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如何解决“无法在模块外部使用导入语句”
我有一个使用TypeScript，Jest，Webpack和Babel构建的React应用程序（不使用Create React App）。尝试运行“ yarn jest”时，出现以下错误： 我尝试删除所有软件包并重新添加它们。它不能解决此问题。我看过类似的问题和文档，但仍然有些误解。我什至遵循了另一本从头开始设置此环境的指南，但我的代码仍然收到此问题。 依赖项包括... "dependencies": { "@babel/plugin-transform-runtime": "^7.6.2", "@babel/polyfill": "^7.6.0", "babel-jest": "^24.9.0", "react": "^16.8.6", "react-dom": "^16.8.6", "react-test-renderer": "^16.11.0", "source-map-loader": "^0.2.4" }, "devDependencies": { "@babel/core": "^7.6.0", "@babel/preset-env": "^7.6.0", "@babel/preset-react": "^7.0.0", "@types/enzyme": "^3.9.2", "@types/enzyme-adapter-react-16": "^1.0.5", "@types/jest": "^24.0.13", 组件的导入行... import * as React from "react"; import { BrowserRouter as Router, …