Jest: Jest 在 React 应用程序中遇到意外令牌

创建于 2018-08-31  ·  42评论  ·  资料来源: facebook/jest

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🐛 错误报告

在 React 应用程序中尝试使用 Jest 运行测试时,出现Jest encountered an unexpected token错误。 我复制了Link组件并直接从这里测试。 这是错误:

FAIL  src/components/Link.test.js
  ● 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:
     • 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:

    SyntaxError: C:\workspace\react\testapp\src\components\Link.test.js: Unexpected token (8:4)

       6 | test('Link changes the class when hovered', () => {
       7 |   const component = renderer.create(
    >  8 |     <Link page="http://www.facebook.com">Facebook</Link>,
         |     ^
       9 |   );
      10 |   let tree = component.toJSON();
      11 |   expect(tree).toMatchSnapshot();

      at Parser.raise (node_modules/@babel/parser/lib/index.js:3938:15)
      at Parser.unexpected (node_modules/@babel/parser/lib/index.js:5247:16)
      at Parser.parseExprAtom (node_modules/@babel/parser/lib/index.js:6327:20)
      at Parser.parseExprSubscripts (node_modules/@babel/parser/lib/index.js:5923:21)
      at Parser.parseMaybeUnary (node_modules/@babel/parser/lib/index.js:5902:21)
      at Parser.parseExprOps (node_modules/@babel/parser/lib/index.js:5811:21)
      at Parser.parseMaybeConditional (node_modules/@babel/parser/lib/index.js:5783:21)
      at Parser.parseMaybeAssign (node_modules/@babel/parser/lib/index.js:5730:21)
      at Parser.parseExprListItem (node_modules/@babel/parser/lib/index.js:6994:18)
      at Parser.parseCallExpressionArguments (node_modules/@babel/parser/lib/index.js:6123:22)

这是我的package.json

{
  "name": "testapp",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "scripts": {
    "start": "webpack-dev-server --config ./config/webpack.config.development.js",
    "build": "webpack -p --config ./config/webpack.config.production.js",
    "test": "jest"
  },
  "dependencies": {
    "axios": "^0.18.0",
    "moment": "^2.22.2",
    "polished": "^2.0.3",
    "prop-types": "^15.6.2",
    "react": "^16.4.2",
    "react-delay-render": "^0.1.2",
    "react-dom": "^16.4.2",
    "react-imported-component": "^4.6.2",
    "react-router-dom": "^4.3.1",
    "simple-grid": "^1.0.1",
    "styled-components": "^3.4.5",
    "uuid": "^3.3.2",
    "validator": "^10.7.0"
  },
  "devDependencies": {
    "@babel/core": "^7.0.0",
    "@babel/plugin-proposal-class-properties": "^7.0.0",
    "@babel/plugin-syntax-dynamic-import": "^7.0.0",
    "@babel/preset-env": "^7.0.0",
    "@babel/preset-react": "^7.0.0",
    "babel-core": "7.0.0-bridge.0",
    "babel-jest": "^23.4.2",
    "babel-loader": "^8.0.0",
    "babel-plugin-styled-components": "^1.6.0",
    "css-loader": "^1.0.0",
    "html-webpack-plugin": "^3.2.0",
    "jest": "^23.5.0",
    "mini-css-extract-plugin": "^0.4.2",
    "react-test-renderer": "^16.4.2",
    "regenerator-runtime": "^0.12.1",
    "style-loader": "^0.23.0",
    "webpack": "^4.17.1",
    "webpack-cli": "^3.1.0",
    "webpack-dev-server": "^3.1.7"
  }
}

这是我的.babelrc文件(位于根目录中):

{
  "plugins": [
    "@babel/plugin-proposal-class-properties",
    "babel-plugin-styled-components",
    "@babel/plugin-syntax-dynamic-import"
  ],
  "presets": ["@babel/preset-env", "@babel/preset-react"],
  "env": {
    "development": {
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        ["babel-plugin-styled-components", { "displayName": true }],
        "@babel/plugin-syntax-dynamic-import"
      ],
      "presets": ["@babel/preset-env", "@babel/preset-react"]
    },
    "test": {
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        ["babel-plugin-styled-components", { "displayName": true }],
        "@babel/plugin-syntax-dynamic-import"
      ],
      "presets": ["@babel/preset-env", "@babel/preset-react"]
    },
    "production": {
      "plugins": [
        "@babel/plugin-proposal-class-properties",
        "babel-plugin-styled-components",
        "@babel/plugin-syntax-dynamic-import"
      ],
      "presets": ["@babel/preset-env", "@babel/preset-react"]
    }
  }
}

