Javascript 要求导出测试文件中的默认模块

我试图在我的测试文件中需要一个模块，但当我将其导出为默认模块时，却不知道如何做到这一点。我有以下代码：

server.ts

import { MyClass } from './myClass';

/* Other code here */

const server = app.listen(port, () => {
    console.log('Started');
});

export default server;

describe('Express Server', () => {
    let server: any;

    beforeEach(() => {
        delete require.cache[require.resolve('./server.ts')];
        server = require('./server.ts');
    });

    afterEach((done: any) => {
        server.close(done);
    });

    it('sample test', (done: any) => {
        done();
    });
});

describe('Express Server', () => {
    let server: any;

    beforeEach(() => {
        delete require.cache[require.resolve('./server.ts')];

        // Had to change this line to have ".default" at the end
        server = require('./server.ts').default;
    });

    afterEach((done: any) => {
        server.close(done);
    });

    it('sample test', (done: any) => {
        done();
    });
});

使用webpack，这个构建非常好。我导出服务器是因为我希望能够在规范文件中测试它。我尝试在我的测试文件中这样做（使用mocha）：

testFile.ts

import { MyClass } from './myClass';

/* Other code here */

const server = app.listen(port, () => {
    console.log('Started');
});

export default server;

describe('Express Server', () => {
    let server: any;

    beforeEach(() => {
        delete require.cache[require.resolve('./server.ts')];
        server = require('./server.ts');
    });

    afterEach((done: any) => {
        server.close(done);
    });

    it('sample test', (done: any) => {
        done();
    });
});

describe('Express Server', () => {
    let server: any;

    beforeEach(() => {
        delete require.cache[require.resolve('./server.ts')];

        // Had to change this line to have ".default" at the end
        server = require('./server.ts').default;
    });

    afterEach((done: any) => {
        server.close(done);
    });

    it('sample test', (done: any) => {
        done();
    });
});

当然，上述内容并不是在测试任何东西。但这并不重要，因为它在beforeach:

SyntaxError:Unexpected token{

---

如何要求服务器模块？我需要能够在每次测试之前重置要求。

您的测试环境似乎不支持TypeScript文件

尝试使用

ts节点运行mocha命令

mocha -r ts-node/register src/**/test.ts

来源：
因此，我不得不更改
tsconfig.json
中定义的模块。我将其从“es2015”更改为“commonjs”，问题中发布的错误消失了。此外，我还必须更改检索服务器的方式，如下所示（在要求之后添加了
.default
）

tsconfig.json

{
    "compilerOptions": {
        "baseUrl": "./",
        "outDir": "./dist",
        "target": "es5",
        "module": "commonjs", // Had to change the value for this
        "sourceMap": true
    },
    "include": [
        "./src/**/*"
    ],
    "exclude": [
        "./dist",
        "./node_modules"
    ]
}

testFile.ts

import { MyClass } from './myClass';

/* Other code here */

const server = app.listen(port, () => {
    console.log('Started');
});

export default server;

describe('Express Server', () => {
    let server: any;

    beforeEach(() => {
        delete require.cache[require.resolve('./server.ts')];
        server = require('./server.ts');
    });

    afterEach((done: any) => {
        server.close(done);
    });

    it('sample test', (done: any) => {
        done();
    });
});

describe('Express Server', () => {
    let server: any;

    beforeEach(() => {
        delete require.cache[require.resolve('./server.ts')];

        // Had to change this line to have ".default" at the end
        server = require('./server.ts').default;
    });

    afterEach((done: any) => {
        server.close(done);
    });

    it('sample test', (done: any) => {
        done();
    });
});

我还没有完全了解“es2015”和“commonjs”之间的区别，因此如果有人知道，请分享。通过上述更改，我能够运行以下命令：

nyc ts-mocha -p tsconfig.json --reporter mocha-multi-reporters --reporter-options configFile=test/config/mocha-config.json test/**/*.test.ts --exit

它拉入了服务器，我的所有测试都顺利通过。感谢您提到测试环境可能没有正确读取typescript。
他们这样做了。我有其他用typescript编写的测试文件，它们工作正常。这是我运行的命令：
nyc ts mocha-p tsconfig.json--reporter mocha multi reporters--reporter options configFile=test/config/mocha-config.json test/***.test.ts--exit
我尝试添加
-r ts node/register
但我得到了相同的错误。如果不
删除require.cache[require.resolve（'./server.ts'）]
，会发生什么情况？是的，出现了相同的错误。感谢您的洞察力，我找到了解决方案（贴出答案）谢谢！