React导入styled-components的createGlobalStyle报import模块外使用错误

触发报错：SyntaxError: Cannot use import statement outside a module
问题触发场景：从styled-components中导入createGlobalStyle时出现该报错，已尝试在package.json中添加"type": "module"配置，未生效。
涉及组件：GlobalStyle组件，目前在login.jsx、index.jsx两个文件中被引入使用。

相关代码 #

GlobalStyle.jsx #

import { createGlobalStyle } from "styled-components";
// eslint-disable-next-line
import React from 'react';

const GlobalStyle = createGlobalStyle` 
    body {
        width: 100%;
        margin: 0;
    }
`; 

export default GlobalStyle; 

package.json #

{
  "name": "dev-lio",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.16.4",
    "@testing-library/react": "^13.3.0",
    "@testing-library/user-event": "^13.5.0",
    "react": "^18.1.0",
    "react-dom": "^18.1.0",
    "react-router-dom": "^6.3.0",
    "react-scripts": "^5.0.1",
    "web-vitals": "^2.1.4"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "babel-plugin-styled-components": "^2.0.7"
  }
}

login.jsx #

import React from 'react'
import GlobalStyle from '../../components/GlobalStyle';
import GlobalFonts from '../../fonts/fonts'
import LoginForm from '../../components/LoginForm';

const Login = () => {
    return (
        <div>
            <LoginForm />
            <GlobalFonts />
            <GlobalStyle />
        </div>
    )
}

export default Login;

index.jsx #

import React from 'react'
import GlobalStyle from '../../components/GlobalStyle';
import Header from '../../components/Header';
import Profile from '../../components/Profile';
import GlobalFonts from '../../fonts/fonts';

const Main = () => {
    return (
        <div>
            <Header />
            <Profile />
            <GlobalFonts />
            <GlobalStyle />
        </div>
    )
}

export default Main;

• 第一步先删掉package.json里手动加的"type": "module"配置。Create React App脚手架默认的模块解析规则不支持这个配置，加了之后会和babel、webpack的内置逻辑冲突，直接触发导入语法报错。
• 检查依赖安装情况：当前依赖列表里只有babel的styled-components插件，没装styled-components核心包，执行安装命令：

  npm install styled-components
  

  用yarn的话执行：

  yarn add styled-components
  

• 安装完如果还报错，直接删掉项目根目录下的node_modules文件夹和锁文件（npm对应package-lock.json，yarn对应yarn.lock），重新执行npm install或者yarn安装全部依赖，再启动项目即可。
• 额外排查点：确认所有组件文件后缀为.jsx/.js，组件导入路径拼写正确，没有把文件放错目录。

内容的提问来源于stack exchange，提问作者hyehye