Merge pull request #256 from kristerkari/feature/no-duplicate-dollar-…

…variables-ignore-options

Add ignore options to no-duplicate-dollar-variables

src/rules/no-duplicate-dollar-variables/README.md

@@ -33,7 +33,23 @@ $a: 1;
 }
 ```
 
-The following patterns are *not* considered violations:
+```scss
+$a: 1;
+.b {
+  .c {
+    $a: 1;
+  }
+}
+```
+
+```scss
+$a: 1;
+@mixin b {
+  $a: 1;
+}
+```
+
+The following patterns are _not_ considered violations:
 
 ```scss
 $a: 1;
@@ -46,3 +62,82 @@ $a: 1;
   $b: 2;
 }
 ```
+
+### `ignoreInside: ["at-rule", "nested-at-rule"]`
+
+#### `"at-rule"`
+
+Ignores dollar variables that are inside both nested and non-nested at-rules (`@media`, `@mixin`, etc.).
+
+Given:
+
+```json
+{ "ignoreInside": ["at-rule"] }
+```
+
+The following patterns are _not_ considered warnings:
+
+```scss
+$a: 1;
+@mixin c {
+  $a: 1;
+}
+```
+
+```scss
+$a: 1;
+.b {
+  @mixin c {
+    $a: 1;
+  }
+}
+```
+
+#### `"nested-at-rule"`
+
+Ignores dollar variables that are inside nested at-rules (`@media`, `@mixin`, etc.).
+
+Given:
+
+```json
+{ "ignoreInside": ["nested-at-rule"] }
+```
+
+The following patterns are _not_ considered warnings:
+
+```scss
+$a: 1;
+.b {
+  @mixin c {
+    $a: 1;
+  }
+}
+```
+
+### `ignoreInsideAtRules: ["array", "of", "at-rules"]`
+
+Ignores all variables that are inside specified at-rules.
+
+Given:
+
+```json
+{ "ignoreInsideAtRules": ["if", "mixin"] }
+```
+
+The following patterns are _not_ considered warnings:
+
+```scss
+$a: 1;
+
+@mixin b {
+  $a: 2;
+}
+```
+
+```scss
+$a: 1;
+
+@if (true) {
+  $a: 2;
+}
+```