再加上Bartek Maciejiczek的回答，下面是Craco的情况:

const ModuleScopePlugin = require("react-dev-utils/ModuleScopePlugin");
const path = require("path");

module.exports = {
  webpack: {
    configure: webpackConfig => {
      webpackConfig.resolve.plugins.forEach(plugin => {
        if (plugin instanceof ModuleScopePlugin) {
          plugin.allowedFiles.add(path.resolve("./config.json"));
        }
      });
      return webpackConfig;
    }
  }
};

我之前的解决方案适用于Webpack 4，但不适用于Webpack 5。在浏览了从那时起积累的解决方法之后，我发现下面的方法非常简单(而且似乎是可扩展的)。

import { CracoAliasPlugin } from 'react-app-alias';

const cracoConfig = {
  plugins: [
    {
      plugin: CracoAliasPlugin,
      options: {
        alias: { '~': './' },
      },
    },
  ],
}

然后像这样导入:

import whatever from '~/<path-to-file>';

这是我的代码:

import React from 'react';

import './Navbar.scss';
import {images} from '../../constants';
const Navbar = () => {
    return (
        <nav>
            <div>
                < img src = {images.logo} alt = "logo" />

            </div>

        </nav>
    );
}

export default Navbar;

也改了:

import React from 'react';

import './Navbar.scss';
import {images} from '././constants';
const Navbar = () => {
    return (
        <nav>
            <div>
                < img src = {images.logo} alt = "logo" />

            </div>

        </nav>
    );
}

export default Navbar;

它成功了!我越来越擅长修复bug，哈哈。

因此，显然，使用Create-react-app将限制你访问项目根目录以外的图像——通常是src。

解决这个问题的一个快速方法是将图像从public文件夹移动到src文件夹，这样就可以了。 所以你的代码应该是这样的:

background-image: URL('/src/images/img-2.jpg');

如果您只需要导入单个文件，如README。Md或package。json，那么它可以显式地添加到ModuleScopePlugin()

配置/ paths.js

const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
module.exports = {
  appPackageJson: resolveApp('package.json'),
  appReadmeMD:    resolveApp('README.md'),
};

Config /webpack.config.dev.js + Config /webpack.config.prod.js

module.exports = {
  resolve: {
    plugins: [
      // Prevents users from importing files from outside of src/ (or node_modules/).
      // This often causes confusion because we only process files within src/ with babel.
      // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
      // please link the files into your node_modules/ and let module-resolution kick in.
      // Make sure your source files are compiled, as they will not be processed in any way.
      new ModuleScopePlugin(paths.appSrc, [
          paths.appPackageJson,
          paths.appReadmeMD         // README.md lives outside of ./src/ so needs to be explicitly included in ModuleScopePlugin()
      ]),
    ]
  }
}

此限制确保所有文件或模块(导出)都在src/目录中，实现在./node_modules/react-dev-utils/ModuleScopePlugin.js中，在以下代码行中。

// Resolve the issuer from our appSrc and make sure it's one of our files
// Maybe an indexOf === 0 would be better?
     const relative = path.relative(appSrc, request.context.issuer);
// If it's not in src/ or a subdirectory, not our request!
     if (relative.startsWith('../') || relative.startsWith('..\\')) {
        return callback();
      }

您可以通过

修改这段代码(不推荐) 或者执行eject，然后从目录中删除ModuleScopePlugin.js。 const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');从。/ node_modules / react-scripts / config / webpack.config.dev.js

PS:注意弹出的后果。

下面是一个在简单情况下工作得很好的替代方案(使用fs和ncp)。在开发过程中，保持一个脚本运行，以监视/src之外的共享文件夹的更改。当进行更改时，脚本可以自动将共享文件夹复制到项目中。下面是递归地查看单个目录的示例:

// This should be run from the root of your project

const fs = require('fs')
const ncp = require('ncp').ncp;

ncp.limit = 16

// Watch for file changes to your shared directory outside of /src
fs.watch('../shared', { recursive: true }, (eventType, filename) => {
    console.log(`${eventType}: ${filename}`)

    // Copy the shared folder straight to your project /src
    // You could be smarter here and only copy the changed file
    ncp('../shared', './src/shared', function(err) {
        if (err) {
          return console.error(err);
        }

        console.log('finished syncing!');
    });
})