basic-functionality.spec.ts

import 'reflect-metadata';
import {
  instanceToInstance,
  classToClassFromExist,
  instanceToPlain,
  classToPlainFromExist,
  plainToInstance,
  plainToClassFromExist,
} from '../../src/index';
import { defaultMetadataStorage } from '../../src/storage';
import { Exclude, Expose, Type, Transform } from '../../src/decorators';

describe('basic functionality', () => {
  it('should convert instance of the given object to plain javascript object and should expose all properties since its a default behaviour', () => {
    defaultMetadataStorage.clear();

    class User {
      id: number;
      firstName: string;
      lastName: string;
      password: string;
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    };

    const fromExistUser = new User();
    fromExistUser.id = 1;

    const plainUser = instanceToPlain(user);
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    });

    const existUser = { id: 1, age: 27 };
    const plainUser2 = classToPlainFromExist(user, existUser);
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      id: 1,
      age: 27,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    });
    expect(plainUser2).toEqual(existUser);

    const transformedUser = plainToInstance(User, fromPlainUser);
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    });

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser);
    expect(fromExistTransformedUser).toBeInstanceOf(User);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    });

    const classToClassUser = instanceToInstance(user);
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser).toEqual(user);
    expect(classToClassUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    });

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser);
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    });
  });

  it('should exclude extraneous values if the excludeExtraneousValues option is set to true', () => {
    defaultMetadataStorage.clear();

    class User {
      @Expose() id: number;
      @Expose() firstName: string;
      @Expose() lastName: string;
    }

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      age: 12,
    };

    const transformedUser = plainToInstance(User, fromPlainUser);
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser).toHaveProperty('age');
    expect(transformedUser.id).toBeUndefined();

    const transformedUserWithoutExtra = plainToInstance(User, fromPlainUser, { excludeExtraneousValues: true });
    expect(transformedUserWithoutExtra).toBeInstanceOf(User);
    expect(transformedUserWithoutExtra).not.toHaveProperty('age');
  });

  it('should exclude extraneous values if both excludeExtraneousValues and ignoreDecorators option is set to true', () => {
    // fixes https://github.com/typestack/class-transformer/issues/533
    defaultMetadataStorage.clear();

    class ExampleClass {
      @Exclude()
      public valueOne!: number;

      @Expose()
      public valueTwo!: number;
    }

    const transformationOptions = {
      ignoreDecorators: true,
      excludeExtraneousValues: true,
    };

    const instance = plainToInstance(
      ExampleClass,
      { valueOne: 42, valueTwo: 42, extra: true, _otherExtra: true },
      transformationOptions
    );

    expect(instance).toBeInstanceOf(ExampleClass);
    expect(instance).toEqual({ valueOne: 42, valueTwo: 42 });

    (instance as any).extraProp = 'not-needed';

    expect(instanceToPlain(instance, transformationOptions)).toEqual({
      valueOne: 42,
      valueTwo: 42,
    });
  });

  it('should exclude all objects marked with @Exclude() decorator', () => {
    defaultMetadataStorage.clear();

    class User {
      id: number;
      firstName: string;
      lastName: string;
      @Exclude()
      password: string;
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    };

    const fromExistUser = new User();
    fromExistUser.id = 1;

    const plainUser: any = instanceToPlain(user);
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });
    expect(plainUser.password).toBeUndefined();

    const existUser = { id: 1, age: 27, password: 'yayayaya' };
    const plainUser2 = classToPlainFromExist(user, existUser);
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      id: 1,
      age: 27,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'yayayaya',
    });
    expect(plainUser2).toEqual(existUser);

    const transformedUser = plainToInstance(User, fromPlainUser);
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser);
    expect(fromExistTransformedUser).toBeInstanceOf(User);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const classToClassUser = instanceToInstance(user);
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser).not.toEqual(user);
    expect(classToClassUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser);
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });
  });

  it('should exclude all properties from object if whole class is marked with @Exclude() decorator', () => {
    defaultMetadataStorage.clear();

    @Exclude()
    class User {
      id: number;
      firstName: string;
      lastName: string;
      password: string;
    }

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    };

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';

    const fromExistUser = new User();
    fromExistUser.id = 1;

    const plainUser: any = instanceToPlain(user);
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({});
    expect(plainUser.firstName).toBeUndefined();
    expect(plainUser.lastName).toBeUndefined();
    expect(plainUser.password).toBeUndefined();

    const existUser = { id: 1, age: 27 };
    const plainUser2 = classToPlainFromExist(user, existUser);
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      id: 1,
      age: 27,
    });
    expect(plainUser2).toEqual(existUser);

    const transformedUser = plainToInstance(User, fromPlainUser);
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser).toEqual({});

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser);
    expect(fromExistTransformedUser).toBeInstanceOf(User);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
    });

    const classToClassUser = instanceToInstance(user);
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser).not.toEqual(user);
    expect(classToClassUser).toEqual({});

