Error: TypeScript emitted no output for when import enum using @ in typescript

Question

我正在使用 typescript 和 vue 3 开发 google chrome 扩展。当我使用此代码在打字稿中导入枚举时：

import { MessageType } from '@/model/message/MessageType';

编译打字稿代码时，显示错误：

./src/background/index.ts 39 bytes [built] [1 error]

ERROR in ./src/background/index.ts
Module build failed (from ./node_modules/ts-loader/index.js):
Error: TypeScript emitted no output for /Users/dolphin/source/reddwarf/frontend/reddwarf-translate-plugin/src/background/index.ts.
    at makeSourceMapAndFinish (/Users/dolphin/source/reddwarf/frontend/reddwarf-translate-plugin/node_modules/ts-loader/dist/index.js:52:18)
    at successLoader (/Users/dolphin/source/reddwarf/frontend/reddwarf-translate-plugin/node_modules/ts-loader/dist/index.js:39:5)
    at Object.loader (/Users/dolphin/source/reddwarf/frontend/reddwarf-translate-plugin/node_modules/ts-loader/dist/index.js:22:5)

ERROR in /Users/dolphin/source/reddwarf/frontend/reddwarf-translate-plugin/src/background/index.ts

为什么会这样？这是枚举定义：

export enum MessageType {
    TRANSLATE = "TRANSLATE"
}

这是 webpack 5.x 配置：

 const path = require('path');
  const webpack = require( 'webpack' );
  const MiniCssExtractPlugin = require( 'mini-css-extract-plugin');
  const HtmlWebpackPlugin = require( 'html-webpack-plugin');
  const CopyPlugin = require("copy-webpack-plugin");
  const { VueLoaderPlugin } = require("vue-loader");

  module.exports = {
    entry : {
      'popup/popup' : './src/popup/',
      'background/background': './src/background' 
    } ,
    resolve: {
      extensions: ['.tsx', '.ts', '.js'],
      alias: {
          vue: 'vue/dist/vue.esm-bundler.js',
          process: 'process/browser',
          //'@': path.resolve(__dirname, 'src'),
      },
    },
    output : {
      path : path.resolve(__dirname, '../../bundle') ,
      filename : '[name].js'
    },
    module : {
      rules : [
        {
          test: /\.ts$/,
          loader: 'ts-loader',
          options: {
            appendTsSuffixTo: [/\.vue$/]
          },
          exclude: /node_modules|\.d\.ts$/
        },
        {
          test: /\.d\.ts$/,
          loader: 'ignore-loader'
        },
        {
          test: /\.vue$/,
          loader: 'vue-loader'
        },
        {
          test : /\.js$/ ,
          exclude : [ /node_modules(?!(\/|\?\)(translation\.js|selection-widget|connect\.io|chrome-env))/ ] ,
          loader : 'babel-loader'
        } ,
        {
          test: /\.css$/i,
          use: [MiniCssExtractPlugin.loader, "css-loader"],
        },
        {
          test : /\.(scss)$/ ,
          use: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader']
        }
      ]
    },
    plugins : [
      new webpack.ProvidePlugin({
        process: 'process/browser',
      }),
      new VueLoaderPlugin(),
      new CopyPlugin({
        patterns: [
          { from: "src/manifest.json", to: "manifest.json" },
          { from: "src/resource/image", to: "resource/image" },
        ],
      }),
      new MiniCssExtractPlugin({
        filename: "[name].css",
        chunkFilename: "[id].css",
      }),
      new HtmlWebpackPlugin({
        filename: 'popup/popup.html',
        template: 'src/popup/index.html'
      }),
      new webpack.DefinePlugin({
        __VUE_OPTIONS_API__: false,
        __VUE_PROD_DEVTOOLS__: false,
      }),
    ]
  };

为什么会这样？我应该怎么做才能避免这个问题？

Answer 1

这个错误可能是由多种原因引起的。一种可能是您没有包含定义枚举的文件。确保包含枚举定义的文件包含在您的项目中。

这可能是由于在 TypeScript 中导入枚举时错误地使用了 @ 符号。确保在导入枚举时使用 @ 符号，并且枚举的名称用引号引起来。

Answer 2

您是否尝试过在组件的数据部分使用枚举？ 可能重复：