fix(no-unused-class-name): added support for class attributes with multiple spaces, newlines and tabs

Author: marekdedic

src/rules/no-unused-class-name.ts

@@ -75,7 +75,7 @@ function findClassesInAttribute(
 ): string[] {
   if (attribute.type === "SvelteAttribute" && attribute.key.name === "class") {
     return attribute.value.flatMap((value) =>
-      value.type === "SvelteLiteral" ? value.value.split(" ") : [],
+      value.type === "SvelteLiteral" ? value.value.trim().split(/\s+/u) : [],
     )
   }
   if (attribute.type === "SvelteDirective" && attribute.kind === "Class") {

tests/fixtures/rules/no-unused-class-name/invalid/multiline-class-names01-errors.yaml

@@ -0,0 +1,12 @@
+- message: Unused class "div-class-two".
+  line: 1
+  column: 1
+  suggestions: null
+- message: Unused class "span-class-two".
+  line: 3
+  column: 1
+  suggestions: null
+- message: Unused class "span-class-three".
+  line: 3
+  column: 1
+  suggestions: null

tests/fixtures/rules/no-unused-class-name/invalid/multiline-class-names01-input.svelte

@@ -0,0 +1,18 @@
+<div class="div-class	div-class-two">Hello</div>
+
+<span
+  class="
+    span-class
+    span-class-two
+    span-class-three
+  ">World!</span>
+
+<style>
+  .div-class {
+    color: red;
+  }
+
+  .span-class {
+    font-weight: bold;
+  }
+</style>