我已经多次问过这个问题，但我遇到的所有解决方案似乎都不适合我 . 我在尝试为Vue应用程序运行Jest测试时遇到以下错误 .
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://facebook.github.io/jest/docs/en/configuration.html
Details:
/node_modules/vue-awesome/icons/expand.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import Icon from '../components/Icon.vue'
^^^^^^
SyntaxError: Unexpected token import
> 17 | import 'vue-awesome/icons/expand'
.babelrc：
{
"presets": [
["env", {
"modules": false,
"targets": {
"browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
}
}]
],
"env": {
"test": {
"presets": [
["env", { "targets": { "node": "current" }}]
]
}
}
}
package.json中的jest配置：
"jest": {
"moduleFileExtensions": [
"js",
"vue"
],
"moduleNameMapper": {
"^@/(.*)$": "<rootDir>/src/$1"
},
"transform": {
"^.+\\.js$": "<rootDir>/node_modules/babel-jest",
".*\\.(vue)$": "<rootDir>/node_modules/vue-jest"
},
"snapshotSerializers": [
"<rootDir>/node_modules/jest-serializer-vue"
],
"moduleDirectories": [
"node_modules",
"src"
]
}
看起来，为测试安装的Vue组件的脚本中的初始导入正在工作，但模块本身（ import Icon from '../components/Icon.vue ）内的导入无法识别 .
我该如何解决这个问题？
2 回答
你只需要确保
vue-awesome将被jest转换，所以添加以下内容到你的jest配置：这意味着：“忽略除
vue-awesome之外的node_modules中的所有内容 .此处还有可能导致此错误的其他问题的详尽列表：https://github.com/facebook/jest/issues/2081
如果您在更新到较新的Jest版本后遇到此问题，请尝试通过运行以下命令清除Jest的内部缓存：