Jest、TypeScript 和 ts-jest：语法错误：无法在模块外部使用 import 语句

Question

我正在使用 Jest 和 SuperTest 测试 Apollo 服务器。服务器是用 TypeScript 编写的，所以我使用ts-jest. 我需要将 SuperTest 绑定到特定端口。SuperTest 文档说

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您可以将 http.Server 或函数传递给 request() - 如果服务器尚未侦听连接，则它会为您绑定到临时端口，因此无需跟踪端口。

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所以我想传递我的应用程序。我已经设置了索引文件来导出 Apollo 服务器

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// index.ts\nimport { ApolloServer } from \'apollo-server\';\n...\nconst start = () => {\n    ...\n    const server = new ApolloServer(config);\n    server.listen().then(({ url }) => {\n        log.info(`interface server  Running at ${url}`);\n    });\n    return server;\n};\n\nconst app = start();\n\nexport default app;\n

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但是当我运行我的代码时

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// __test__/index.ts\nimport { default as request } from \'supertest\';\nimport log from \'../util/log\';\nimport app from \'../index\';\n\nlet postData = {\n    query: `query allArticles {\n                allArticles {\n                    id\n                }\n            }`,\n    operationName: \'allArticles\'\n};\n\ntest(\'basic\', async () => {\n    try {\n        const response = await request(app)\n            .post(\'/graphql\')\n            .send(postData)\n            .expect(200); // status code that you expect to be returned\n        log.info(\'response\', response.statusCode);\n    } catch (error) {\n        log.info(`error ${error.toString()}`);\n    }\n});\n

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我明白了

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 FAIL  __test__/index.test.ts\n  \xe2\x97\x8f Test suite failed to run\n\n    Details:\n\n    /Users/abc/Documents/projects/yaa-interface-new/index.js:1\n    import { ApolloServer } from "apollo-server";\n    ^^^^^^\n\n    SyntaxError: Cannot use import statement outside a module\n\n      1 | import { default as request } from \'supertest\';\n      2 | import log from \'../util/log\';\n    > 3 | import app from \'../index\';\n        | ^\n

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由于某种原因，笑话正在寻找/index.js而不是index.ts？（js文件应该全部进入/dist- 见tsconfig下文）。根据这个 Stack Overflow 问题，我需要将 Babel 添加到 Jest 中。我尝试过设置 ts-jest 和 Jest 来使用 Babel，但我承认我不清楚我在做什么。无论如何，我都会遇到同样的错误。任何线索非常感谢！

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我的jest.config.js：

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 // jest.config.js\nmodule.exports = {\n    preset: \'ts-jest/presets/js-with-babel\',\n    testEnvironment: \'node\',\n    globals: {\n        \'ts-jest\': {\n            babelConfig: true\n        }\n    }\n};\n

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和我的tsconfig.json：

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 // tsconfig.json\n{\n  "compilerOptions": {\n    "target": "ES6",\n    "lib": [\n      "esnext",\n      "dom"\n    ],\n    "skipLibCheck": true,\n    "outDir": "dist",\n    "strict": false,\n    "forceConsistentCasingInFileNames": true,\n    "esModuleInterop": true,\n    "module": "commonjs",\n    "moduleResolution": "node",\n    "resolveJsonModule": true,\n    "isolatedModules": true,\n    "sourceMap": true,\n    "alwaysStrict": true\n  },\n  "exclude": [\n    "node_modules",\n    "**/*.test.ts",\n    "**/*.mock.ts"\n  ]\n}\n

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