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser);
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
    });
  });

  it('should exclude all properties from object if whole class is marked with @Exclude() decorator, but include properties marked with @Expose() decorator', () => {
    defaultMetadataStorage.clear();

    @Exclude()
    class User {
      id: number;

      @Expose()
      firstName: string;

      @Expose()
      lastName: string;

      password: string;
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    };

    const fromExistUser = new User();
    fromExistUser.id = 1;

    const plainUser: any = instanceToPlain(user);
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });
    expect(plainUser.password).toBeUndefined();

    const existUser = { id: 1, age: 27 };
    const plainUser2 = classToPlainFromExist(user, existUser);
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      id: 1,
      age: 27,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });
    expect(plainUser2).toEqual(existUser);

    const transformedUser = plainToInstance(User, fromPlainUser);
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser);
    expect(fromExistTransformedUser).toBeInstanceOf(User);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const classToClassUser = instanceToInstance(user);
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser).not.toEqual(user);
    expect(classToClassUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser);
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });
  });

  it('should exclude all properties from object if its defined via transformation options, but include properties marked with @Expose() decorator', () => {
    defaultMetadataStorage.clear();

    class User {
      id: number;

      @Expose()
      firstName: string;

      @Expose()
      lastName: string;

      password: string;
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    };

    const fromExistUser = new User();
    fromExistUser.id = 1;

    const plainUser: any = instanceToPlain(user, { strategy: 'excludeAll' });
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });
    expect(plainUser.password).toBeUndefined();

    const existUser = { id: 1, age: 27 };
    const plainUser2 = classToPlainFromExist(user, existUser, { strategy: 'excludeAll' });
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      id: 1,
      age: 27,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });
    expect(plainUser2).toEqual(existUser);

    const transformedUser = plainToInstance(User, fromPlainUser, { strategy: 'excludeAll' });
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser, { strategy: 'excludeAll' });
    expect(fromExistTransformedUser).toBeInstanceOf(User);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const classToClassUser = instanceToInstance(user, { strategy: 'excludeAll' });
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser).not.toEqual(user);
    expect(classToClassUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser, { strategy: 'excludeAll' });
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
    });
  });

  it('should expose all properties from object if its defined via transformation options, but exclude properties marked with @Exclude() decorator', () => {
    defaultMetadataStorage.clear();

    class User {
      id: number;
      firstName: string;

      @Exclude()
      lastName: string;

      @Exclude()
      password: string;
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    };

    const fromExistUser = new User();
    fromExistUser.id = 1;

    const plainUser: any = instanceToPlain(user, { strategy: 'exposeAll' });
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      firstName: 'Umed',
    });
    expect(plainUser.lastName).toBeUndefined();
    expect(plainUser.password).toBeUndefined();

    const existUser = { id: 1, age: 27 };
    const plainUser2 = classToPlainFromExist(user, existUser, { strategy: 'exposeAll' });
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      id: 1,
      age: 27,
      firstName: 'Umed',
    });
    expect(plainUser2).toEqual(existUser);

    const transformedUser = plainToInstance(User, fromPlainUser, { strategy: 'exposeAll' });
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser).toEqual({
      firstName: 'Umed',
    });

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser, { strategy: 'exposeAll' });
    expect(fromExistTransformedUser).toBeInstanceOf(User);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
      firstName: 'Umed',
    });

    const classToClassUser = instanceToInstance(user, { strategy: 'exposeAll' });
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser).not.toEqual(user);
    expect(classToClassUser).toEqual({
      firstName: 'Umed',
    });

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser, { strategy: 'exposeAll' });
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
      firstName: 'Umed',
    });
  });

  it('should convert values to specific types if they are set via @Type decorator', () => {
    defaultMetadataStorage.clear();

    class User {
      id: number;

      @Type(type => String)
      firstName: string;

      @Type(type => String)
      lastName: string;

      @Type(type => Number)
      password: number;

      @Type(type => Boolean)
      isActive: boolean;

      @Type(type => Date)
      registrationDate: Date;

      @Type(type => String)
      lastVisitDate: string;

      @Type(type => Buffer)
      uuidBuffer: Buffer;

      @Type(type => String)
      nullableString?: null | string;

      @Type(type => Number)
      nullableNumber?: null | number;

      @Type(type => Boolean)
      nullableBoolean?: null | boolean;

      @Type(type => Date)
      nullableDate?: null | Date;

