Use the canonical name for JS modules in node_modules

Closes #438

PiperOrigin-RevId: 239207994
diff --git a/internal/tsc_wrapped/compiler_host.ts b/internal/tsc_wrapped/compiler_host.ts
index 911b82e..e0b2d03 100644
--- a/internal/tsc_wrapped/compiler_host.ts
+++ b/internal/tsc_wrapped/compiler_host.ts
@@ -340,6 +340,10 @@
       }
     }
 
+    if (fileName.startsWith('node_modules/')) {
+      return fileName.substring('node_modules/'.length);
+    }
+
     // path/to/file ->
     // myWorkspace/path/to/file
     return path.posix.join(workspace, fileName);