再现

重现行为的步骤:

  • 使用yarn add --dev babel-jest babel-core@^7.0.0-0 @babel/core安装 Jest
  • 创建测试
  • 运行yarn test

预期行为

  • 开玩笑应该有效

运行npx envinfo --preset jest

将结果粘贴到此处:

OS: Windows 10
    CPU: x64 Intel(R) Xeon(R) CPU E3-1505M v6 @ 3.00GHz
  Binaries:
    Yarn: 1.5.1 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 5.6.0 - C:\Program Files\nodejs\npm.CMD

最有用的评论

3天后,我才找到了这个问题的解决方案。
有两种解决方案:

解决方案1:

您可以将文件名从.babelrc更改babel.config.js ,这将起作用。

##解决方案2:
我正在使用这种方式。
创建一个这样的转换文件(我的是jest-transforme.js ):

const config = {
  babelrc: false,
  presets: [
    [
      "@babel/env",
      {
        modules: false
      }
    ],
    "@babel/react"
  ],
  plugins: [
    ["@babel/plugin-proposal-decorators", { legacy: true }],
    ["@babel/plugin-proposal-class-properties", { loose: true }],
    "transform-es2015-modules-commonjs"
  ]
};
module.exports = require("babel-jest").createTransformer(config);

这是我的jest.config.js

module.exports = {
  collectCoverageFrom: ["src/**/*.{js,jsx,mjs}"],
  testMatch: ["<rootDir>/src/**/__tests__/**/*.{js,jsx,mjs}", "<rootDir>/src/**/?(*.)(spec|test).{js,jsx,mjs}"],
  transform: {
    "^.+\\.(js|jsx|mjs)$": "<rootDir>/config/jest/jest-transformer.js"
  },
  transformIgnorePatterns: ["[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"]
};

我还有我的.babelrc
``
const 环境 = require("./env-config.js");

