Allow sorting classes inside function calls in Twig templates

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Improved monorepo support by loading v3 configs relative to the input file instead of prettier config file ([#386](https://github.com/tailwindlabs/prettier-plugin-tailwindcss/pull/386))
 - Fix whitespace removal inside nested concat and template expressions ([#396](https://github.com/tailwindlabs/prettier-plugin-tailwindcss/pull/396))
 - Fallback to Tailwind CSS v4 instead of v3 by default ([#390](https://github.com/tailwindlabs/prettier-plugin-tailwindcss/pull/390))
+- Support sorting in function calls in Twig ([#358](https://github.com/tailwindlabs/prettier-plugin-tailwindcss/pull/358))
 
 ## [0.6.14] - 2025-07-09
 

src/index.ts

@@ -859,7 +859,7 @@ function transformMarko(ast: any, { env }: TransformerContext) {
 }
 
 function transformTwig(ast: any, { env, changes }: TransformerContext) {
-  let { staticAttrs } = env.customizations
+  let { staticAttrs, functions } = env.customizations
 
   for (let child of ast.expressions ?? []) {
     transformTwig(child, { env, changes })
@@ -872,6 +872,31 @@ function transformTwig(ast: any, { env, changes }: TransformerContext) {
       meta.sortTextNodes = true
     },
 
+    CallExpression(node, _path, meta) {
+      // Traverse property accesses and function calls to find the *trailing* ident
+      while (
+        node.type === 'CallExpression' ||
+        node.type === 'MemberExpression'
+      ) {
+        if (node.type === 'CallExpression') {
+          node = node.callee
+        } else if (node.type === 'MemberExpression') {
+          // TODO: This is *different* than `isSortableExpression` and that doesn't feel right
+          // but they're mutually exclusive implementations
+          //
+          // This is to handle foo.fnNameHere(…) where `isSortableExpression` is intentionally
+          // handling `fnNameHere.foo(…)`.
+          node = node.property
+        }
+      }
+
+      if (node.type === 'Identifier') {
+        if (!functions.has(node.name)) return
+      }
+
+      meta.sortTextNodes = true
+    },
+
     StringLiteral(node, path, meta) {
       if (!meta.sortTextNodes) {
         return

tests/plugins.test.ts

@@ -136,6 +136,7 @@ let tests: PluginTest[] = [
     plugins: ['@zackad/prettier-plugin-twig'],
     options: {
       twigAlwaysBreakObjects: false,
+      tailwindFunctions: ['addClass', 'tw'],
     },
     tests: {
       twig: [
@@ -161,6 +162,22 @@ let tests: PluginTest[] = [
           `<div class="{{ ' flex ' + ' underline ' + ' block ' }}"></div>`,
           `<div class="{{ 'flex ' + ' underline' + ' block' }}"></div>`,
         ],
+
+        // Function call tests
+        t`<div {{ tw('${yes}') }}></div>`,
+        t`<div {{ attributes.addClass('${yes}') }}></div>`,
+
+        t`{{ tw('${yes}') }}`,
+        t`{{ attributes.addClass('${yes}') }}`,
+
+        t`{{ tw('${yes}').tw('${yes}').tw('${yes}') }}`,
+        t`{{ attributes.addClass('${yes}').addClass('${yes}').addClass('${yes}') }}`,
+
+        t`{% set className = '${no}' %} {{ attributes.addClass(className) }}`,
+        [
+          `{{ attributes.addClass("sm:p-0 " ~ variant ~ " p-0") }}`,
+          `{{ attributes.addClass('sm:p-0 ' ~ variant ~ ' p-0') }}`,
+        ],
       ],
     },
   },