fix(types): specified this for getters and setters in fields

types/lib/model.d.ts

@@ -1260,7 +1260,7 @@ export interface ModelAttributeColumnReferencesOptions {
 /**
  * Column options for the model schema attributes
  */
-export interface ModelAttributeColumnOptions extends ColumnOptions {
+export interface ModelAttributeColumnOptions<M extends Model = Model> extends ColumnOptions {
   /**
    * A string or a data type
    */
@@ -1341,23 +1341,23 @@ export interface ModelAttributeColumnOptions extends ColumnOptions {
    * Provide a custom getter for this column. Use `this.getDataValue(String)` to manipulate the underlying
    * values.
    */
-  get?(): unknown;
+  get?(this: M): unknown;
 
   /**
    * Provide a custom setter for this column. Use `this.setDataValue(String, Value)` to manipulate the
    * underlying values.
    */
-  set?(val: unknown): void;
+  set?(this: M, val: unknown): void;
 }
 
 /**
  * Interface for Attributes provided for a column
  */
-export interface ModelAttributes {
+export interface ModelAttributes<M extends Model = Model> {
   /**
    * The description of a database column
    */
-  [name: string]: DataType | ModelAttributeColumnOptions;
+  [name: string]: DataType | ModelAttributeColumnOptions<M>;
 }
 
 /**
@@ -1607,7 +1607,7 @@ export abstract class Model<T = any, T2 = any> extends Hooks {
    *  string or a type-description object, with the properties described below:
    * @param options These options are merged with the default define options provided to the Sequelize constructor
    */
-  public static init<M extends Model = Model>(this: ModelCtor<M>, attributes: ModelAttributes, options: InitOptions<M>): void;
+  public static init<M extends Model = Model>(this: ModelCtor<M>, attributes: ModelAttributes<M>, options: InitOptions<M>): void;
 
   /**
    * Remove attribute from model definition

types/test/model.ts

@@ -48,7 +48,17 @@ MyModel.bulkCreate([{ int: 10 }], { include: OtherModel });
 
 const sequelize = new Sequelize('mysql://user:user@localhost:3306/mydb');
 
-MyModel.init({}, {
+MyModel.init({
+  virtual: {
+    type: new DataTypes.VIRTUAL(DataTypes.BOOLEAN, ['num']),
+    get() {
+      return this.getDataValue('num') + 2;
+    },
+    set(value: number) {
+      this.setDataValue('num', value - 2);
+    }
+  }
+}, {
   indexes: [
     {
       fields: ['foo'],
@@ -90,4 +100,4 @@ UserModel.findCreateFind({
  * Test for primaryKeyAttributes.
  */
 class TestModel extends Model {};
-TestModel.primaryKeyAttributes;
+TestModel.primaryKeyAttributes;