无法在Node.js中导出变量

使用摩卡尝试从testHook文件中导出变量,但在测试文件中未定义,我的代码是::

测试文件:

 var xyz = require("testHook").xyz;

 class test1 {
 execute() {
  describe("test suite 1", async () => {
    it("test 1", async () => {
      console.log(xyz);
    });
    });
  }
}
new test1().execute();

testHook.js

 function abc()
 {
 //do some stuff and assume value to be returned is 10 
 exports.xyz = 10;;
 }
 beforeEach(() => {
  abc();
  console.log(this.xyz);
 });

输出::

 test suite 1
 10
 undefined
 ✓ test 1: 1ms
 Suite duration: 0.009 s, Tests: 1
 1 passing (10ms)
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