The check that blocks filesystem resolution of imports from data URL modules lives in the private resolve_id() fallback, which only runs after all plugin resolveId hooks. Plugins already get a chance to resolve such imports; if none does, rolldown throws UNRESOLVED_IMPORT.

Changes

• New test plugin_can_resolve_import_from_data_url_module: explicitly verifies a plugin can successfully intercept and resolve an import originating from a data URL module

// Plugin resolves './helper' when importer is a data URL module
if args.specifier == "./helper"
  && args.importer.is_some_and(|id| id.starts_with("\0rolldown/data-url:"))
{
  return Ok(Some(HookResolveIdOutput { id: VIRTUAL_HELPER.into(), ..Default::default() }));
}

Complements the existing loader_data_url_text_java_script_cannot_import fixture that covers the error path when no plugin resolves the import.

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