模块.出口 = {
预设:[
[
"下一个/巴别塔",
{
“预设环境”:{
使用BuiltIns:“条目”
}
}
]
],
插件: [
["styled-components", { ssr: true, displayName: true, preprocess: false }],
[
“模块解析器”,
{
根: [”。/”]
}
]
],
环境:{
开发:{
插件: [
[“转换定义”,环境],
[“模块解析器”,{根:[“./”]}],
“变换-装饰器-遗产”,
“转换类属性”
]
},
建造: {
插件: [
[“转换定义”,环境],
[“模块解析器”,{根:[“./”]}],
“变换-装饰器-遗产”,
“转换类属性”
]
},
生产: {
预设:[
[
"minify", // 为什么在这里添加 minify,我们在整个代码包上运行 uglify
{
mangle:假的,
评价:假
}
]
],
插件: [
[“转换定义”,环境],
["@babel/plugin-proposal-decorators", { legacy: true }],
[“@babel/plugin-proposal-class-properties”,{松散:真实}],
[“模块解析器”,{根:[“./”]}]
],
评论:假的,
紧凑:真实,
缩小:真实
}
}
};
````
希望这可以让你们通过这个问题。 欢呼。

所有42条评论

我也有同样的问题。

同样的问题在这里。

同样的问题在这里..稍微复杂一点,因为我正在使用 monorepo。

@fabioSalimbeni @hoaiduyit @mikedloss我已经使用 Babel 7 在 Lerna monorepo 中通过了我的 React 和 React Native 测试( Jestenzyme )。

如果您正在使用 monorepo,则需要使用带有babel.config.js的新 Babel 配置: https ://babeljs.io/docs/en/v7-migration

这是monorepo 根的babel.config.js

module.exports = {
    overrides: [
        {
            test: 'platforms/webApp1',
            extends: 'platforms/webApp1/babel.config.js'
        },
        {
            test: 'platforms/webApp2',
            extends: 'platforms/webApp2/babel.config.js'
        }
    ]
};

这就是我的babel.config.js对于webApp1一个 monorepo 应用程序的样子:

module.exports = {
    env: {
        test: {
            presets: [
                [
                    '@babel/preset-env',
                    {
                        modules: 'commonjs',
                        debug: false
                    }
                ],
                '@babel/preset-flow',
                '@babel/preset-react'
            ],
            plugins: [
                '@babel/plugin-syntax-dynamic-import',
                '@babel/plugin-proposal-class-properties'
            ]
        },
        production: {
            presets: [
                ['@babel/preset-env', { modules: false }],
                '@babel/preset-flow',
                '@babel/preset-react'
            ],
            plugins: [
                '@babel/plugin-syntax-dynamic-import',
                '@babel/plugin-proposal-class-properties'
            ]
        },
        development: {
            presets: [
                ['@babel/preset-env', { modules: false }],
                '@babel/preset-flow',
                '@babel/preset-react'
            ],
            plugins: [
                '@babel/plugin-syntax-dynamic-import',
                '@babel/plugin-proposal-class-properties'
            ]
        }
    }
};

这是 Jest 配置:

    "jest": {
        "verbose": true,
        "clearMocks": true,
        "collectCoverage": true,
        "setupTestFrameworkScriptFile": "<rootDir>/config/setupTest.js",
        "transform": {
            "^.+\\.js$": "babel-jest"
        },
        "moduleNameMapper": {
            "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",
            "\\.(css|scss)$": "<rootDir>/__mocks__/styleMock.js"
        }
    }

setupTest.js看起来像:

const Enzyme = require('enzyme');
const Adapter = require('enzyme-adapter-react-16');

Enzyme.configure({ adapter: new Adapter() });

fileMocks.js看起来像:

module.exports = 'i-am-a-stubbed-file';

styleMocks.js看起来像:

module.exports = {};

您还需要在每个应用程序的package.json中添加一些 Babel 插件和babel-core版本作为devDependencies

        ...
        "@babel/cli": "^7.0.0",
        "@babel/core": "^7.0.0",
        "@babel/plugin-proposal-class-properties": "^7.0.0",
        "@babel/plugin-syntax-dynamic-import": "^7.0.0",
        "@babel/preset-env": "^7.0.0",
        "@babel/preset-flow": "^7.0.0",
        "@babel/preset-react": "^7.0.0",
        "babel-core": "7.0.0-bridge.0",
        "babel-eslint": "^9.0.0",
        "babel-jest": "^23.4.2",
        "babel-loader": "^8.0.2",
        ...
        "jest": "^23.5.0",
        "jest-cli": "^23.5.0",
        ...

3天后,我才找到了这个问题的解决方案。
有两种解决方案:

解决方案1:

您可以将文件名从.babelrc更改babel.config.js ,这将起作用。

##解决方案2:
我正在使用这种方式。
创建一个这样的转换文件(我的是jest-transforme.js ):

const config = {
  babelrc: false,
  presets: [
    [
      "@babel/env",
      {
        modules: false
      }
    ],
    "@babel/react"
  ],
  plugins: [
    ["@babel/plugin-proposal-decorators", { legacy: true }],
    ["@babel/plugin-proposal-class-properties", { loose: true }],
    "transform-es2015-modules-commonjs"
  ]
};
module.exports = require("babel-jest").createTransformer(config);

这是我的jest.config.js

module.exports = {
  collectCoverageFrom: ["src/**/*.{js,jsx,mjs}"],
  testMatch: ["<rootDir>/src/**/__tests__/**/*.{js,jsx,mjs}", "<rootDir>/src/**/?(*.)(spec|test).{js,jsx,mjs}"],
  transform: {
    "^.+\\.(js|jsx|mjs)$": "<rootDir>/config/jest/jest-transformer.js"
  },
  transformIgnorePatterns: ["[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"]
};

我还有我的.babelrc
``
const 环境 = require("./env-config.js");

模块.出口 = {
预设:[
[
"下一个/巴别塔",
{
“预设环境”:{
使用BuiltIns:“条目”
}
}
]
],
插件: [
["styled-components", { ssr: true, displayName: true, preprocess: false }],
[
“模块解析器”,
{
根: [”。/”]
}
]
],
环境:{
开发:{
插件: [
[“转换定义”,环境],
[“模块解析器”,{根:[“./”]}],
“变换-装饰器-遗产”,
“转换类属性”
]
},
建造: {
插件: [
[“转换定义”,环境],
[“模块解析器”,{根:[“./”]}],
“变换-装饰器-遗产”,
“转换类属性”
]
},
生产: {
预设:[
[
"minify", // 为什么在这里添加 minify,我们在整个代码包上运行 uglify
{
mangle:假的,
评价:假
}
]
],
插件: [
[“转换定义”,环境],
["@babel/plugin-proposal-decorators", { legacy: true }],
[“@babel/plugin-proposal-class-properties”,{松散:真实}],
[“模块解析器”,{根:[“./”]}]
],
评论:假的,
紧凑:真实,
缩小:真实
}
}
};
````
希望这可以让你们通过这个问题。 欢呼。