      @Type(type => Buffer)
      nullableBuffer?: null | Buffer;
    }

    const date = new Date();
    const user = new User();
    const uuid = Buffer.from('1234');
    user.firstName = 321 as any;
    user.lastName = 123 as any;
    user.password = '123' as any;
    user.isActive = '1' as any;
    user.registrationDate = date.toString() as any;
    user.lastVisitDate = date as any;
    user.uuidBuffer = uuid as any;
    user.nullableString = null as any;
    user.nullableNumber = null as any;
    user.nullableBoolean = null as any;
    user.nullableDate = null as any;
    user.nullableBuffer = null as any;

    const fromPlainUser = {
      firstName: 321,
      lastName: 123,
      password: '123',
      isActive: '1',
      registrationDate: date.toString(),
      lastVisitDate: date,
      uuidBuffer: uuid,
      nullableString: null as null | string,
      nullableNumber: null as null | string,
      nullableBoolean: null as null | string,
      nullableDate: null as null | string,
      nullableBuffer: null as null | string,
    };

    const fromExistUser = new User();
    fromExistUser.id = 1;

    const plainUser: any = instanceToPlain(user, { strategy: 'exposeAll' });
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      firstName: '321',
      lastName: '123',
      password: 123,
      isActive: true,
      registrationDate: new Date(date.toString()),
      lastVisitDate: date.toString(),
      uuidBuffer: uuid,
      nullableString: null,
      nullableNumber: null,
      nullableBoolean: false,
      nullableDate: null,
      nullableBuffer: null,
    });

    const existUser = { id: 1, age: 27 };
    const plainUser2 = classToPlainFromExist(user, existUser, { strategy: 'exposeAll' });
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      id: 1,
      age: 27,
      firstName: '321',
      lastName: '123',
      password: 123,
      isActive: true,
      registrationDate: new Date(date.toString()),
      lastVisitDate: date.toString(),
      uuidBuffer: uuid,
      nullableString: null,
      nullableNumber: null,
      nullableBoolean: false,
      nullableDate: null,
      nullableBuffer: null,
    });
    expect(plainUser2).toEqual(existUser);

    const transformedUser = plainToInstance(User, fromPlainUser, { strategy: 'exposeAll' });
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser).toEqual({
      firstName: '321',
      lastName: '123',
      password: 123,
      isActive: true,
      registrationDate: new Date(date.toString()),
      lastVisitDate: date.toString(),
      uuidBuffer: uuid,
      nullableString: null,
      nullableNumber: null,
      nullableBoolean: false,
      nullableDate: null,
      nullableBuffer: null,
    });

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser, { strategy: 'exposeAll' });
    expect(fromExistTransformedUser).toBeInstanceOf(User);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
      firstName: '321',
      lastName: '123',
      password: 123,
      isActive: true,
      registrationDate: new Date(date.toString()),
      lastVisitDate: date.toString(),
      uuidBuffer: uuid,
      nullableString: null,
      nullableNumber: null,
      nullableBoolean: false,
      nullableDate: null,
      nullableBuffer: null,
    });

    const classToClassUser = instanceToInstance(user, { strategy: 'exposeAll' });
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser).not.toEqual(user);
    expect(classToClassUser).toEqual({
      firstName: '321',
      lastName: '123',
      password: 123,
      isActive: true,
      registrationDate: new Date(date.toString()),
      lastVisitDate: date.toString(),
      uuidBuffer: uuid,
      nullableString: null,
      nullableNumber: null,
      nullableBoolean: false,
      nullableDate: null,
      nullableBuffer: null,
    });

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser, { strategy: 'exposeAll' });
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
      firstName: '321',
      lastName: '123',
      password: 123,
      isActive: true,
      registrationDate: new Date(date.toString()),
      lastVisitDate: date.toString(),
      uuidBuffer: uuid,
      nullableString: null,
      nullableNumber: null,
      nullableBoolean: false,
      nullableDate: null,
      nullableBuffer: null,
    });
  });

  it('should transform nested objects too and make sure their decorators are used too', () => {
    defaultMetadataStorage.clear();

    class Photo {
      id: number;
      name: string;

      @Exclude()
      filename: string;

      uploadDate: Date;
    }

    class User {
      firstName: string;
      lastName: string;

      @Exclude()
      password: string;

      photo: Photo; // type should be automatically guessed
    }

    const photo = new Photo();
    photo.id = 1;
    photo.name = 'Me';
    photo.filename = 'iam.jpg';
    photo.uploadDate = new Date();

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';
    user.photo = photo;

    const plainUser: any = instanceToPlain(user, { strategy: 'exposeAll' });
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser.photo).not.toBeInstanceOf(Photo);
    expect(plainUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        name: 'Me',
        uploadDate: photo.uploadDate,
      },
    });
    expect(plainUser.password).toBeUndefined();
    expect(plainUser.photo.filename).toBeUndefined();
    expect(plainUser.photo.uploadDate).toEqual(photo.uploadDate);
    expect(plainUser.photo.uploadDate).not.toBe(photo.uploadDate);

    const existUser = { id: 1, age: 27, photo: { id: 2, description: 'photo' } };
    const plainUser2: any = classToPlainFromExist(user, existUser, { strategy: 'exposeAll' });
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2.photo).not.toBeInstanceOf(Photo);
    expect(plainUser2).toEqual({
      id: 1,
      age: 27,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        name: 'Me',
        uploadDate: photo.uploadDate,
        description: 'photo',
      },
    });
    expect(plainUser2).toEqual(existUser);
    expect(plainUser2.password).toBeUndefined();
    expect(plainUser2.photo.filename).toBeUndefined();
    expect(plainUser2.photo.uploadDate).toEqual(photo.uploadDate);
    expect(plainUser2.photo.uploadDate).not.toBe(photo.uploadDate);
  });

  it('should transform nested objects too and make sure given type is used instead of automatically guessed one', () => {
    defaultMetadataStorage.clear();

    class Photo {
      id: number;
      name: string;

