Is of type

In case when objects of different shape can be present inside array isOfType function should be specified in their meta info. This function should determine is meta can be used to check corresponding object.

enum EActionType {
   DELETE,
   UPDATE,
   ADD,
}

class User {
   public id: number;
   public name: string;
   public age: number;
}

const USER_META = new ObjectMeta({
   builder: User,
   fields: {
      id: new NumberField(),
      name: new StringField(),
      age: new NumberField(),
   }
});

class Update {
   public type: EActionType.UPDATE = EActionType.UPDATE;
   public data: User;
}

const UPDATE_META = new ObjectMeta({
   builder: Update,
   isOfType: ({ type }) => type === EActionType.UPDATE,
   fields: {
      type: new NumberField(),
      data: new ObjectField({
         meta: USER_META,
         isPartial: true,
      })
   }
});

class Add {
   public type: EActionType.ADD = EActionType.ADD;
   public data: User;
}

const ADD_META = new ObjectMeta({
   builder: Add,
   isOfType: ({ type }) => type === EActionType.ADD,
   fields: {
      type: new NumberField(),
      data: new ObjectField({ meta: USER_META })
   }
});

class Delete {
   public type: EActionType.DELETE = EActionType.DELETE;
   public id: number;
}

const DELETE_META = new ObjectMeta({
   builder: Delete,
   isOfType: ({ type }) => type === EActionType.DELETE,
   fields: {
      type: new NumberField(),
      id: new NumberField(),
   }
});

const ACTIONS_META = new ArrayMeta([
   new ObjectField({ meta: UPDATE_META }),
   new ObjectField({ meta: ADD_META }),
   new ObjectField({ meta: DELETE_META }),
] as [
      ObjectField<Update | Add | Delete>,
      ObjectField<Update | Add | Delete>,
      ObjectField<Update | Add | Delete>,
   ]);

const values = [
   {
      type: EActionType.DELETE,
      id: 1,
   },
   {
      type: EActionType.UPDATE,
      data: {
         name: `Masha`
      },
   },
   {
      type: EActionType.ADD,
      data: {
         id: 4,
         name: `Evdokia`,
         age: 23
      },
   },
   {
      type: EActionType.UPDATE,
      data: {
         id: 3,
         name: `Vitala`
      },
   },
   {
      type: EActionType.ADD,
      data: {
         id: 2,
         name: `Inragim`,
         age: 45
      },
   },
   {
      type: EActionType.DELETE,
      id: 1,
   },

];

const result = JTC.convert({
   id: `Patial User Data`,
   meta: ACTIONS_META,
   values,
});

const actions = result.converted.all;

console.log(actions);