@GeorgianSorinMaxim问题是我的玩笑应用程序忽略.babelrc文件,更改为babel.config.js将解决问题,但我还是解决了它,我的答案高于此评论。

感谢@GeorgianSorinMaxim @hoaiduyit最后我只是通过为 babel-jest 创建自定义转换器来解决它。 无需其他更改。

Babel 7 似乎需要babel.config.js才能正常工作,使用它而不是 babelrc

babel-jest仍然依赖于 Babel 6 中的babel-core ,如果你想使用Babel 7你可以使用
这个变压器babel7-jest

babel-jest在 babel 7 上工作得很好,不需要自定义转换器

@SimenB我将我的.babelrc重命名为babel.config.js但它仍然显示出带有意外令牌的错误。 不过它适用于 babel7-pre.42。 还有其他常见的遗漏吗? :) 谢谢。

@alexindigo看看这个如何写babel.config.js

https://babeljs.io/docs/en/configuration

是的,运行yarn upgrade --latest解决了这个问题:)

@alexindigo @hoaiduyit你们到底是怎么知道babel.config.js ? 解决同样的问题并找到您的解决方案,我在想自己......_“嗯,这不可能奏效,但无论如何我都会尝试。”_但果然它做到了 lulz。 谢谢

Jest & 酶配置:在 package.json 中添加以下代码

"jest": {
    "testEnvironment": "jsdom",
    "moduleDirectories": [
      "src",
      "node_modules"
    ],
    "moduleNameMapper": {
      "\\.(css|scss)$": "<rootDir>/__mocks__/styleMock.js",
      "\\.(jpg|gif|ttf|eot|svg)$": "<rootDir>/__mocks__/fileMock.js"
    },
    "transform": {
      "^.+\\.(js|jsx)$": "babel-jest",
      ".+\\.(css|styl|less|sass|scss)$": "<rootDir>/node_modules/jest-css-modules-transform"
    },
    "setupTestFrameworkScriptFile": "<rootDir>/setupTests.js",
    "setupFiles": [
      "<rootDir>setup.js"
    ],
    "moduleFileExtensions": [
      "css",
      "scss",
      "js",
      "json",
      "jsx"
    ],
    "testRegex": "\/test\/spec\/.*\\.js$",
    "transformIgnorePatterns": [
      "/node_modules/(?!test-component).+\\.js$"
    ]
  }

用于设置酶 => setup.js

import { configure } from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'
configure({ adapter: new Adapter() })

对于 setupTestFrameworkScriptFile : setupTests.js global.fetch = require('jest-fetch-mock')

const { JSDOM } = require('jsdom')
const jsdom = new JSDOM('<!doctype html><html><body></body></html>')
const { window } = jsdom

const exposedProperties = ['window', 'navigator', 'document']
const { document } = new JSDOM('').window
global.document = document
global.window = document.defaultView
global.HTMLElement = window.HTMLElement
global.HTMLAnchorElement = window.HTMLAnchorElement

Object.keys(document.defaultView).forEach(property => {
  if (typeof global[property] === 'undefined') {
    exposedProperties.push(property)
    global[property] = document.defaultView[property]
  }
})

global.navigator = {
  userAgent: 'node.js',
}

只是 .tsx 文件面临同样的问题?

