Ignore binary extensions, except in folder names (#17595)

We generate a glob to ignore binary extensions that looks something like
this:
```
*.{mp4,pages,exe,…}
```

However, if you have a folder that happens to end in `.pages` for
example, then this folder will be ignored in its entirety.

To solve this, we added a new flag to the `Gitignore` struct so we can
register a bunch of ignore rules that _only_ apply to paths and not
folders.

Fixes: #17569

## Test plan

- Added a unit test

---------

Co-authored-by: Philipp Spiess <hello@philippspiess.com>

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Ensure container query variant names can contain hyphens ([#17628](https://github.com/tailwindlabs/tailwindcss/pull/17628))
 - Ensure `shadow-inherit`, `inset-shadow-inherit`, `drop-shadow-inherit`, and `text-shadow-inherit` inherits the shadow color ([#17647](https://github.com/tailwindlabs/tailwindcss/pull/17647))
 - Ensure compatibility with array tuples used in `fontSize` JS theme keys ([#17630](https://github.com/tailwindlabs/tailwindcss/pull/17630))
+- Ensure folders with binary file extensions in its name are scanned for utilities ([#17595](https://github.com/tailwindlabs/tailwindcss/pull/17595))
 - Upgrade: Convert `fontSize` array tuple syntax to CSS theme variables ([#17630](https://github.com/tailwindlabs/tailwindcss/pull/17630))
 
 ## [4.1.3] - 2025-04-04

crates/ignore/src/gitignore.rs

@@ -85,6 +85,8 @@ pub struct Gitignore {
     num_ignores: u64,
     num_whitelists: u64,
     matches: Option<Arc<Pool<Vec<usize>>>>,
+    // CHANGED: Add a flag to have Gitignore rules that apply only to files.
+    only_on_files: bool,
 }
 
 impl Gitignore {
@@ -140,6 +142,8 @@ impl Gitignore {
             num_ignores: 0,
             num_whitelists: 0,
             matches: None,
+            // CHANGED: Add a flag to have Gitignore rules that apply only to files.
+            only_on_files: false,
         }
     }
 
@@ -240,6 +244,10 @@ impl Gitignore {
         if self.is_empty() {
             return Match::None;
         }
+        // CHANGED: Rules marked as only_on_files can not match against directories.
+        if self.only_on_files && is_dir {
+            return Match::None;
+        }
         let path = path.as_ref();
         let mut matches = self.matches.as_ref().unwrap().get();
         let candidate = Candidate::new(path);
@@ -295,6 +303,8 @@ pub struct GitignoreBuilder {
     root: PathBuf,
     globs: Vec<Glob>,
     case_insensitive: bool,
+    // CHANGED: Add a flag to have Gitignore rules that apply only to files.
+    only_on_files: bool,
 }
 
 impl GitignoreBuilder {
@@ -311,6 +321,8 @@ impl GitignoreBuilder {
             root: strip_prefix("./", root).unwrap_or(root).to_path_buf(),
             globs: vec![],
             case_insensitive: false,
+            // CHANGED: Add a flag to have Gitignore rules that apply only to files.
+            only_on_files: false,
         }
     }
 
@@ -331,6 +343,8 @@ impl GitignoreBuilder {
             num_ignores: nignore as u64,
             num_whitelists: nwhite as u64,
             matches: Some(Arc::new(Pool::new(|| vec![]))),
+            // CHANGED: Add a flag to have Gitignore rules that apply only to files.
+            only_on_files: self.only_on_files,
         })
     }
 
@@ -514,6 +528,16 @@ impl GitignoreBuilder {
         self.case_insensitive = yes;
         Ok(self)
     }
+
+    /// CHANGED: Add a flag to have Gitignore rules that apply only to files.
+    ///
+    /// If this is set, then the globs will only be matched against file paths.
+    /// This will ensure that ignore rules like `*.pages` will _only_ ignore
+    /// files ending in `.pages` and not folders ending in `.pages`.
+    pub fn only_on_files(&mut self, yes: bool) -> &mut GitignoreBuilder {
+        self.only_on_files = yes;
+        self
+    }
 }
 
 /// Return the file path of the current environment's global gitignore file.

crates/oxide/src/scanner/auto_source_detection.rs

@@ -10,15 +10,21 @@ use std::sync;
 /// - Ignoring common binary file extensions like `.png` and `.jpg`
 /// - Ignoring common files like `yarn.lock` and `package-lock.json`
 ///
-pub static RULES: sync::LazyLock<Gitignore> = sync::LazyLock::new(|| {
+pub static RULES: sync::LazyLock<Vec<Gitignore>> = sync::LazyLock::new(|| {
     let mut builder = GitignoreBuilder::new("");
 
     builder.add_line(None, &IGNORED_CONTENT_DIRS_GLOB).unwrap();
     builder.add_line(None, &IGNORED_EXTENSIONS_GLOB).unwrap();
-    builder.add_line(None, &BINARY_EXTENSIONS_GLOB).unwrap();
     builder.add_line(None, &IGNORED_FILES_GLOB).unwrap();
 
-    builder.build().unwrap()
+    // Ensure these rules do not match on folder names
+    let mut file_only_builder = GitignoreBuilder::new("");
+    file_only_builder
+        .only_on_files(true)
+        .add_line(None, &BINARY_EXTENSIONS_GLOB)
+        .unwrap();
+
+    vec![builder.build().unwrap(), file_only_builder.build().unwrap()]
 });
 
 pub static IGNORED_CONTENT_DIRS: sync::LazyLock<Vec<&'static str>> = sync::LazyLock::new(|| {

crates/oxide/src/scanner/mod.rs

@@ -630,7 +630,9 @@ fn create_walker(sources: Sources) -> Option<WalkBuilder> {
     }
 
     // Setup auto source detection rules
-    builder.add_gitignore(auto_source_detection::RULES.clone());
+    for ignore in auto_source_detection::RULES.iter() {
+        builder.add_gitignore(ignore.clone());
+    }
 
     // Setup ignores based on `@source` definitions
     for (base, patterns) in ignores {

crates/oxide/tests/scanner.rs

@@ -311,6 +311,31 @@ mod scanner {
         assert_eq!(normalized_sources, vec!["**/*"]);
     }
 
+    // https://github.com/tailwindlabs/tailwindcss/issues/17569
+    #[test]
+    fn it_should_not_ignore_folders_that_end_with_a_binary_extension() {
+        let ScanResult {
+            files,
+            globs,
+            normalized_sources,
+            ..
+        } = scan(&[
+            // Looks like `.pages` binary extension, but it's a folder
+            ("some.pages/index.html", "content-['some.pages/index.html']"),
+            // Ignore a specific folder. This is to ensure that this still "wins" from the internal
+            // solution of dealing with binary extensions for files only.
+            (".gitignore", "other.pages"),
+            (
+                "other.pages/index.html",
+                "content-['other.pages/index.html']",
+            ),
+        ]);
+
+        assert_eq!(files, vec!["some.pages/index.html"]);
+        assert_eq!(globs, vec!["*", "some.pages/**/*.{aspx,astro,cjs,cts,eex,erb,gjs,gts,haml,handlebars,hbs,heex,html,jade,js,jsx,liquid,md,mdx,mjs,mts,mustache,njk,nunjucks,php,pug,py,razor,rb,rhtml,rs,slim,svelte,tpl,ts,tsx,twig,vue}"]);
+        assert_eq!(normalized_sources, vec!["**/*"]);
+    }
+
     #[test]
     fn it_should_ignore_known_extensions() {
         let ScanResult {