fix(types): return a usable type when using the sequelize.models lookup (#11293)

types/lib/sequelize.d.ts

@@ -19,6 +19,7 @@ import {
   UpdateOptions,
   UpdateOptions,
   WhereAttributeHash,
   WhereAttributeHash,
   WhereOperators,
   WhereOperators,
+  ModelCtor,
 } from './model';
 } from './model';
 import { ModelManager } from './model-manager';
 import { ModelManager } from './model-manager';
 import * as Op from './operators';
 import * as Op from './operators';
@@ -767,7 +768,7 @@ export class Sequelize extends Hooks {
    * Dictionary of all models linked with this instance.
    * Dictionary of all models linked with this instance.
    */
    */
   public readonly models: {
   public readonly models: {
-    [key: string]: typeof Model;
+    [key: string]: ModelCtor<Model>;
   };
   };
 
 
   /**
   /**
@@ -1109,7 +1110,7 @@ export class Sequelize extends Hooks {
    *
    *
    * @param modelName The name of a model defined with Sequelize.define
    * @param modelName The name of a model defined with Sequelize.define
    */
    */
-  public model(modelName: string): typeof Model;
+  public model(modelName: string): ModelCtor<Model>;
 
 
   /**
   /**
    * Checks whether a model with the given name is defined
    * Checks whether a model with the given name is defined

types/test/sequelize.ts

@@ -49,4 +49,8 @@ Sequelize.afterConnect(() => {
 
 
 const rnd: Fn = sequelize.random();
 const rnd: Fn = sequelize.random();
 
 
-const myModel: typeof Model = sequelize.models.asd;
+class Model1 extends Model{}
+class Model2 extends Model{}
+const myModel: typeof Model1 = sequelize.models.asd;
+myModel.hasOne(Model2)
+myModel.findAll();
\ No newline at end of file