只是传播新闻,Jest v24 已更新为在内部使用 Babel 7,不再需要使用babel bridgebabel7-jest
https://twitter.com/i/web/status/1088904207653105664

我将.babelrc重命名babel.config.js并升级到 Babel7,但仍然出现与以前相同的错误。 我的babel.config.js文件:

module.exports = function (api) {
  api.cache(true);

  const presets = ["@babel/preset-env"];

  return {
    presets
  };
}

我安装了@babel/preset-react并将其添加到我的babel.config.js文件中。 修复了错误。

我的babel.config.js文件没有被babel-jest检测到,因为我把它放在__test__目录中。 我将它移动到package.json所在的顶级目录,一切正常。

我通过执行以下操作解决了类似的问题:

1-添加酶设置文件并写入以下内容:

import Enzyme from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

Enzyme.configure({ adapter: new Adapter() });

2- 将 jest 配置添加到您的 package.json 中,如下所示:

"jest": {
 "setupFilesAfterEnv": [
  "./path to your setup file/setupEnzyme.js"
 ]
}

3- 将 .babelrc 文件添加到您的根路径并在其中写入以下内容:

{
    "env": {
        "test": {
            "presets": [
                "@babel/preset-env",
                "@babel/preset-react"
            ]
        }
    }
}

4-如果您在测试中的“expect”关键字出现错误,只需运行npm install -D chai并在您的测试代码中像import { expect } from 'chai';一样导入 expect 函数

如果仍然出现错误,请尝试安装像npm install -D @babel/core @babel/preset-env @babel/preset-react这样的 babel 依赖项

希望这可以帮助。

3天后,我才找到了这个问题的解决方案。
有两种解决方案:

解决方案1:

您可以将文件名从.babelrc更改babel.config.js ,这将起作用。

我的解决方案:

我没有 .babelrc 文件,所以我认为反向操作也应该起作用,并使用来自 babel.config.js 的预设信息创建了一个 .babelrc 文件。 (我创建了一个额外的文件,我没有重命名原始文件)
再次运行测试后,我收到一个新错误: Requires Babel "^7.0.0-0", but was loaded with "6.26.3"
我用谷歌搜索了那个错误,它把我带到了这里。 我按照说明( npm install [email protected] )进行了测试,现在正在运行并通过。

只是传播新闻,Jest v24 已更新为在内部使用 Babel 7,不再需要使用babel bridgebabel7-jest
https://twitter.com/i/web/status/1088904207653105664

升级到 Jest v24 为我解决了这个问题:)

得到unexpected token错误

> 10 | const browser; (末尾的分号)

我的 package.json

 "dependencies": {
    "@babel/cli": "^7.2.3",
    "@babel/core": "^7.3.4",
    "@babel/register": "^7.0.0",
    "assert": "^1.4.1",
    "chai": "^4.2.0",
    "jest-puppeteer": "^4.0.0",
    "screen-info": "^1.0.1",
    "screenres": "^2.0.1"
  },
  "devDependencies": {
    "@babel/plugin-transform-modules-commonjs": "^7.2.0",
    "@babel/preset-env": "^7.3.4",
    "babel-jest": "^24.5.0",
    "babel-preset-env": "^1.7.0",
    "babel-preset-jest": "^24.3.0",
    "jest": "^24.5.0",
    "jest-cli": "^24.5.0",
    "puppeteer": "^1.13.0"
  },
  "jest": {
    "transformIgnorePatterns": [
      "/node_modules/(?!@babel).+\\.js$"
    ],
    "transform": {
      "^.+\\.js?$": "babel-jest"
    }
  },

babel.config.js

module.exports = {
  presets: [
    [
      '@babel/preset-env',
      {
        targets: {
          node: 'current'
        },
      },
      'jest'
    ]
  ],
  env: {
    test: {
      plugins: ['@babel/plugin-transform-modules-commonjs']
    }
  }
}

经过测试的 hoaiduyit 解决方案。 这行得通。 我只需要添加 babel.config.js,在 jest.config.js 中安装babel-jest transform/transpile jest

