Entrypoint undefined = index.html using HtmlWebpac

问题:

I'm using Webpack 4 and I'm creating the config file, when trying to use the HtmlWebpackPlugin it got this on the console: Entrypoint undefined = index.html, it opens the browser and the HTML does appear but I'm getting this weird message on the console, how to solve this?

That is how my config file looks like:

'use strict'

const webpack = require('webpack')
const { join, resolve } = require('path')

const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  mode: 'development', // dev
  devtool: 'cheap-module-eval-source-map', // dev
  entry: join(__dirname, 'src', 'index.js'),
  output: {
    filename: 'bundle.js',
    path: resolve(__dirname, 'dist')
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      }
    ]
  },
  resolve: {
    extensions: ['*', '.js', '.jsx']
  },
  devServer: {
    contentBase: resolve(__dirname, 'build')
  },
  plugins: [
    new webpack.ProgressPlugin(),
    new HtmlWebpackPlugin({
      template: join(__dirname, 'public', 'index.html')
    }),

    new webpack.HotModuleReplacementPlugin(), // dev
    new webpack.NoEmitOnErrorsPlugin() // dev
  ]
}

回答1:

Try this; you might be making wrong template path :

 new HtmlWebpackPlugin({
        template: resolve(__dirname, 'src/public', 'index.html'),
        filename: './index.html'
      }),

If public is in src folder this should work It's my assumption. Let me know if the issue still persists.

回答2:

According to the creators of HtmlWebpackPlugin it's just a meaningless log message and an ignorable cosmetic issue. See this comment on the issue.

回答3:

It seems like a problem with the extension of the template firing an unwanted loader. If the extension of the template is changed to any other the plugin will work.

If you're using the default webpack template system (EJS, as of webpack 4) it makes sense to use ejs because the template isn't valid html anymore:

new HtmlWebpackPlugin({
    // it works without 'path.resolve()'. No need for 'filename', defaults to 'index.html'
    template: "./public/index.ejs",
}),

webpack considers by default that the template is EJS and will automatically process it with the proper loader. If you use any other template system you will have to add the corresponding loader. More info on official documentation.