feat!: return ResolveError:Builtin("node:{specifier}") from package…

… imports and exports (#165)

closes #164

According to the ESM specification https://nodejs.org/api/esm.html#resolution-and-loading-algorithm

```
// PACKAGE_RESOLVE(packageSpecifier, parentURL)
// 3. If packageSpecifier is a Node.js builtin module name, then
//   1. Return the string "node:" concatenated with packageSpecifier.
```

The returned value should be prefixed by `node:`

fixtures/enhanced_resolve/test/fixtures/builtins/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "builtins",
+  "private": true,
+  "imports": {
+    "#fs": {
+      "default": "fs"
+    },
+    "#http": {
+      "node": "node:http"
+    }
+  }
+}

src/lib.rs

@@ -308,11 +308,19 @@ impl<Fs: FileSystem> ResolverGeneric<Fs> {
         }
     }
 
+    // PACKAGE_RESOLVE(packageSpecifier, parentURL)
+    // 3. If packageSpecifier is a Node.js builtin module name, then
+    //   1. Return the string "node:" concatenated with packageSpecifier.
     fn require_core(&self, specifier: &str) -> Result<(), ResolveError> {
-        if self.options.builtin_modules
-            && (specifier.starts_with("node:") || NODEJS_BUILTINS.binary_search(&specifier).is_ok())
-        {
-            return Err(ResolveError::Builtin(specifier.to_string()));
+        if self.options.builtin_modules {
+            let starts_with_node = specifier.starts_with("node:");
+            if starts_with_node || NODEJS_BUILTINS.binary_search(&specifier).is_ok() {
+                let mut specifier = specifier.to_string();
+                if !starts_with_node {
+                    specifier = format!("node:{specifier}");
+                }
+                return Err(ResolveError::Builtin(specifier));
+            }
         }
         Ok(())
     }
@@ -1118,6 +1126,11 @@ impl<Fs: FileSystem> ResolverGeneric<Fs> {
         ctx: &mut Ctx,
     ) -> ResolveResult {
         let (package_name, subpath) = Self::parse_package_specifier(specifier);
+
+        // 3. If packageSpecifier is a Node.js builtin module name, then
+        //   1. Return the string "node:" concatenated with packageSpecifier.
+        self.require_core(package_name)?;
+
         // 11. While parentURL is not the file system root,
         for module_name in &self.options.modules {
             for cached_path in std::iter::successors(Some(cached_path), |p| p.parent()) {

src/tests/builtins.rs

@@ -14,8 +14,7 @@ fn builtins_off() {
 fn builtins() {
     let f = Path::new("/");
 
-    let resolver =
-        Resolver::new(ResolveOptions { builtin_modules: true, ..ResolveOptions::default() });
+    let resolver = Resolver::new(ResolveOptions::default().with_builtin_modules(true));
 
     let pass = [
         "_http_agent",
@@ -86,13 +85,37 @@ fn builtins() {
     ];
 
     for request in pass {
-        let resolved_path = resolver.resolve(f, request).map(|r| r.full_path());
-        assert_eq!(resolved_path, Err(ResolveError::Builtin(request.to_string())), "{request}");
+        let prefixed_request = format!("node:{request}");
+        for request in [prefixed_request.clone(), request.to_string()] {
+            let resolved_path = resolver.resolve(f, &request).map(|r| r.full_path());
+            let err = ResolveError::Builtin(prefixed_request.clone());
+            assert_eq!(resolved_path, Err(err), "{request}");
+        }
     }
+}
 
-    for request in pass {
-        let request = format!("node:{request}");
-        let resolved_path = resolver.resolve(f, &request).map(|r| r.full_path());
-        assert_eq!(resolved_path, Err(ResolveError::Builtin(request.to_string())), "{request}");
+#[test]
+fn fail() {
+    let f = Path::new("/");
+    let resolver = Resolver::new(ResolveOptions::default().with_builtin_modules(true));
+    let request = "xxx";
+    let resolved_path = resolver.resolve(f, request);
+    let err = ResolveError::NotFound(request.to_string());
+    assert_eq!(resolved_path, Err(err), "{request}");
+}
+
+#[test]
+fn imports() {
+    let f = super::fixture().join("builtins");
+    let resolver = Resolver::new(ResolveOptions {
+        builtin_modules: true,
+        condition_names: vec!["node".into()],
+        ..ResolveOptions::default()
+    });
+
+    for request in ["#fs", "#http"] {
+        let resolved_path = resolver.resolve(f.clone(), request).map(|r| r.full_path());
+        let err = ResolveError::Builtin(format!("node:{}", request.trim_start_matches('#')));
+        assert_eq!(resolved_path, Err(err));
     }
 }