feat(oxfmt): Search both .json and .jsonc config file (#14848)

Fixes #14575

Author: leaysgur

apps/oxfmt/src/format.rs

@@ -181,9 +181,15 @@ fn load_config(cwd: &Path, config_path: Option<&PathBuf>) -> Result<FormatOption
         })
     } else {
         // If `--config` is not specified, search the nearest config file from cwd upwards
+        // Support both `.json` and `.jsonc`, but prefer `.json` if both exist
         cwd.ancestors().find_map(|dir| {
-            let config_path = dir.join(".oxfmtrc.json");
-            if config_path.exists() { Some(config_path) } else { None }
+            for filename in [".oxfmtrc.json", ".oxfmtrc.jsonc"] {
+                let config_path = dir.join(filename);
+                if config_path.exists() {
+                    return Some(config_path);
+                }
+            }
+            None
         })
     };
 

apps/oxfmt/tests/fixtures/config_file/.oxfmtrc.jsonc

@@ -0,0 +1,3 @@
+{
+  "semi": false
+}

apps/oxfmt/tests/mod.rs

@@ -61,6 +61,8 @@ fn write_mode() {
 
 #[test]
 fn config_file_auto_discovery() {
+    // Tests .json takes priority over .jsonc when both exist
+    // config_file/ has both .oxfmtrc.json (semi: true) and .oxfmtrc.jsonc (semi: false)
     Tester::new()
         .with_cwd(PathBuf::from("tests/fixtures/config_file"))
         .test_and_snapshot_multiple("config_file_auto_discovery", &[&["--check"]]);