Fix scoped modules

src/Resolver.js

@@ -130,7 +130,7 @@ class Resolver {
       return {path: builtins[filename]};
     }
 
-    let parts = filename.split(path.sep);
+    let parts = this.getModuleParts(filename);
     let root = path.parse(dir).root;
 
     while (dir !== root) {
@@ -298,7 +298,7 @@ class Resolver {
       alias = aliases[filename];
       if (alias == null) {
         // If it didn't match, try only the module name.
-        let parts = filename.split(path.sep);
+        let parts = this.getModuleParts(filename);
         alias = aliases[parts[0]];
         if (typeof alias === 'string') {
           // Append the filename back onto the aliased module.
@@ -346,6 +346,16 @@ class Resolver {
     let pkg = await this.findPackage(dir);
     return this.resolveAliases(filename, pkg);
   }
+
+  getModuleParts(name) {
+    let parts = path.normalize(name).split(path.sep);
+    if (parts[0].charAt(0) === '@') {
+      // Scoped module (e.g. @scope/module). Merge the first two parts back together.
+      parts.splice(0, 2, `${parts[0]}/${parts[1]}`);
+    }
+
+    return parts;
+  }
 }
 
 module.exports = Resolver;

test/resolver.js

@@ -198,6 +198,30 @@ describe('resolver', function() {
       );
       assert.equal(resolved.pkg.name, 'foo');
     });
+
+    it('should resolve a scoped module', async function() {
+      let resolved = await resolver.resolve(
+        '@scope/pkg',
+        path.join(rootDir, 'foo.js')
+      );
+      assert.equal(
+        resolved.path,
+        path.resolve(rootDir, 'node_modules/@scope/pkg/index.js')
+      );
+      assert.equal(resolved.pkg.name, 'scope-pkg');
+    });
+
+    it('should resolve a file inside a scoped module', async function() {
+      let resolved = await resolver.resolve(
+        '@scope/pkg/foo/bar',
+        path.join(rootDir, 'foo.js')
+      );
+      assert.equal(
+        resolved.path,
+        path.resolve(rootDir, 'node_modules/@scope/pkg/foo/bar.js')
+      );
+      assert.equal(resolved.pkg.name, 'scope-pkg');
+    });
   });
 
   describe('aliases', function() {