fix(typings): add OptimisticLockError type (#10777)

types/lib/errors.d.ts

@@ -130,6 +130,13 @@ export class ExclusionConstraintError extends DatabaseError {
 }
 
 /**
+ * Thrown when attempting to update a stale model instance
+ */
+export class OptimisticLockError extends BaseError {
+  constructor(options: { message?: string, modelName?: string, values?: { [key: string]: any }, where?: { [key: string]: any } });
+}
+
+/**
  * A base class for all connection related errors.
  */
 export class ConnectionError extends BaseError {

types/test/errors.ts

 // Error === BaseError
 import { BaseError, EmptyResultError, Error, UniqueConstraintError } from 'sequelize';
 import { User } from './models/User';
+import { OptimisticLockError } from '../lib/errors';
 
 async function test() {
     try {
@@ -23,4 +24,16 @@ async function test() {
             console.error('should return emptyresulterror');
         }
     }
+
+    try {
+        const user: User | null = await User.findByPk(1);
+        if (user != null) {
+            user.username = 'foo';
+            user.save();
+        }
+    } catch (e) {
+        if (!(e instanceof OptimisticLockError)) {
+            console.log('should return OptimisticLockError');
+        }
+    }
 }