React 流程中的 Props 类型错误，将 create-react 应用程序转换为 webpack

Question

我正在尝试将 create-react 应用程序转换为 webpack 应用程序。这背后的背景是我最初有一个使用 create-react 制作的应用程序。我想运行使用 webpack 的那个项目。我拿了一个我在 webpack 上运行ning 的应用程序，然后我删除了它的所有源文件，用 create react 应用程序中的源文件替换了它。之后，我将 package.json 依赖项从 create-react 应用程序的 package.json 中移出。我想也许我需要在 webpack 中进行一些额外的配置来处理流程。我需要故障排除方面的帮助。我收到此类错误：

ERROR in ./src/js/constants/Routes.jsx
Module build failed (from ./node_modules/babel-loader/lib/index.js):
SyntaxError: Unexpected token, expected ";" (7:5)

   5 | import { reduxConnect } from '../hoc';
   6 | 
>  7 | type Props = {

这是我的 webpack.config.js:

const path = require('path');

const config = {
    entry: __dirname + '/src/js/index.js',
    output: {
        path: __dirname + '/grails-app/assets/javascripts',
        publicPath: '/assets/',
        filename: 'bundle.js'
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                use: 'babel-loader',
                exclude: /node_modules/
            },
            {
                test: /\.css$/,
                use: [
                    'style-loader',
                    'css-loader'
                ]
            }
        ]
    },
    resolve: {
        extensions: [
            '.js',
            '.jsx'
        ]
    }
};

module.exports = config;

这是我的 .babelrc

  "presets": [
    "@babel/preset-env",
    "@babel/preset-react"
  ]
}

package.json（我在生产模式下运行所以忽略 devDependencies）：

{
  "name": "KahuDealerWeb",
  "version": "1.0.0",
  "description": "Vehicle Finance 3.0 ====================",
  "main": "index.js",
  "directories": {
    "lib": "lib",
    "test": "test"
  },
  "scripts": {
    "watch": "webpack --watch --colors --progress",
    "bundle": "webpack"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/ProconGPS/KahuDealerWeb.git"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/ProconGPS/KahuDealerWeb/issues"
  },
  "homepage": "https://github.com/ProconGPS/KahuDealerWeb#readme",
  "dependencies": {
    "@babel/core": "^7.0.1",
    "@babel/preset-env": "^7.0.0",
    "@babel/preset-flow": "^7.10.1",
    "@babel/preset-react": "^7.0.0",
    "@material-ui/core": "^4.10.1",
    "@material-ui/icons": "^4.9.1",
    "axios": "^0.19.0",
    "babel-loader": "^8.0.2",
    "core-js": "^3.1.3",
    "css-loader": "^3.5.3",
    "lodash": "^4.17.11",
    "material-ui-icons": "^1.0.0-beta.36",
    "node-sass": "^4.10.0",
    "react": "^16.13.1",
    "react-cookies": "^0.1.0",
    "react-dom": "^16.13.1",
    "react-modal": "^3.11.1",
    "react-redux": "^5.0.7",
    "react-router-dom": "^4.2.2",
    "react-select": "^2.2.0",
    "react-to-print": "^2.5.1",
    "recharts": "^1.8.5",
    "redux": "^3.7.2",
    "redux-observable": "^0.18.0",
    "rxjs": "^5.5.6",
    "rxjs-compat": "^6.3.3",
    "style-loader": "^1.2.1",
    "webpack": "^4.18.1",
    "webpack-cli": "^3.1.0",
    "webpack-dev-server": "^3.1.8"
  },
  "devDependencies": {
    "babel-core": "^6.26.3",
    "babel-loader": "^8.1.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.11"
  }
}

Answer 1

Flow 语法不是真正的 JS。所以像 type Props 这样的东西在转译或捆绑时会分崩离析。您需要添加一个 babel plugin/preset 来处理这些情况。

这是您要添加的内容： https://babeljs.io/docs/en/babel-preset-flow

但具体来说，使用 yarn 或 npm

安装 @babel/preset-flow

然后在您的 .babelrc 中更新您的配置以添加新预设

{
  "presets": [
    "@babel/preset-env",
    "@babel/preset-react",
    "@babel/preset-flow"
  ]
}

React 流程中的 Props 类型错误，将 create-react 应用程序转换为 webpack

Error on type Props in react flow, converting create-react app to webpack

reactjs

webpack

flowtype