fix(formatter/tailwindcss): nested class string doesn't respect singleQuote: true

apps/oxfmt/test/tailwindcss/tailwindcss.test.ts

@@ -1055,6 +1055,7 @@ describe("Tailwind CSS Sorting works with other options", () => {
     const input = `
       <div className={clsx('text-md before:content-["hello"]')}>Hello</div>;
       <div className={clsx("text-md before:content-['hello']")}>Hello</div>;
+      <div className={showLandingPage ? "container pb-6" : 'hidden'}>title</div>
     `;
 
     const result = await format("test.tsx", input, {
@@ -1067,6 +1068,7 @@ describe("Tailwind CSS Sorting works with other options", () => {
     expect(result.code).toMatchInlineSnapshot(`
       "<div className={clsx('text-md before:content-["hello"]')}>Hello</div>;
       <div className={clsx("text-md before:content-['hello']")}>Hello</div>;
+      <div className={showLandingPage ? 'container pb-6' : 'hidden'}>title</div>;
       "
     `);
   });
@@ -1075,6 +1077,7 @@ describe("Tailwind CSS Sorting works with other options", () => {
     const input = `
       <div className={clsx('text-md before:content-["hello"]')}>Hello</div>;
       <div className={clsx("text-md before:content-['hello']")}>Hello</div>;
+      <div className={showLandingPage ? "container pb-6" : 'hidden'}>title</div>
     `;
 
     const result = await format("test.tsx", input, {
@@ -1086,6 +1089,7 @@ describe("Tailwind CSS Sorting works with other options", () => {
     expect(result.code).toMatchInlineSnapshot(`
       "<div className={clsx('text-md before:content-["hello"]')}>Hello</div>;
       <div className={clsx("text-md before:content-['hello']")}>Hello</div>;
+      <div className={showLandingPage ? "container pb-6" : "hidden"}>title</div>;
       "
     `);
   });

crates/oxc_formatter/src/formatter/context.rs

@@ -14,8 +14,6 @@ use super::{Comments, SourceText};
 /// Entry in the Tailwind context stack, tracking whether we're inside a Tailwind class context.
 #[derive(Clone, Copy, Debug)]
 pub struct TailwindContextEntry {
-    /// Whether the context is inside a JSX attribute (affects quote style).
-    pub is_jsx: bool,
     /// Whether to preserve whitespace (newlines) in template literals.
     pub preserve_whitespace: bool,
     /// Whether we're inside a template literal expression (between `${` and `}`).
@@ -42,9 +40,8 @@ pub struct TailwindContextEntry {
 
 impl TailwindContextEntry {
     /// Create a new context entry for JSX attributes or function calls.
-    pub fn new(is_jsx: bool, preserve_whitespace: bool) -> Self {
+    pub fn new(preserve_whitespace: bool) -> Self {
         Self {
-            is_jsx,
             preserve_whitespace,
             in_template_expression: false,
             quasi_before_has_trailing_ws: true, // Default: can collapse
@@ -63,7 +60,6 @@ impl TailwindContextEntry {
         quasi_after_has_leading_ws: bool,
     ) -> Self {
         Self {
-            is_jsx: parent.is_jsx,
             preserve_whitespace: parent.preserve_whitespace,
             in_template_expression: true,
             quasi_before_has_trailing_ws,

crates/oxc_formatter/src/utils/tailwindcss.rs

@@ -210,7 +210,9 @@ pub fn write_tailwind_string_literal<'a>(
 
     let normalized_string = FormatLiteralStringToken::new(
         f.source_text().text_for(&string_literal),
-        ctx.is_jsx,
+        // `className="string"`
+        //            ^^^^^^^^
+        matches!(string_literal.parent, AstNodes::JSXAttribute(_)),
         StringLiteralParentKind::Expression,
     )
     .clean_text(f);

crates/oxc_formatter/src/write/jsx/mod.rs

@@ -332,7 +332,7 @@ impl<'a> FormatWrite<'a> for AstNode<'a, JSXAttribute<'a>> {
                 .experimental_tailwindcss
                 .as_ref()
                 .filter(|opts| is_tailwind_jsx_attribute(&self.name, opts))
-                .map(|opts| TailwindContextEntry::new(true, opts.preserve_whitespace));
+                .map(|opts| TailwindContextEntry::new(opts.preserve_whitespace));
 
             if let Some(ctx) = tailwind_ctx_to_push {
                 f.context_mut().push_tailwind_context(ctx);

crates/oxc_formatter/src/write/mod.rs

@@ -297,7 +297,7 @@ impl<'a> FormatWrite<'a> for AstNode<'a, CallExpression<'a>> {
                     f.options()
                         .experimental_tailwindcss
                         .as_ref()
-                        .map(|opts| TailwindContextEntry::new(false, opts.preserve_whitespace))
+                        .map(|opts| TailwindContextEntry::new(opts.preserve_whitespace))
                 } else {
                     None
                 };

crates/oxc_formatter/src/write/template.rs

@@ -61,7 +61,7 @@ impl<'a> FormatWrite<'a> for AstNode<'a, TaggedTemplateExpression<'a>> {
             .experimental_tailwindcss
             .as_ref()
             .filter(|opts| is_tailwind_function_call(&self.tag, opts))
-            .map(|opts| TailwindContextEntry::new(false, opts.preserve_whitespace));
+            .map(|opts| TailwindContextEntry::new(opts.preserve_whitespace));
 
         if let Some(ctx) = tailwind_ctx_to_push {
             f.context_mut().push_tailwind_context(ctx);