fix(core): fix a bug where a package's code could not load its own package

fixtures/test_modules/test-react-dom.js

@@ -0,0 +1,7 @@
+const assert = require("assert");
+
+import * as dom1 from "elem-react-dom/server.edge";
+assert.ok(dom1.name == "react-dom/server.edge");
+
+const dom2 = require("elem-react-dom/server.edge");
+assert.ok(dom2.name == "react-dom/server.edge");

llrt_core/src/module_loader/resolver.rs

@@ -168,7 +168,7 @@ pub fn require_resolve<'a>(
     // 5. LOAD_PACKAGE_SELF(X, dirname(Y))
     if let Ok(Some(path)) = load_package_self(ctx, x, &dirname_y, is_esm) {
         trace!("+- Resolved by `LOAD_PACKAGE_SELF`: {}\n", path);
-        return to_abs_path(path.into());
+        return Ok(path.into());
     }
 
     // 6. LOAD_NODE_MODULES(X, dirname(Y))
@@ -534,7 +534,7 @@ fn load_package_self(ctx: &Ctx<'_>, x: &str, dir: &str, is_esm: bool) -> Result<
     // 1. Find the closest package scope SCOPE to DIR.
     let mut package_json_file: Vec<u8>;
     let package_json: BorrowedValue;
-    match find_the_closest_package_scope(dir) {
+    let package_json_path: Box<str> = match find_the_closest_package_scope(dir) {
         // 2. If no scope was found, return.
         None => {
             return Ok(None);
@@ -552,6 +552,7 @@ fn load_package_self(ctx: &Ctx<'_>, x: &str, dir: &str, is_esm: bool) -> Result<
                     return Ok(None);
                 }
             }
+            path
         },
     };
     // 5. let MATCH = PACKAGE_EXPORTS_RESOLVE(pathToFileURL(SCOPE),
@@ -560,7 +561,9 @@ fn load_package_self(ctx: &Ctx<'_>, x: &str, dir: &str, is_esm: bool) -> Result<
     // 6. RESOLVE_ESM_MATCH(MATCH)
     if let Ok((path, _)) = package_exports_resolve(&package_json, &name, is_esm) {
         trace!("|  load_package_self(2.c): {}", path);
-        return Ok(Some(path.into()));
+        let dir = package_json_path.trim_end_matches("package.json");
+        let module_path = correct_extensions([dir, path].concat());
+        return Ok(Some(module_path.into()));
     }
 
     Ok(None)

tests/unit/require.test.ts

@@ -143,6 +143,10 @@ it("require `uuid` module element", () => {
   _require(`${CWD}/fixtures/test_modules/test-uuid.js`);
 });
 
+it("require `react-dom` module element", () => {
+  _require(`${CWD}/fixtures/test_modules/test-react-dom.js`);
+});
+
 //create a test that spawns a subprocess and executes require.mjs from fixtures and captures stdout
 it("should handle blocking requires", (done) => {
   const proc = spawn(process.argv0, [`${CWD}/fixtures/require.mjs`]);