GITBOOK-191: change request with no subject merged in GitBook

docs/gitbook/bullmq-pro/groups/sandboxes-for-groups.md

@@ -3,6 +3,8 @@
 It is also possible to use [Sandboxes](../../guide/workers/sandboxed-processors.md) for processing groups.  It works essentially the same as in standard BullMQ, but you gain access to the "gid" property in the job object sent to your processor, for example:
 
 ```typescript
+import { SandboxedJobPro } from '@taskforcesh/bullmq-pro';
+
 module.exports = function (job: SandboxedJobPro) {
   expect(job).to.have.property('gid');
   expect(job.opts).to.have.property('group');