Webpack 意外令牌 ';'

Question

我正在使用 webpack 为我的 Electron.js 应用程序编译 React.js 代码，但是在使用 webpack 编译时出现以下错误：

ERROR in ./app/javascript/configs.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
SyntaxError: /home/alvinzheng/Projects/BlankReact/app/javascript/configs.js: Unexpected token (4:13)

  2 | import * as path from 'path';
  3 | 
> 4 | const dataDir;
    |              ^

configs.js 文件是我存储我的应用程序需要的路径和 url 的地方，在文件末尾我使用 es6 语法导出所有这些。

config.js

的片段

const dataDir;
if(process.platform === "linux"){
    dataDir = path.resolve(require('os').homedir(), 'FOLDER')
}else if(process.platform === "win32"){
    dataDir = path.resolve(process.env.APPDATA, 'FOLDER')
}

export {dataDir}

Webpack 配置：

const path = require('path');
const nodeExternals = require('webpack-node-externals');

module.exports = {
    mode: "production",
    target: 'node',
    externals: [nodeExternals()],

    entry: './app/javascript/index.js',
    output: {
        filename: "index-bundle.js",
        path: path.join(__dirname + "/app/dist/")
    },

    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
            },

            {
                test: /\.css$/,
                use: ['style-loader', 'css-loader']
            },

            {
                test: /\.(woff|woff2|eot|ttf|otf)$/,
                loader: 'file-loader',
                options: {
                    name: '[name].[ext]',
                    outputPath: 'fonts/',
                    publicPath: url => '../assets/fonts/' + url
                }
            }
        ],
    },
}

Babelrc:

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

Answer 1

应该初始化常量。因为您以后无法重新分配值。

查看此文档：SyntaxError: missing = in const declaration。

应该是

let dataDir;

Webpack 意外令牌 ';'

Webpack Unexpected Token ';'

javascript

node.js

webpack

babeljs