 1); }

"always-single-line"

There must always be a single space inside the parentheses of single-line functions.

The following patterns are considered problems:

a { transform: translate(1, 1) }

a { transform: translate(1, 1 ) }

The following patterns are not considered problems:

a { transform: translate( 1, 1 ) }

a { transform: translate(1,
  1) }

a {
  transform: translate(
    1,
    1
  )
}

"never-single-line"

There must never be whitespace inside the parentheses of single-line functions.

The following patterns are considered problems:

a { transform: translate( 1, 1 ) }

a { transform: translate(1, 1 ) }

The following patterns are not considered problems:

a { transform: translate(1, 1) }

a { transform: translate( 1,
  1) }

a {
  transform: translate(
    1,
    1
  )
}