javascript - 无法运行Jest测试:`SyntaxError:意外 token <`

我知道这可能是以前发布的，但是我真的对为什么我的测试无法在我的React项目中工作感到困惑。这是我的.babelrc文件：

{
    "presets": ["react", "es2015", "stage-0"],

    "plugins": [
        "transform-runtime",
        "add-module-exports",
        "transform-decorators-legacy"
    ],

    "env": {
        "development": {
            "plugins": [
                "typecheck",
                ["react-transform", {
                    "transforms": [{
                        "transform": "react-transform-catch-errors",
                        "imports": ["react", "redbox-react"]
                    }]
                }]
            ]
        },
        "test": {
            "presets": ["es2015", "react", "stage-0"],
            "plugins": [
                "transform-runtime",
                "add-module-exports",
                "transform-decorators-legacy"
            ]
        }
    }
}

这是我在package.json中的笑话设置

  "jest": {
    "moduleFileExtensions": [
      "js",
      "jsx",
      "json"
    ],
    "moduleNameMapper": {
      "ExampleTest": "<rootDir>/app/pages/ExampleTest.js"
    },
    "moduleDirectories": [
      "app",
      "node_modules"
    ]
  },

我收到的错误是Test suite failed to run... SyntaxError: Unexpected token <。

从我能说出的错误来看，它试图运行的文件中包含JSX / ES6代码...而且它不知道该如何转译？这很奇怪，因为我已经在.babelrc中告诉它这样做。我还为Jest提供了适当的moduleDirectories。

任何帮助将不胜感激。

最佳答案

JSON中的最后一个逗号是错误的。它应该看起来像：

{"root":{
    "presets": ["react", "es2015", "stage-0"],

    "plugins": [
        "transform-runtime",
        "add-module-exports",
        "transform-decorators-legacy"
    ],

    "env": {
        "development": {
            "plugins": [
                "typecheck",
                ["react-transform", {
                    "transforms": [{
                        "transform": "react-transform-catch-errors",
                        "imports": ["react", "redbox-react"]
                    }]
                }]
            ]
        },
        "test": {
            "presets": ["es2015", "react", "stage-0"],
            "plugins": [
                "transform-runtime",
                "add-module-exports",
                "transform-decorators-legacy"
            ]
        }
    }
}}

关于javascript - 无法运行Jest测试:`SyntaxError:意外 token <`，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45246815/