add server to monorepo.

packages/server/src/services/CreditNotes/DeleteCustomerLinkedCreditNote.ts

@@ -0,0 +1,30 @@
+import { Inject, Service } from 'typedi';
+import { ServiceError } from '@/exceptions';
+import TenancyService from '@/services/Tenancy/TenancyService';
+import { ERRORS } from './constants';
+
+@Service()
+export default class DeleteCustomerLinkedCreidtNote {
+  @Inject()
+  tenancy: TenancyService;
+
+  /**
+   * Validate the given customer has no linked credit note transactions.
+   * @param {number} tenantId
+   * @param {number} creditNoteId
+   */
+  public validateCustomerHasNoCreditTransaction = async (
+    tenantId: number,
+    customerId: number
+  ) => {
+    const { CreditNote } = this.tenancy.models(tenantId);
+
+    const associatedCredits = await CreditNote.query().where(
+      'customerId',
+      customerId
+    );
+    if (associatedCredits.length > 0) {
+      throw new ServiceError(ERRORS.CUSTOMER_HAS_LINKED_CREDIT_NOTES);
+    }
+  };
+}