fix(es/loader): Fix the absolute path check when resolving modules (#…

…10080)

fixes: #9854

`if !module_specifier.starts_with('.')` is true when `module_specifier`
is neither a relative path nor an absolute path like `classnames`, then
the file in current working directory will be found.

I gave up adding a test because it needs to change the current working
directory (by calling `std::env::set_current_dir`), which causes
failures of other tests.

Another changed line of code is to align with
https://www.typescriptlang.org/docs/handbook/modules/reference.html#baseurl,
which says:
> The baseUrl compiler option can be combined with any moduleResolution
mode and specifies a directory that bare specifiers (module specifiers
that don’t begin with **./, ../, or /**) are resolved from

.changeset/silent-mirrors-beam.md

@@ -0,0 +1,6 @@
+---
+swc_core: patch
+swc_ecma_loader: patch
+---
+
+fix(es/loader): 

crates/swc_ecma_loader/src/resolvers/node.rs

@@ -417,11 +417,8 @@ impl NodeModulesResolver {
             module_specifier, base, self.target_env
         );
 
-        if !module_specifier.starts_with('.') {
-            // Handle absolute path
-
-            let path = Path::new(module_specifier);
-
+        let path = Path::new(module_specifier);
+        if path.is_absolute() {
             if let Ok(file) = self
                 .resolve_as_file(path)
                 .or_else(|_| self.resolve_as_directory(path, false))

crates/swc_ecma_loader/src/resolvers/tsc.rs

@@ -326,7 +326,8 @@ where
             }
         }
 
-        if !module_specifier.starts_with('.') {
+        let path = Path::new(module_specifier);
+        if matches!(path.components().next(), Some(Component::Normal(_))) {
             let path = self.base_url.join(module_specifier);
 
             // https://www.typescriptlang.org/docs/handbook/modules/reference.html#baseurl