      @Exclude()
      filename: string;
    }

    class ExtendedPhoto implements Photo {
      id: number;

      @Exclude()
      name: string;

      filename: string;
    }

    class User {
      id: number;
      firstName: string;
      lastName: string;

      @Exclude()
      password: string;

      @Type(type => ExtendedPhoto) // force specific type
      photo: Photo;
    }

    const photo = new Photo();
    photo.id = 1;
    photo.name = 'Me';
    photo.filename = 'iam.jpg';

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';
    user.photo = photo;

    const plainUser: any = instanceToPlain(user);
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        filename: 'iam.jpg',
      },
    });
    expect(plainUser.password).toBeUndefined();
    expect(plainUser.photo.name).toBeUndefined();
  });

  it('should convert given plain object to class instance object', () => {
    defaultMetadataStorage.clear();

    class Photo {
      id: number;
      name: string;

      @Exclude()
      filename: string;

      metadata: string;
      uploadDate: Date;
    }

    class User {
      id: number;
      firstName: string;
      lastName: string;

      @Exclude()
      password: string;

      @Type(type => Photo)
      photo: Photo;
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';
    user.photo = new Photo();
    user.photo.id = 1;
    user.photo.name = 'Me';
    user.photo.filename = 'iam.jpg';
    user.photo.uploadDate = new Date();

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      photo: {
        id: 1,
        name: 'Me',
        filename: 'iam.jpg',
        uploadDate: new Date(),
      },
    };

    const fromExistUser = new User();
    fromExistUser.id = 1;
    const fromExistPhoto = new Photo();
    fromExistPhoto.metadata = 'taken by Camera';
    fromExistUser.photo = fromExistPhoto;

    const transformedUser = plainToInstance(User, fromPlainUser);
    expect(transformedUser).toBeInstanceOf(User);
    expect(transformedUser.photo).toBeInstanceOf(Photo);
    expect(transformedUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        name: 'Me',
        uploadDate: fromPlainUser.photo.uploadDate,
      },
    });

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser);
    expect(fromExistTransformedUser).toEqual(fromExistUser);
    expect(fromExistTransformedUser.photo).toEqual(fromExistPhoto);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        name: 'Me',
        metadata: 'taken by Camera',
        uploadDate: fromPlainUser.photo.uploadDate,
      },
    });

    const classToClassUser = instanceToInstance(user);
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser.photo).toBeInstanceOf(Photo);
    expect(classToClassUser).not.toEqual(user);
    expect(classToClassUser).not.toEqual(user.photo);
    expect(classToClassUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        name: 'Me',
        uploadDate: user.photo.uploadDate,
      },
    });

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser);
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser.photo).toBeInstanceOf(Photo);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).not.toEqual(user.photo);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        name: 'Me',
        metadata: 'taken by Camera',
        uploadDate: user.photo.uploadDate,
      },
    });
  });

  it('should expose only properties that match given group', () => {
    defaultMetadataStorage.clear();

    class Photo {
      id: number;

      @Expose({
        groups: ['user', 'guest'],
      })
      filename: string;

      @Expose({
        groups: ['admin'],
      })
      status: number;

      metadata: string;
    }

    class User {
      id: number;
      firstName: string;

      @Expose({
        groups: ['user', 'guest'],
      })
      lastName: string;

      @Expose({
        groups: ['user'],
      })
      password: string;

      @Expose({
        groups: ['admin'],
      })
      isActive: boolean;

      @Type(type => Photo)
      photo: Photo;

      @Expose({
        groups: ['admin'],
      })
      @Type(type => Photo)
      photos: Photo[];
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';
    user.isActive = false;
    user.photo = new Photo();
    user.photo.id = 1;
    user.photo.filename = 'myphoto.jpg';
    user.photo.status = 1;
    user.photos = [user.photo];