3天后,我才找到了这个问题的解决方案。
有两种解决方案:

解决方案1:

您可以将文件名从.babelrc更改babel.config.js ,这将起作用。

解决方案2:

我正在使用这种方式。
创建一个这样的转换文件(我的是jest-transforme.js ):

const config = {
  babelrc: false,
  presets: [
    [
      "@babel/env",
      {
        modules: false
      }
    ],
    "@babel/react"
  ],
  plugins: [
    ["@babel/plugin-proposal-decorators", { legacy: true }],
    ["@babel/plugin-proposal-class-properties", { loose: true }],
    "transform-es2015-modules-commonjs"
  ]
};
module.exports = require("babel-jest").createTransformer(config);

这是我的jest.config.js

module.exports = {
  collectCoverageFrom: ["src/**/*.{js,jsx,mjs}"],
  testMatch: ["<rootDir>/src/**/__tests__/**/*.{js,jsx,mjs}", "<rootDir>/src/**/?(*.)(spec|test).{js,jsx,mjs}"],
  transform: {
    "^.+\\.(js|jsx|mjs)$": "<rootDir>/config/jest/jest-transformer.js"
  },
  transformIgnorePatterns: ["[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"]
};

我还有我的.babelrc

const enviroments = require("./env-config.js");

module.exports = {
  presets: [
    [
      "next/babel",
      {
        "preset-env": {
          useBuiltIns: "entry"
        }
      }
    ]
  ],
  plugins: [
    ["styled-components", { ssr: true, displayName: true, preprocess: false }],
    [
      "module-resolver",
      {
        root: ["./"]
      }
    ]
  ],
  env: {
    dev: {
      plugins: [
        ["transform-define", enviroments],
        ["module-resolver", { root: ["./"] }],
        "transform-decorators-legacy",
        "transform-class-properties"
      ]
    },
    build: {
      plugins: [
        ["transform-define", enviroments],
        ["module-resolver", { root: ["./"] }],
        "transform-decorators-legacy",
        "transform-class-properties"
      ]
    },
    production: {
      presets: [
        [
          "minify", // why add minify here, we run uglify over the whole code bundles
          {
            mangle: false,
            evaluate: false
          }
        ]
      ],
      plugins: [
        ["transform-define", enviroments],
        ["@babel/plugin-proposal-decorators", { legacy: true }],
        ["@babel/plugin-proposal-class-properties", { loose: true }],
        ["module-resolver", { root: ["./"] }]
      ],
      comments: false,
      compact: true,
      minified: true
    }
  }
};

希望这可以让你们通过这个问题。 欢呼。

tks你的方法~这个方法可以正确解决我的问题!

嗨 - 我在这个线程中尝试了几件事,但似乎没有任何效果。 主要错误很奇怪 b/c 它似乎指向没有意义的行号,几乎就像源代码和试图运行的实际代码不对齐一样..

这个错误,Jest 遇到了一个意外的令牌,仍然存在。 我在 Jest > 24 上,没有打字稿,它最近(6 个月前~)弹出了一个 react-create-app。 清除缓存和删除 node_modules 没有帮助。 也许有人可以准确解释 jest 需要什么配置才能正确转换和运行,以及我的确切错误给出了什么提示......

FAIL  __e2e__/chat/sms.spec.js
  ● 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:
     • 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/ben/dev/app/webui/node_modules/babel-preset-react-app/node_modules/@babel/runtime/helpers/esm/asyncToGenerator.js:17
    export default function _asyncToGenerator(fn) {
    ^^^^^^

    SyntaxError: Unexpected token export

       5 |   afterEach(async () => {
       6 |     await logout();
    >  7 | 
         | ^
       8 |     await page.evaluate(() => {
       9 |       localStorage.clear();
      10 |     });

      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:471:17)
      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:513:25)
      at Object.<anonymous> (__e2e__/chat/sms.spec.js:7:49)

谢谢你们,

Jenkins 因这个问题而失败,是否有一些可行的解决方案?

