fix undefined type

[crazyair]

No description provided.

[crazyair]

之前加 isEmptyValue 是因为如果 value 是 undefined，则 typeof value 为字符串 undefined 导致程序报错(不支持字符串 undefined)。

但是加上 isEmptyValue 后发现会将 [] 也识别为 empty，导致如果 transform 返回值是 []，rule 没有 type，最后导致校验的 message 为 v is not a string 而不是 v is required，这样就与单独写 rule=[{ required:true }] 的 message 不一致

[crazyair]

本测试用例用意为与没有设置 transform 的 mesasge 一致

  it('empty array message is "v is required"', done => {
    const value = { v: [] };
    new Schema({
      v: { required: true },
    }).validate(value, errors => {
      expect(errors).toBeTruthy();
      expect(errors[0].message).toBe('v is required');
      done();
    });
  });

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.33%. Comparing base (17ad411) to head (4411bca).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
- Coverage   82.36%   82.33%   -0.03%     
==========================================
  Files          25       25              
  Lines         652      651       -1     
  Branches      236      232       -4     
==========================================
- Hits          537      536       -1     
  Misses        114      114              
  Partials        1        1              

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[crazyair]

当 value 为 []，type 应该设置为 array，master 是没有设置