问题描述
我正在处理客户遗留代码，它是用于 Jasmine 测试的 node.js 项目。
我的问题是，当我运行测试时，被调用的函数（在不同的文件中）无法找到/查看使用 require
示例：
file1.js
const file2 = require('./file2');
fdescribe('Login',file2.login);
file2.js
const Api = require('./api');
module.exports = {
login() {
let user;
beforeAll(async () => {
user = await Api.createuser({
first_name: 'login test',password: 'XXXX',},Api.USER_ROLE.ADMIN);
// more code within function...
});
// other functions
}
通过 IDE (VSCode)，所有路径都是完整的，可以使用“转到定义”来跟踪。同样作为测试，我将登录函数的内容放入 file1.js 中的 describe 块，更新依赖项，一切正常。但是我的老板和客户想保持目前的结构。
当我按照此处所示运行时，我收到以下警告：
(node:6021) Warning: Accessing non-existent property 'createuser' of module exports inside circular dependency
(node:6021) Warning: Accessing non-existent property 'USER_ROLE' of module exports inside circular dependency
代码运行，但 createuser 和 USER_ROLE 出现“无法读取未定义属性”错误。
我知道警告提到了循环依赖，但据我所知没有，即只有 1->2->Api-> 等。
当从 file1.js 调用 file2.js 中的函数时，似乎没有发生 file2.js 中的 require。
我比较初级/没有经验，没有更多高级支持，因此我在这里伸出援手，解决一个可能相当简单的问题。
项目正在运行 node version 14.17.0
Api.js 文件更像是一个库文件，它“链接”到在这种情况下包含 createuser 和 USER_ROLE 的其他文件。
[因为这是遗留的客户端代码并且它在过去的某个时候工作过，我认为它可能与 Jasmine 或 Node JS 版本有关？]
节点警告/错误的更多详细信息：
(node:1693) Warning: Accessing non-existent property 'createuser' of module exports inside circular dependency
at emitCircularRequireWarning (internal/modules/cjs/loader.js:675:11)
at Object.get (internal/modules/cjs/loader.js:689:5)
at UserContext.<anonymous> (/home/runner/work/platform-validation/platform-validation/utils/dupes.js:45:24)
at QueueRunner.attempt (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7756:40)
at QueueRunner.run (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7798:25)
SYS.20: Login
✗ User can login
- TypeError: Cannot read property 'login' of undefined
at runNext (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7715:18)
at next (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7722:11)
at QueueRunner.onComplete (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7615:9)
at Immediate.<anonymous> (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7814:12)
at processImmediate (internal/timers.js:464:21)
(node:1693) Warning: Accessing non-existent property 'USER_ROLE' of module exports inside circular dependency
at emitCircularRequireWarning (internal/modules/cjs/loader.js:675:11)
at Object.get (internal/modules/cjs/loader.js:689:5)
at UserContext.<anonymous> (/home/runner/work/platform-validation/platform-validation/utils/dupes.js:49:11)
at QueueRunner.attempt (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7756:40)
at QueueRunner.run (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7798:25)
at runNext (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7715:18)
at next (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7722:11)
at QueueRunner.onComplete (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7615:9)
at Immediate.<anonymous> (/home/runner/work/platform-validation/platform-validation/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:7814:12)
at processImmediate (internal/timers.js:464:21)
解决方法
解决方案是添加：delete require.cache[require.resolve('./api')]
在 const Api = require('./api');
中的 file2.js 之前
这与 Node 缓存 require() 调用而不是按预期重新调用有关。
更多解释见链接：