fix(linter/filename-case): fix default config when no config is provided (oxc-project#12389)

fixes oxc-project#12276

Author: camc314

crates/oxc_linter/src/rules/unicorn/filename_case.rs

@@ -23,7 +23,7 @@ impl std::ops::Deref for FilenameCase {
     }
 }
 
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone)]
 pub struct FilenameCaseConfig {
     /// Whether kebab case is allowed.
     kebab_case: bool,
@@ -37,6 +37,19 @@ pub struct FilenameCaseConfig {
     multi_extensions: bool,
 }
 
+impl Default for FilenameCaseConfig {
+    fn default() -> Self {
+        Self {
+            kebab_case: true,
+            camel_case: false,
+            snake_case: false,
+            pascal_case: false,
+            ignore: None,
+            multi_extensions: true,
+        }
+    }
+}
+
 declare_oxc_lint!(
     /// ### What it does
     ///
@@ -141,6 +154,7 @@ impl Rule for FilenameCase {
         let mut config = FilenameCaseConfig { multi_extensions: true, ..Default::default() };
 
         if let Some(value) = value.get(0) {
+            config.kebab_case = false;
             if let Some(Value::String(val)) = value.get("ignore") {
                 config.ignore = RegexBuilder::new(val).build().ok();
             }
@@ -380,6 +394,7 @@ fn test() {
             "src/foo/foo_bar.test_utils.js",
             serde_json::json!([{ "case": "snakeCase", "multipleFileExtensions": false }]),
         ),
+        ("", None, None, Some(PathBuf::from("foo-bar.tsx"))),
     ];
 
     let fail = vec![
@@ -425,6 +440,7 @@ fn test() {
             "src/foo/foo_bar.test-utils.js",
             serde_json::json!([{ "case": "snakeCase", "multipleFileExtensions": false }]),
         ),
+        ("", None, None, Some(PathBuf::from("FooBar.tsx"))),
     ];
 
     Tester::new(FilenameCase::NAME, FilenameCase::PLUGIN, pass, fail).test_and_snapshot();

crates/oxc_linter/src/snapshots/unicorn_filename_case.snap

@@ -155,3 +155,8 @@ source: crates/oxc_linter/src/tester.rs
    ╭─[filename_case.tsx:1:1]
    ╰────
   help: Rename the file to 'foo_bar.test_utils.js'
+
+  ⚠ eslint-plugin-unicorn(filename-case): Filename should be in kebab case
+   ╭─[filename_case.tsx:1:1]
+   ╰────
+  help: Rename the file to 'foo-bar.tsx'