Adding a csv file to a webpack build

Question

I have placed a csv file in my assets folder for my react app, however, that file is not getting picked up and added to my dist build via webpack (the images are still added as assets to the build but the csv file is not). You can see my webpack build below. So how do I add a csv file to my dist build via webpack (the goal is for users of my app to be able to download this file)? Thanks!

webpack.dev.js

const merge = require('webpack-merge');
const common = require('./webpack.common.js');

const config = merge(common, {
  mode: 'development',
  devtool: 'inline-source-map',
  devServer: {
    contentBase: './dist',
    historyApiFallback: true,
    hot: true,
    proxy: {
      '/api': {
        target: 'http://localhost:5001',
        secure: false,
      },
    },
    allowedHosts: [
      'localhost',
      'fatpandadev'
    ],
    public: 'fatpandadev:8080'
  },
});

module.exports = config;

webpack.common.js

const path = require('path');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");

const DIST_DIR = path.resolve(__dirname, "dist");
const SRC_DIR = path.resolve(__dirname, "src");

const config = {
  entry: [
    "babel-polyfill",
    `${SRC_DIR}/app/index.js`,
    `${SRC_DIR}/app/assets/stylesheets/application.scss`,
    `${SRC_DIR}/app/components/index.scss`,
    "font-awesome/scss/font-awesome.scss",
    "react-datepicker/dist/react-datepicker.css",
    "rc-time-picker/assets/index.css",
    "react-circular-progressbar/dist/styles.css",
    "@trendmicro/react-toggle-switch/dist/react-toggle-switch.css",
  ],
  output: {
    path: `${DIST_DIR}/app/`,
    filename: "bundle.js",
    publicPath: "/app/"
  },
  module: {
    rules: [
      {
        enforce: "pre",
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "eslint-loader",
        options: {
          failOnWarning: false,
          failOnError: true
        }
      },
      {
        test: /\.js$/,
        include: SRC_DIR,
        loader: 'babel-loader',
        query: {
          presets: ['react', 'stage-2']
        }
      },
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader'
        ]
      },
      {
        test: /\.scss$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          'sass-loader'
        ]
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        loaders: ['file-loader?context=src/images&name=images/[path][name].[ext]', {
          loader: 'image-webpack-loader',
          query: {
            mozjpeg: {
              progressive: true,
            },
            gifsicle: {
              interlaced: false,
            },
            optipng: {
              optimizationLevel: 7,
            },
            pngquant: {
              quality: '75-90',
              speed: 3,
            },
          },
        }],
        exclude: path.resolve(__dirname, "node_modules"),
        include: __dirname,
      },
      {
        test: /\.woff2?(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        // loader: "url?limit=10000"
        use: "url-loader"
      },
      {
        test: /\.(ttf|eot|svg)(\?[\s\S]+)?$/,
        use: 'file-loader'
      },
      {
        test: /\.(txt|csv)$/,
        use: [
          {
            loader: 'file-loader',
            options: {}
          }
        ]
      },
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "application.css"
    })
  ]
};

module.exports = config;

Answer 1

(this answer is only referenced on the server side)

In addition to @PlayMa256, On Server side(Nodejs runtime), you may need emitFile: true

{
  test: /\.(txt|csv|mmdb)$/,
  use: [
    {
      loader: 'file-loader',
      options: {
        name: "[path][name].[ext]",
        emitFile: true,
      },
    },
  ],
},

Refer to this PR: https://github.com/webpack-contrib/file-loader/pull/135

In my opinion, file-loader way seem to better than copy-webpack-plugin way.

You can test like below:

import csvPath from './assets/data.csv'
console.log(csvPath)          // assets/data.csv

Tested version:

$ cat node_modules/webpack/package.json | jq .version
"4.29.5"
$ cat node_modules/file-loader/package.json | jq .version
"3.0.1"

Answer 2

You might want to check the CopyWebpackPlugin if you have no need to process/parse the files, but only to copy them to your dist folder.

Copy Webpack Plugin

Copies individual files or entire directories to the build directory

Install

npm i -D copy-webpack-plugin

Usage

webpack.config.js

const CopyWebpackPlugin = require('copy-webpack-plugin')

const config = {
    plugins: [
      new CopyWebpackPlugin([ ...patterns ], options)
    ]
  }

Patterns

A simple pattern looks like this

{ from: 'source', to: 'dest' }