feat(types): enabled string association (#10481)

test/integration/include.test.js

@@ -913,6 +913,22 @@ describe(Support.getTestDialectTeaser('Include'), () => {
       });
     });
 
+    it('should support eager loading associations using the name of the relation (string)', function() {
+      return this.Team.findOne({
+        where: {
+          name: 'TeamA'
+        },
+        include: [
+          {
+            association: 'members',
+            required: true
+          }
+        ]
+      }).then(team => {
+        expect(team.members).to.have.length(2);
+      });
+    });
+
     it('should not ripple grandchild required to top level find when required of child is not given (implicitly false)', function() {
       return this.Team.findAll({
         include: [

types/lib/model.d.ts

@@ -319,7 +319,7 @@ export interface IncludeOptions extends Filterable, Projectable {
   /**
    * The association you want to eagerly load. (This can be used instead of providing a model/as pair)
    */
-  association?: Association;
+  association?: Association | string;
 
   /**
    * Custom `on` clause, overrides default.