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      isActive: false,
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
        status: 1,
      },
      photos: [
        {
          id: 1,
          filename: 'myphoto.jpg',
          status: 1,
        },
      ],
    };

    const fromExistUser = new User();
    fromExistUser.id = 1;
    fromExistUser.photo = new Photo();
    fromExistUser.photo.metadata = 'taken by Camera';

    const plainUser1: any = instanceToPlain(user);
    expect(plainUser1).not.toBeInstanceOf(User);
    expect(plainUser1).toEqual({
      firstName: 'Umed',
      photo: {
        id: 1,
      },
    });
    expect(plainUser1.lastName).toBeUndefined();
    expect(plainUser1.password).toBeUndefined();
    expect(plainUser1.isActive).toBeUndefined();

    const plainUser2: any = instanceToPlain(user, { groups: ['user'] });
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
      },
    });
    expect(plainUser2.isActive).toBeUndefined();

    const transformedUser2 = plainToInstance(User, fromPlainUser, { groups: ['user'] });
    expect(transformedUser2).toBeInstanceOf(User);
    expect(transformedUser2.photo).toBeInstanceOf(Photo);
    expect(transformedUser2).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
      },
    });

    const fromExistTransformedUser = plainToClassFromExist(fromExistUser, fromPlainUser, { groups: ['user'] });
    expect(fromExistTransformedUser).toEqual(fromExistUser);
    expect(fromExistTransformedUser.photo).toEqual(fromExistUser.photo);
    expect(fromExistTransformedUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      photo: {
        id: 1,
        metadata: 'taken by Camera',
        filename: 'myphoto.jpg',
      },
    });

    const classToClassUser = instanceToInstance(user, { groups: ['user'] });
    expect(classToClassUser).toBeInstanceOf(User);
    expect(classToClassUser.photo).toBeInstanceOf(Photo);
    expect(classToClassUser).not.toEqual(user);
    expect(classToClassUser).not.toEqual(user.photo);
    expect(classToClassUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
      },
    });

    const classToClassFromExistUser = classToClassFromExist(user, fromExistUser, { groups: ['user'] });
    expect(classToClassFromExistUser).toBeInstanceOf(User);
    expect(classToClassFromExistUser.photo).toBeInstanceOf(Photo);
    expect(classToClassFromExistUser).not.toEqual(user);
    expect(classToClassFromExistUser).not.toEqual(user.photo);
    expect(classToClassFromExistUser).toEqual(fromExistUser);
    expect(classToClassFromExistUser).toEqual({
      id: 1,
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      photo: {
        id: 1,
        metadata: 'taken by Camera',
        filename: 'myphoto.jpg',
      },
    });

    const plainUser3: any = instanceToPlain(user, { groups: ['guest'] });
    expect(plainUser3).not.toBeInstanceOf(User);
    expect(plainUser3).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
      },
    });
    expect(plainUser3.password).toBeUndefined();
    expect(plainUser3.isActive).toBeUndefined();

    const transformedUser3 = plainToInstance(User, fromPlainUser, { groups: ['guest'] });
    expect(transformedUser3).toBeInstanceOf(User);
    expect(transformedUser3.photo).toBeInstanceOf(Photo);
    expect(transformedUser3).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
      },
    });

    const plainUser4: any = instanceToPlain(user, { groups: ['admin'] });
    expect(plainUser4).not.toBeInstanceOf(User);
    expect(plainUser4).toEqual({
      firstName: 'Umed',
      isActive: false,
      photo: {
        id: 1,
        status: 1,
      },
      photos: [
        {
          id: 1,
          status: 1,
        },
      ],
    });
    expect(plainUser4.lastName).toBeUndefined();
    expect(plainUser4.password).toBeUndefined();

    const transformedUser4 = plainToInstance(User, fromPlainUser, { groups: ['admin'] });
    expect(transformedUser4).toBeInstanceOf(User);
    expect(transformedUser4.photo).toBeInstanceOf(Photo);
    expect(transformedUser4.photos[0]).toBeInstanceOf(Photo);
    expect(transformedUser4).toEqual({
      firstName: 'Umed',
      isActive: false,
      photo: {
        id: 1,
        status: 1,
      },
      photos: [
        {
          id: 1,
          status: 1,
        },
      ],
    });

    const plainUser5: any = instanceToPlain(user, { groups: ['admin', 'user'] });
    expect(plainUser5).not.toBeInstanceOf(User);
    expect(plainUser5).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      isActive: false,
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
        status: 1,
      },
      photos: [
        {
          id: 1,
          filename: 'myphoto.jpg',
          status: 1,
        },
      ],
    });

    const transformedUser5 = plainToInstance(User, fromPlainUser, { groups: ['admin', 'user'] });
    expect(transformedUser5).toBeInstanceOf(User);
    expect(transformedUser5).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      isActive: false,
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
        status: 1,
      },
      photos: [
        {
          id: 1,
          filename: 'myphoto.jpg',
          status: 1,
        },
      ],
    });
  });

  it('should expose only properties that match given version', () => {
    defaultMetadataStorage.clear();

    class Photo {
      id: number;

      @Expose({
        since: 1.5,
        until: 2,
      })
      filename: string;

      @Expose({
        since: 2,
      })
      status: number;
    }

    class User {
      @Expose({
        since: 1,
        until: 2,
      })
      firstName: string;