对于使用 Create-React-App 的任何人,将transformignorepatterns到您的 package.json 不会解决问题,因为在使用 CRA 时,只能在 package.json 中更改某些笑话配置。

我在 Jest 选择内部库时遇到了问题,无论我从这个库中导入什么,Jest 都会显示“意外令牌”错误。

要解决此问题,您可以将测试脚本更改为以下内容:
"test": "react-scripts test --transformIgnorePatterns 'node_modules/(?!(<your-package-goes-here>)/)'",

大家好,我正在努力用我的小项目 JetSet 进行单元测试,这个项目是用 React Native 编写的。 我搜索了 2 天来解决这个问题,我试图编辑像 babel.config.js 这样的东西,删除那个文件,然后创建 .babel 文件(并添加一些东西)。


_错误报告:_
D:\jetset\JetSetApp>jest SaveData.test.js
失败 __test__/SaveData.test.js
● 测试套件运行失败

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:
 • 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:

D:\jetset\JetSetApp\node_modules\expo-file-system\build\index.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import * as FileSystem from './FileSystem';
                                                                                                ^

SyntaxError: Unexpected token *

  1 | import React, { Component } from 'react'
  2 | import { View, Text, TouchableOpacity, TextInput, StyleSheet } from 'react-native'
> 3 | import { documentDirectory, getInfoAsync, readDirectoryAsync, readAsStringAsync, writeAsStringAsync, deleteAsync } from 'expo-file-system';
    | ^
  4 |
  5 | /**
  6 |  * This class primarily serves to handle files within the phone system so that results can be stored

  at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:537:17)
  at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:579:25)
  at Object.<anonymous> (app/resources/SaveData/SaveData.js:3:1)

测试套件:1 个失败,总共 1 个
测试:0 总
快照:共 0 个
时间:3.509s
运行所有匹配 /SaveData.test.js/i 的测试套件。


_ babel.config.js _
module.exports = 函数(api){
api.cache(true);
返回 {
预设:['babel-preset-expo'],
};
};


_ package.json _
{
"main": "node_modules/expo/AppEntry.js",
“脚本”:{
"start": "展会开始",
"android": "expo start --android",
"ios": "expo start --ios",
"web": "博览会开始 --web",
"eject": "博览会弹出",
“测试”:“开玩笑”
},
“开玩笑”:{
“预设”:“反应原生”
},
“依赖关系”:{
"博览会": "^34.0.1",
"expo-file-system": "^6.0.2",
"expo-mail-composer": "^6.0.0",
"时刻": "^2.24.0",
“反应”:“16.8.3”,
"react-dom": "^16.8.6",
"react-native": " https://github.com/expo/react-native/archive/sdk-34.0.0.tar.gz ",
"react-native-gesture-handler": "^1.3.0",
"react-native-selection-group": "^1.1.2",
"react-native-web": "^0.11.4"
},
“开发依赖”:{
"@babel/core": "^7.6.2",
"@babel/preset-env": "^7.6.2",
"babel-jest": "^24.9.0",
"babel-preset-expo": "^6.0.0",
"jest": "^24.9.0",
"道具类型": "^15.7.2",
"react-native-dismiss-keyboard": "^1.0.0",
"react-native-modal-datetime-picker": "^7.5.0",
“反应导航”:“^3.12.1”
},
“私人”:真的
}

仅供参考,我认为我们最终找到了一个非常愚蠢的解决方案,就像如果没有设置 NODE_ENV="test" ,整个构建系统就会表现不佳。

在较新版本的 React Jest 中内置因此在 package.json 中的测试脚本应该是
"test": "react-scripts test"
代替
"test": "jest"

在较新版本的 React Jest 中内置因此在 package.json 中的测试脚本应该是
"test": "react-scripts test"
代替
"test": "jest"

非常感谢,为我解决了这个问题!

