jest:测试套件无法运行,SyntaxError:意外的令牌导入

这是我在package.json文件中的jest配置:

"jest": {
    "automock": false,
    "browser": true,
    "moduleNameMapper": {
      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "./app/tests/mocks/FileMock.js",
      "\\.(css|less)$": "identity-obj-proxy"
    },
    "moduleFileExtensions": [
      "js",
      "jsx"
    ],
    "moduleDirectories": [
      "node_modules"
    ],
    "transform": {
      "^.+\\.jsx?$": "./node_modules/babel-jest",
      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "./app/tests/mocks/FileTransformer.js"
    },
    "testEnvironment": "jsdom",
    "testPathDirs": [
      "./app/tests"
    ],
    "testRegex": ".*.test.js",
    "verbose": true
  }

和.babelrc文件位于我的根文件夹中:

{
  "plugins": ["syntax-dynamic-import", "transform-runtime"],
  "presets": [
    [
      "es2015",
      {
        "modules": false
      }
    ],
    "react",
    "stage-0"
  ],
  "env": {
    "start": {
      "presets": [
        "react-hmre"
      ]
    }
  }
}

根据在开玩笑的入门页面上找到的文档,这是我需要让babel工作的所有东西.

无论如何,这个测试:

import React from 'react';
import {shallow} from 'enzyme';
import Landing from '../components/Landing.component';

describe('', () => {
  it('should render a header to the page', () => {
    const landing = shallow();
    expect(landing.find('h1').text()).toBe('This is the Landing component');
  });
});

收益:

FAIL  app/tests/Landing.component.test.js   
 ? Test suite failed to run

   /Users/shooshte/PersonalProjects/surviveJS/app/tests/Landing.component.test.js:1
   ({"Object.":function(module,exports,require,__dirname,__filename,global,jest){import React from 'react';
                                                                                            ^^^^^^
   SyntaxError: Unexpected token import

     at transformAndBuildScript (node_modules/jest-runtime/build/transform.js:320:12)

我究竟做错了什么？

Jest将env变量设置为test,因此我必须将我的预设添加到.babelrc中的env设置:

{
  "plugins": ["syntax-dynamic-import", "transform-runtime"],
  "presets": [
    [
      "es2015",
      {
        "modules": false
      }
    ],
    "react",
    "stage-0"
  ],
  "env": {
    "start": {
      "presets": [
        "react-hmre"
      ]
    },
    "test": {
      "presets": ["es2015", "react", "stage-0"]
    }
  }
}

每个年度预设仅编译当年批准的内容。巴别预置-ENV内容替换es2015，es2016，es2017，latest

在此基础上，对最新的配置，就必须使用/更换你的插件/预置es2015任何esX新的一个：env。

您必须安装babel-preset-env使用npm install。

在您中，.babelrc您应该相应地更新：

{
  "presets": [
    "env", 
    "stage-0", 
    "react-native"
  ],
  "plugins": ...
}