fix(node): resolve .css files in npm packages when type checking (#22804)

When type checking, we should just resolve css files in npm packages and
not surface a type checking error on the specifier.

ext/node/resolution.rs

@@ -518,6 +518,10 @@ impl NodeResolver {
         return Some(path);
       }
     }
+    // allow resolving .css files for types resolution
+    if lowercase_path.ends_with(".css") {
+      return Some(path);
+    }
     None
   }
 

tests/integration/npm_tests.rs

@@ -2551,6 +2551,22 @@ console.log(getValue());
   output.assert_matches_text("Check file:///[WILDCARD]/main.ts\n");
 }
 
+#[test]
+fn check_css_package_json_exports() {
+  let test_context = TestContextBuilder::for_npm().use_temp_cwd().build();
+  let dir = test_context.temp_dir();
+  dir.write(
+    "main.ts",
+    r#"import "npm:@denotest/css-export/dist/index.css";"#,
+  );
+  test_context
+    .new_command()
+    .args("check main.ts")
+    .run()
+    .assert_matches_text("Download [WILDCARD]css-export\nDownload [WILDCARD]css-export/1.0.0.tgz\nCheck [WILDCARD]/main.ts\n")
+    .assert_exit_code(0);
+}
+
 #[test]
 fn cjs_export_analysis_require_re_export() {
   let test_context = TestContextBuilder::for_npm().use_temp_cwd().build();

tests/testdata/npm/registry/@denotest/css-export/1.0.0/dist/index.css

@@ -0,0 +1 @@
+body {}

tests/testdata/npm/registry/@denotest/css-export/1.0.0/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "@denotest/css-export",
+  "version": "1.0.0",
+  "type": "module",
+  "exports": {
+    ".": "./index.js",
+    "./dist/*": "./dist/*"
+  }
+}