在尝试了很多之后,我的问题是:
.babelrc 文件中缺少"transform-es2015-modules-commonjs",

{
  "presets": ["next/babel"],
  "plugins": [
    ["styled-components", { "ssr": true, "displayName": true, "preprocess": false } ],
    "transform-flow-strip-types",
    "jsx-control-statements",
    "import-glob",
    "transform-es2015-modules-commonjs",
    [
      "import",
      {
        "libraryName": "antd",
        "style": "css"
      }
    ]
  ]
}

"jest": "^24.9.0",
"babel-jest": "23.6.0",

尝试更新你的 jest 和 babel-jest

我将.babelrc重命名babel.config.js并升级到 Babel7,但仍然出现与以前相同的错误。 我的babel.config.js文件:

module.exports = function (api) {
  api.cache(true);

  const presets = ["@babel/preset-env"];

  return {
    presets
  };
}

我安装了@babel/preset-react并将其添加到我的babel.config.js文件中。 修复了错误。

这解决了我的问题,我安装了 @babel/preset-env 并添加到 babel.config.js 并修复了

谢谢@jmayergit

我已将 babel.rc 文件更改为 babel.config.js 文件,但它对我不起作用。 然后我看到了这个答案: https :
如果有导入插件,请将测试、开发和生产环境的插件分开。

我的 babel.config.js 文件现在看起来是这样的:

module.exports = {
  presets: [
    [
      'next/babel',
    ],
  ],
  env: {
    test: {

    },
    dev: {
      plugins: [
        ['import', { libraryName: 'antd', style: 'css' }],
      ],
    },
    production: {
      plugins: [
        ['import', { libraryName: 'antd', style: 'css' }],
      ],
    },
  },
};

从 5 天起,我也在为这个错误而苦苦挣扎

    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:
     • 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:

    SyntaxError: C:\Users\SK-PC\Desktop\React-Course\expansify\src\test\components\MyNavbar.test.js: Unexpected token (5:28)

      3 | import { MyNavbar } from '../../components/MyNavbar'
      4 | test("Should return MyNavbar component", () => {
    > 5 |     const wrapper = shallow(<MyNavbar />)
        |                             ^
      6 |     expect(wrapper.find('.navbar-brand').find('kbd').text()).toBe("Expensify")
      7 |     // const renderer = new ReactShallowRenderer()
      8 |     // renderer.render(<MyNavbar />)

      at Parser._raise (node_modules/@babel/parser/src/parser/location.js:241:45)
      at Parser.raiseWithData (node_modules/@babel/parser/src/parser/location.js:236:17)
      at Parser.raise (node_modules/@babel/parser/src/parser/location.js:220:17)
      at Parser.unexpected (node_modules/@babel/parser/src/parser/util.js:149:16)
      at Parser.parseExprAtom (node_modules/@babel/parser/src/parser/expression.js:1144:20)
      at Parser.parseExprSubscripts (node_modules/@babel/parser/src/parser/expression.js:539:23)
      at Parser.parseMaybeUnary (node_modules/@babel/parser/src/parser/expression.js:519:21)
      at Parser.parseExprOps (node_modules/@babel/parser/src/parser/expression.js:311:23)
      at Parser.parseMaybeConditional (node_modules/@babel/parser/src/parser/expression.js:263:23)
      at Parser.parseMaybeAssign (node_modules/@babel/parser/src/parser/expression.js:211:21)

 PASS  src/test/reducers/filters.test.js

Test Suites: 1 failed, 5 passed, 6 total
Tests:       29 passed, 29 total
Snapshots:   0 total
Time:        12.144s
Ran all test suites.

@fullstacksk

在较新版本的 React Jest 中内置因此在 package.json 中的测试脚本应该是
"test": "react-scripts test"
代替
"test": "jest"

您可以在以下位置阅读文档:
https://jestjs.io/docs/en/tutorial-react
https://create-react-app.dev/docs/running-tests/#docsNav

@猫人1
我还没有安装像 create-react-app 或 react-scripts 这样的依赖项。
它会起作用吗?
"test": "react-scripts test"
代替
"test": "jest"

现在它可以工作了,当我使用 babel-preset-jest 来测试带有 env 和 react 的选项时。 我已经删除了 babel-jeast。

为我工作:在babel.config.js处包含“@babel/preset-react”

https://medium.com/@audreyhal/how -to-solve-jest-error-with-create-react-app-part-1-80f33aa1661a

在犯了一个愚蠢的错误并使用.ts而不是.tsx扩展名编写我的第一个测试文件后,我看到了这个错误。 与最初的问题相去甚远,但我认为它可能对某人有帮助 😄

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