      @Expose({
        since: 0.5,
      })
      lastName: string;

      @Exclude()
      password: string;

      @Type(type => Photo)
      photo: Photo;

      @Expose({
        since: 3,
      })
      @Type(type => Photo)
      photos: Photo[];
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';
    user.photo = new Photo();
    user.photo.id = 1;
    user.photo.filename = 'myphoto.jpg';
    user.photo.status = 1;
    user.photos = [user.photo];

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
        status: 1,
      },
      photos: [
        {
          id: 1,
          filename: 'myphoto.jpg',
          status: 1,
        },
      ],
    };

    const plainUser1: any = instanceToPlain(user);
    expect(plainUser1).not.toBeInstanceOf(User);
    expect(plainUser1).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
        status: 1,
      },
      photos: [
        {
          id: 1,
          filename: 'myphoto.jpg',
          status: 1,
        },
      ],
    });

    const transformedUser1 = plainToInstance(User, fromPlainUser);
    expect(transformedUser1).toBeInstanceOf(User);
    expect(transformedUser1.photo).toBeInstanceOf(Photo);
    expect(transformedUser1.photos[0]).toBeInstanceOf(Photo);
    expect(transformedUser1).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
        status: 1,
      },
      photos: [
        {
          id: 1,
          filename: 'myphoto.jpg',
          status: 1,
        },
      ],
    });

    const plainUser2: any = instanceToPlain(user, { version: 0.3 });
    expect(plainUser2).not.toBeInstanceOf(User);
    expect(plainUser2).toEqual({
      photo: {
        id: 1,
      },
    });

    const transformedUser2 = plainToInstance(User, fromPlainUser, { version: 0.3 });
    expect(transformedUser2).toBeInstanceOf(User);
    expect(transformedUser2.photo).toBeInstanceOf(Photo);
    expect(transformedUser2).toEqual({
      photo: {
        id: 1,
      },
    });

    const plainUser3: any = instanceToPlain(user, { version: 0.5 });
    expect(plainUser3).not.toBeInstanceOf(User);
    expect(plainUser3).toEqual({
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
      },
    });

    const transformedUser3 = plainToInstance(User, fromPlainUser, { version: 0.5 });
    expect(transformedUser3).toBeInstanceOf(User);
    expect(transformedUser3.photo).toBeInstanceOf(Photo);
    expect(transformedUser3).toEqual({
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
      },
    });

    const plainUser4: any = instanceToPlain(user, { version: 1 });
    expect(plainUser4).not.toBeInstanceOf(User);
    expect(plainUser4).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
      },
    });

    const transformedUser4 = plainToInstance(User, fromPlainUser, { version: 1 });
    expect(transformedUser4).toBeInstanceOf(User);
    expect(transformedUser4.photo).toBeInstanceOf(Photo);
    expect(transformedUser4).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
      },
    });

    const plainUser5: any = instanceToPlain(user, { version: 1.5 });
    expect(plainUser5).not.toBeInstanceOf(User);
    expect(plainUser5).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
      },
    });

    const transformedUser5 = plainToInstance(User, fromPlainUser, { version: 1.5 });
    expect(transformedUser5).toBeInstanceOf(User);
    expect(transformedUser5.photo).toBeInstanceOf(Photo);
    expect(transformedUser5).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        filename: 'myphoto.jpg',
      },
    });

    const plainUser6: any = instanceToPlain(user, { version: 2 });
    expect(plainUser6).not.toBeInstanceOf(User);
    expect(plainUser6).toEqual({
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        status: 1,
      },
    });

    const transformedUser6 = plainToInstance(User, fromPlainUser, { version: 2 });
    expect(transformedUser6).toBeInstanceOf(User);
    expect(transformedUser6.photo).toBeInstanceOf(Photo);
    expect(transformedUser6).toEqual({
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        status: 1,
      },
    });

    const plainUser7: any = instanceToPlain(user, { version: 3 });
    expect(plainUser7).not.toBeInstanceOf(User);
    expect(plainUser7).toEqual({
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        status: 1,
      },
      photos: [
        {
          id: 1,
          status: 1,
        },
      ],
    });

    const transformedUser7 = plainToInstance(User, fromPlainUser, { version: 3 });
    expect(transformedUser7).toBeInstanceOf(User);
    expect(transformedUser7.photo).toBeInstanceOf(Photo);
    expect(transformedUser7.photos[0]).toBeInstanceOf(Photo);
    expect(transformedUser7).toEqual({
      lastName: 'Khudoiberdiev',
      photo: {
        id: 1,
        status: 1,
      },
      photos: [
        {
          id: 1,
          status: 1,
        },
      ],
    });
  });

  it('should expose method and accessors that have @Expose()', () => {
    defaultMetadataStorage.clear();

    class User {
      firstName: string;
      lastName: string;

      @Exclude()
      password: string;

      @Expose()
      get name(): string {
        return this.firstName + ' ' + this.lastName;
      }

