fix(linter): do not use nested configs with --config option

apps/oxlint/fixtures/nested_config/oxlint-no-console.json

@@ -0,0 +1,6 @@
+{
+  "rules": {
+    "no-console": "error",
+    "no-debugger": "off"
+  }
+}

apps/oxlint/src/lint.rs

@@ -175,7 +175,12 @@ impl Runner for LintRunner {
         let mut nested_oxlintrc = FxHashMap::<&Path, Oxlintrc>::default();
         let mut nested_configs = FxHashMap::<PathBuf, ConfigStore>::default();
 
-        if experimental_nested_config {
+        let use_nested_config =
+            // If the `--config` option is explicitly passed, we should not search for nested config files
+            // as the passed config file takes absolute precedence.
+            basic_options.config.is_none();
+
+        if experimental_nested_config && use_nested_config {
             // get all of the unique directories among the paths to use for search for
             // oxlint config files in those directories
             // e.g. `/some/file.js` and `/some/other/file.js` would both result in `/some`
@@ -941,4 +946,12 @@ mod test {
         let args = &["--experimental-nested-config"];
         Tester::new().with_cwd("fixtures/nested_config".into()).test_and_snapshot(args);
     }
+
+    #[test]
+    fn test_nested_config_precedence() {
+        // `--config` takes absolute precedence over nested configs, and will be used for
+        // linting all files rather than the nested configuration files.
+        let args = &["--experimental-nested-config", "--config", "oxlint-no-console.json"];
+        Tester::new().with_cwd("fixtures/nested_config".into()).test_and_snapshot(args);
+    }
 }

apps/oxlint/src/snapshots/fixtures__nested_config_--experimental-nested-config --config oxlint-no-console.json@oxlint.snap

@@ -0,0 +1,43 @@
+---
+source: apps/oxlint/src/tester.rs
+---
+########## 
+arguments: --experimental-nested-config --config oxlint-no-console.json
+working directory: fixtures/nested_config
+----------
+
+  x ]8;;https://oxc.rs/docs/guide/usage/linter/rules/eslint/no-console.html\eslint(no-console)]8;;\: eslint(no-console): Unexpected console statement.
+   ,-[console.ts:1:1]
+ 1 | console.log("test");
+   : ^^^^^^^^^^^
+   `----
+  help: Delete this console statement.
+
+  x ]8;;https://oxc.rs/docs/guide/usage/linter/rules/eslint/no-console.html\eslint(no-console)]8;;\: eslint(no-console): Unexpected console statement.
+   ,-[package1-empty-config/console.ts:1:1]
+ 1 | console.log("test");
+   : ^^^^^^^^^^^
+   `----
+  help: Delete this console statement.
+
+  x ]8;;https://oxc.rs/docs/guide/usage/linter/rules/eslint/no-console.html\eslint(no-console)]8;;\: eslint(no-console): Unexpected console statement.
+   ,-[package2-no-config/console.ts:1:1]
+ 1 | console.log("test");
+   : ^^^^^^^^^^^
+   `----
+  help: Delete this console statement.
+
+  x ]8;;https://oxc.rs/docs/guide/usage/linter/rules/eslint/no-console.html\eslint(no-console)]8;;\: eslint(no-console): Unexpected console statement.
+   ,-[package3-deep-config/src/components/component.js:2:3]
+ 1 | export function Component() {
+ 2 |   console.log("hello");
+   :   ^^^^^^^^^^^
+ 3 | }
+   `----
+  help: Delete this console statement.
+
+Found 0 warnings and 4 errors.
+Finished in <variable>ms on 7 files with 97 rules using 1 threads.
+----------
+CLI result: LintFoundErrors
+----------