infer bigint data type

Author: Tobin Brown

src/sequelize/data-type/data-type-service.ts

@@ -18,6 +18,8 @@ export function inferDataType(designType: any): DataTypeAbstract | undefined {
   switch (designType) {
     case String:
       return DataTypes.STRING;
+    case BigInt:
+      return DataTypes.BIGINT;
     case Number:
       return DataTypes.INTEGER;
     case Boolean:

test/specs/data-type-service.spec.ts

@@ -0,0 +1,27 @@
+import {expect} from 'chai';
+import {DataTypes} from 'sequelize';
+import { AutoIncrement, Column, Model, PrimaryKey, Table } from '../../src';
+import {createSequelize} from "../utils/sequelize";
+import {getAttributes} from '../../src/model/column/attribute-service';
+
+describe('data type service', () => {
+  describe('inferDataTypes',  () => {
+    it('correctly infers bigint data type', () => {
+
+      @Table
+      class BigIntModel extends Model {
+        @PrimaryKey
+        @AutoIncrement
+        @Column
+        id: bigint;
+      }
+
+      const sequelize = createSequelize();
+      sequelize.addModels([BigIntModel]);
+
+      const attributes = getAttributes(BigIntModel.prototype);
+
+      expect(attributes.id.type).to.equal(DataTypes.BIGINT);
+    });
+  });
+});