fix(types): add missing findCreateFind type (#11068)

types/lib/model.d.ts

@@ -1925,6 +1925,15 @@ export abstract class Model<T = any, T2 = any> extends Hooks {
   ): Promise<[M, boolean]>;
 
   /**
+   * A more performant findOrCreate that will not work under a transaction (at least not in postgres) 
+   * Will execute a find call, if empty then attempt to create, if unique constraint then attempt to find again
+   */
+  public static findCreateFind<M extends Model>(
+    this: { new (): M } & typeof Model,
+    options: FindOrCreateOptions
+  ): Promise<[M, boolean]>;
+
+  /**
    * Insert or update a single row. An update will be executed if a row which matches the supplied values on
    * either the primary key or a unique key is found. Note that the unique index must be defined in your
    * sequelize model and not just in the table. Otherwise you may experience a unique constraint violation,

types/test/model.ts

-import { Association, HasOne, Model, Sequelize } from 'sequelize';
+import { Association, HasOne, Model, Sequelize, DataTypes } from 'sequelize';
 
 class MyModel extends Model {
   public num!: number;
@@ -36,3 +36,25 @@ MyModel.init({}, {
   sequelize,
   tableName: 'my_model'
 });
+
+/**
+ * Tests for findCreateFind() type. 
+ */
+class UserModel extends Model {}
+
+UserModel.init({
+  username: { type: DataTypes.STRING, allowNull: false },
+  beta_user: { type: DataTypes.BOOLEAN, allowNull: false }
+}, {
+  sequelize: sequelize
+})
+
+UserModel.findCreateFind({
+  where: {
+    username: "new user username"
+  }, 
+  defaults: {
+    beta_user: true 
+  }
+})
+