create-react-app无法解析模块

Question

我正在升级较旧的react应用程序以使用最新的和最大的应用程序，但我似乎无法弄清楚为什么几乎所有模块都无法解析。

似乎在某些时候您可以直接指向导入中的文件夹，但现在它不再解析

在我的Webpack中，我相信我已经正确设置了它。有人知道进口带来了什么变化吗？

resolve: {
    // This allows you to set a fallback for where Webpack should look for modules.
    // We placed these paths second because we want `node_modules` to "win"
    // if there are any conflicts. This matches Node resolution mechanism.
    // https://github.com/facebookincubator/create-react-app/issues/253
    modules: ["node_modules", paths.appNodeModules].concat(
      // It is guaranteed to exist because we tweak it in `env.js`
      process.env.NODE_PATH.split(path.delimiter).filter(Boolean),
      path.resolve(__dirname, "src")
    ),
    // These are the reasonable defaults supported by the Node ecosystem.
    // We also include JSX as a common component filename extension to support
    // some tools, although we do not recommend using it, see:
    // https://github.com/facebookincubator/create-react-app/issues/290
    // `web` extension prefixes have been added for better support
    // for React Native Web.
    extensions: [
      ".web.js",
      ".mjs",
      ".js",
      ".json",
      ".web.jsx",
      ".jsx",
      ".scss",
      ".css",
      ".json"
    ]

Answer 1

问题是path.resolve（__ dirname，“ src”）似乎无法解决我的想法。

const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = relativePath => path.resolve(appDirectory, relativePath);

 module.exports = {
  dotenv: resolveApp('.env'),
  appBuild: resolveApp('build'),
  appPublic: resolveApp('public'),
  appHtml: resolveApp('public/index.html'),
  appIndexJs: resolveApp('src/main.jsx'),
  appPackageJson: resolveApp('package.json'),
  appSrc: resolveApp('src'),
  yarnLockFile: resolveApp('yarn.lock'),
  testsSetup: resolveApp('src/setupTests.js'),
  appNodeModules: resolveApp('node_modules'),
  publicUrl: getPublicUrl(resolveApp('package.json')),
  servedPath: getServedPath(resolveApp('package.json')),
};


modules: ["node_modules", paths.appNodeModules].concat(
      // It is guaranteed to exist because we tweak it in `env.js`
      process.env.NODE_PATH.split(path.delimiter).filter(Boolean),
      paths.appSrc
    ),
    // These are the reasonable defaults supported by the Node ecosystem.
    // We also include JSX as a common component filename extension to support
    // some tools, although we do not recommend using it, see:
    // https://github.com/facebookincubator/create-react-app/issues/290
    // `web` extension prefixes have been added for better support
    // for React Native Web.
    extensions: [
      ".web.js",
      ".mjs",
      ".js",
      ".json",
      ".web.jsx",
      ".jsx",
      ".scss",
      ".css",
      ".json"
    ]