Jest 遇到了一个意外的令牌 nestjs

Question

我在使用玩笑运行在 nest.js 中进行端到端测试时遇到问题。我一直收到错误

Jest encountered an unexpected token

任何时候我尝试运行我的 e2e 测试。所有其他测试套件运行成功但未成功。我在网上一一梳理，无果。

这是我在 package.json

中的笑话配置

"jest": {
    "preset": "ts-jest",
    "moduleFileExtensions": [
      "js",
      "json",
      "ts"
    ],
    "rootDir": "src",
    "testRegex": "(?<!.e2e).spec.ts$",
    "transform": {
      "^.+\.(t|j)s$": "ts-jest"
    },
    "coverageDirectory": "../coverage",
    "testEnvironment": "node"
  }

下面是我的tsconfig.json文件

{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowSyntheticDefaultImports": true,
    "target": "es2019",
    "sourceMap": true,
    "outDir": "./dist",
    "baseUrl": "./",
    "incremental": true,
    "esModuleInterop": true,
    "lib": ["es2019"]
  }
}

我用的是 ts-jest 而不是 babel

我运行我在 package.json

中用这个脚本进行了端到端测试

"test:e2e": "jest --config ./test/jest-e2e.json", 以下是我的 jest-e2e.json 文件

中的配置

{
  "moduleFileExtensions": ["js", "json", "ts"],
  "rootDir": "../",
  "testEnvironment": "node",
  "testRegex": ".e2e.spec.ts$",
  "transform": {
    "^.+\.(t|j)s$": "ts-jest"
  }
}

最后，下面是控制台中的实际错误：

Test suite failed to run

    Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

    By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

    Details:

    /Users/michaelowolabi/Desktop/YoungM/sz/sz-graphql-api/node_modules/graphql-moment/lib/factory.coffee:1
    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){{GraphQLScalarType} = require 'graphql'
                                                                                                                 ^

    SyntaxError: Unexpected token '='

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1350:14)
      at Object.<anonymous> (node_modules/graphql-moment/index.js:2:17)

Answer 1

看起来 graphql-moment 代码未使用 commonJS、UMD 或其他一些兼容格式发布，Jest 无法解析它。您最有可能需要做的是像这样在您的测试中模拟它：

jest.mock('graphql-moment', () => ({
  GraphQLDate: jest.fn(),
  ...etcOtherFunctionsFromTheLib
}));

或者告诉 Jest 在 Jest 运行时用你的 Jest 配置转译依赖代码：

  transformIgnorePatterns: [
    '<rootDir>/node_modules/(?!graphql-moment)',
  ],

如果您要测试 date/time 是否符合您的预期，则第二种解决方案可能更好。

你可以在这里看到代码实际上并没有被转译。也许向他们提出问题：

https://github.com/jiexi/graphql-moment/blob/master/index.js

Jest 遇到了一个意外的令牌 nestjs

Jest encountered an unexpected token nestjs

typescript

jestjs

nestjs

ts-jest