+++ /dev/null
-# no-duplicate-selectors
-
-Disallow duplicate selectors within a stylesheet.
-
-```css
- .foo {} .bar {} .foo {}
-/** ↑ ↑
- * These duplicates */
-```
-
-This rule checks for two types of duplication:
-
-- Duplication of a single selector with a rule's selector list, e.g. `a, b, a {}`.
-- Duplication of a selector list within a stylesheet, e.g. `a, b {} a, b {}`. Duplicates are found even if the selectors come in different orders or have different spacing, e.g. `a d, b > c {} b>c, a d {}`.
-
-The same selector *is* allowed to repeat in the following circumstances:
-
-- It is used in different selector lists, e.g. `a {} a, b {}`.
-- The duplicates are determined to originate in different stylesheets, e.g. you have concatenated or compiled files in a way that produces sourcemaps for PostCSS to read, e.g. postcss-import).
-- The duplicates are in rules with different parent nodes, e.g. inside and outside of a media query.
-
-This rule resolves nested selectors. So `a b {} a { & b {} }` counts as a violation, because the resolved selectors end up with a duplicate.
-
-## Options
-
-### `true`
-
-The following patterns are considered violations:
-
-```css
-.foo,
-.bar,
-.foo {}
-```
-
-```css
-.foo {}
-.bar {}
-.foo {}
-```
-
-```css
-.foo .bar {}
-.bar {}
-.foo .bar {}
-```
-
-```css
-@media (min-width: 10px) {
- .foo {}
- .foo {}
-}
-```
-
-```css
-.foo, .bar {}
-.bar, .foo {}
-```
-
-```css
-a .foo, b + .bar {}
-b+.bar,
-a
- .foo {}
-```
-
-```css
-a b {}
-a {
- & b {}
-}
-```
-
-The following patterns are *not* considered violations:
-
-```css
-.foo {}
-@media (min-width: 10px) {
- .foo {}
-}
-```
-
-```css
-.foo {
- .foo {}
-}
-```
-
-```css
-.foo {}
-.bar {}
-.foo .bar {}
-.bar .foo {}
-```
-
-```css
-a b {}
-a {
- & b,
- & c {}
-}
-```