      @Expose()
      getName(): string {
        return this.firstName + ' ' + this.lastName;
      }
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';

    const fromPlainUser = {
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      password: 'imnosuperman',
    };

    const plainUser: any = instanceToPlain(user);
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      firstName: 'Umed',
      lastName: 'Khudoiberdiev',
      name: 'Umed Khudoiberdiev',
      getName: 'Umed Khudoiberdiev',
    });

    const transformedUser = plainToInstance(User, fromPlainUser);
    expect(transformedUser).toBeInstanceOf(User);
    const likeUser = new User();
    likeUser.firstName = 'Umed';
    likeUser.lastName = 'Khudoiberdiev';
    expect(transformedUser).toEqual(likeUser);
  });

  it('should expose with alternative name if its given', () => {
    defaultMetadataStorage.clear();

    class User {
      @Expose({ name: 'myName' })
      firstName: string;

      @Expose({ name: 'secondName' })
      lastName: string;

      @Exclude()
      password: string;

      @Expose()
      get name(): string {
        return this.firstName + ' ' + this.lastName;
      }

      @Expose({ name: 'fullName' })
      getName(): string {
        return this.firstName + ' ' + this.lastName;
      }
    }

    const user = new User();
    user.firstName = 'Umed';
    user.lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';

    const fromPlainUser = {
      myName: 'Umed',
      secondName: 'Khudoiberdiev',
      password: 'imnosuperman',
    };

    const plainUser: any = instanceToPlain(user);
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      myName: 'Umed',
      secondName: 'Khudoiberdiev',
      name: 'Umed Khudoiberdiev',
      fullName: 'Umed Khudoiberdiev',
    });

    const transformedUser = plainToInstance(User, fromPlainUser);
    expect(transformedUser).toBeInstanceOf(User);
    const likeUser = new User();
    likeUser.firstName = 'Umed';
    likeUser.lastName = 'Khudoiberdiev';
    expect(transformedUser).toEqual(likeUser);
  });

  it('should exclude all prefixed properties if prefix is given', () => {
    defaultMetadataStorage.clear();

    class Photo {
      id: number;
      $filename: string;
      status: number;
    }

    class User {
      $system: string;
      _firstName: string;
      _lastName: string;

      @Exclude()
      password: string;

      @Type(() => Photo)
      photo: Photo;

      @Expose()
      get name(): string {
        return this._firstName + ' ' + this._lastName;
      }
    }

    const user = new User();
    user.$system = '@#$%^&*token(*&^%$#@!';
    user._firstName = 'Umed';
    user._lastName = 'Khudoiberdiev';
    user.password = 'imnosuperman';
    user.photo = new Photo();
    user.photo.id = 1;
    user.photo.$filename = 'myphoto.jpg';
    user.photo.status = 1;

    const fromPlainUser = {
      $system: '@#$%^&*token(*&^%$#@!',
      _firstName: 'Khudoiberdiev',
      _lastName: 'imnosuperman',
      password: 'imnosuperman',
      photo: {
        id: 1,
        $filename: 'myphoto.jpg',
        status: 1,
      },
    };

    const plainUser: any = instanceToPlain(user, { excludePrefixes: ['_', '$'] });
    expect(plainUser).not.toBeInstanceOf(User);
    expect(plainUser).toEqual({
      name: 'Umed Khudoiberdiev',
      photo: {
        id: 1,
        status: 1,
      },
    });

    const transformedUser = plainToInstance(User, fromPlainUser, { excludePrefixes: ['_', '$'] });
    expect(transformedUser).toBeInstanceOf(User);
    const likeUser = new User();
    likeUser.photo = new Photo();
    likeUser.photo.id = 1;
    likeUser.photo.status = 1;
    expect(transformedUser).toEqual(likeUser);
  });

  it('should transform array', () => {
    defaultMetadataStorage.clear();

    class User {
      id: number;
      firstName: string;
      lastName: string;

      @Exclude()
      password: string;

      @Expose()
      get name(): string {
        return this.firstName + ' ' + this.lastName;
      }
    }

    const user1 = new User();
    user1.firstName = 'Umed';
    user1.lastName = 'Khudoiberdiev';
    user1.password = 'imnosuperman';

    const user2 = new User();
    user2.firstName = 'Dima';
    user2.lastName = 'Zotov';
    user2.password = 'imnomesser';

    const users = [user1, user2];

    const plainUsers: any = instanceToPlain(users);
    expect(plainUsers).toEqual([
      {
        firstName: 'Umed',
        lastName: 'Khudoiberdiev',
        name: 'Umed Khudoiberdiev',
      },
      {
        firstName: 'Dima',
        lastName: 'Zotov',
        name: 'Dima Zotov',
      },
    ]);

