The following two tests do not pass. They were run in src/matched-data.spec.ts.

describe('when option includeOptionals is false', () => {
  it('returns object without optional data', done => {
    const req = {
      headers: { foo: 'bla', bar: '123' },
    };

    const middleware = check(['foo', 'bar', 'baz'])
      .optional()
      .trim()
      .isString();

    middleware(req, {}, () => {
      const data = matchedData(req, { includeOptionals: false });
      expect(data).toHaveProperty('bar', '123');
      expect(data.baz).toBeUndefined();

      done();
    });
  });
});

describe('when option includeOptionals is not set', () => {
  it('returns object without optional data', done => {
    const req = {
      headers: { foo: 'bla', bar: '123' },
    };

    const middleware = check(['foo', 'bar', 'baz'])
      .optional()
      .trim()
      .isString();

    middleware(req, {}, () => {
      const data = matchedData(req);
      expect(data).toHaveProperty('bar', '123');
      expect(data.baz).toBeUndefined();

      done();
    });
  });
});

Uh oh!

6.0.1 problem when use optional #729

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