    const fromPlainUsers = [
      {
        firstName: 'Umed',
        lastName: 'Khudoiberdiev',
        name: 'Umed Khudoiberdiev',
      },
      {
        firstName: 'Dima',
        lastName: 'Zotov',
        name: 'Dima Zotov',
      },
    ];

    const existUsers = [
      { id: 1, age: 27 },
      { id: 2, age: 30 },
    ];
    const plainUser2 = classToPlainFromExist(users, existUsers);
    expect(plainUser2).toEqual([
      {
        id: 1,
        age: 27,
        firstName: 'Umed',
        lastName: 'Khudoiberdiev',
        name: 'Umed Khudoiberdiev',
      },
      {
        id: 2,
        age: 30,
        firstName: 'Dima',
        lastName: 'Zotov',
        name: 'Dima Zotov',
      },
    ]);

    const transformedUser = plainToInstance(User, fromPlainUsers);

    expect(transformedUser[0]).toBeInstanceOf(User);
    expect(transformedUser[1]).toBeInstanceOf(User);
    const likeUser1 = new User();
    likeUser1.firstName = 'Umed';
    likeUser1.lastName = 'Khudoiberdiev';

    const likeUser2 = new User();
    likeUser2.firstName = 'Dima';
    likeUser2.lastName = 'Zotov';
    expect(transformedUser).toEqual([likeUser1, likeUser2]);

    const classToClassUsers = instanceToInstance(users);
    expect(classToClassUsers[0]).toBeInstanceOf(User);
    expect(classToClassUsers[1]).toBeInstanceOf(User);
    expect(classToClassUsers[0]).not.toEqual(user1);
    expect(classToClassUsers[1]).not.toEqual(user1);

    const classUserLike1 = new User();
    classUserLike1.firstName = 'Umed';
    classUserLike1.lastName = 'Khudoiberdiev';

    const classUserLike2 = new User();
    classUserLike2.firstName = 'Dima';
    classUserLike2.lastName = 'Zotov';

    expect(classToClassUsers).toEqual([classUserLike1, classUserLike2]);

    const fromExistUser1 = new User();
    fromExistUser1.id = 1;

    const fromExistUser2 = new User();
    fromExistUser2.id = 2;

    const fromExistUsers = [fromExistUser1, fromExistUser2];

    const classToClassFromExistUser = classToClassFromExist(users, fromExistUsers);
    expect(classToClassFromExistUser[0]).toBeInstanceOf(User);
    expect(classToClassFromExistUser[1]).toBeInstanceOf(User);
    expect(classToClassFromExistUser[0]).not.toEqual(user1);
    expect(classToClassFromExistUser[1]).not.toEqual(user1);
    expect(classToClassFromExistUser).toEqual(fromExistUsers);

    const fromExistUserLike1 = new User();
    fromExistUserLike1.id = 1;
    fromExistUserLike1.firstName = 'Umed';
    fromExistUserLike1.lastName = 'Khudoiberdiev';

    const fromExistUserLike2 = new User();
    fromExistUserLike2.id = 2;
    fromExistUserLike2.firstName = 'Dima';
    fromExistUserLike2.lastName = 'Zotov';

    expect(classToClassFromExistUser).toEqual([fromExistUserLike1, fromExistUserLike2]);
  });

  it('should transform objects with null prototype', () => {
    class TestClass {
      prop: string;
    }

    const obj = Object.create(null);
    obj.a = 'JS FTW';

    const transformedClass = plainToInstance(TestClass, obj);
    expect(transformedClass).toBeInstanceOf(TestClass);
  });

  it('should not pollute the prototype with a `__proto__` property', () => {
    const object = JSON.parse('{"__proto__": { "admin": true }}');
    const plainObject = {};
    classToPlainFromExist(object, plainObject);
    expect((plainObject as any).admin).toEqual(undefined);
  });

  it('should not pollute the prototype with a `constructor.prototype` property', () => {
    const object = JSON.parse('{"constructor": { "prototype": { "admin": true }}}');
    const plainObject = {};
    classToPlainFromExist(object, plainObject);
    expect((plainObject as any).admin).toEqual(undefined);
  });

  it('should default union types where the plain type is an array to an array result', () => {
    class User {
      name: string;
    }

    class TestClass {
      @Type(() => User)
      usersDefined: User[] | undefined;

      @Type(() => User)
      usersUndefined: User[] | undefined;
    }

    const obj = Object.create(null);
    obj.usersDefined = [{ name: 'a-name' }];
    obj.usersUndefined = undefined;

    const transformedClass = plainToInstance(TestClass, obj as Record<string, any>);

    expect(transformedClass).toBeInstanceOf(TestClass);

    expect(transformedClass.usersDefined).toBeInstanceOf(Array);
    expect(transformedClass.usersDefined.length).toEqual(1);
    expect(transformedClass.usersDefined[0]).toBeInstanceOf(User);
    expect(transformedClass.usersDefined[0].name).toEqual('a-name');

    expect(transformedClass.usersUndefined).toBeUndefined();
  });
});