After executing webpack, it has been noticed that one of the dist files consistently ends up empty

As someone who is new to webpack, I have successfully used the quick start guide to process a simple JS file from src to dist. Everything was working fine.

However, I encountered an issue when trying to process more than one JS file. The original tutorial file is still processed correctly and appears in the dist folder. However, a newly created JS file that I added only creates an empty file in the dist folder, without actually minifying the JS.

So, while /dist/scripttwo.js is generated properly, /dist/scriptone.js remains an empty file.

This is my webpack configuration:

const path = require('path');

module.exports = {
    entry: {
      scriptone: './src/scriptone.js',
      scripttwo: './src/scripttwo.js'
    },
    output: {
        filename: '[name].js',
        path: path.resolve(__dirname, 'dist'),
    },
};

Content of scriptone.js:

function sayhello() {
  return 'hello again';
}

Content of scripttwo.js:

import _ from 'lodash';

function component() {
  const element = document.createElement('div');

  // Lodash, currently included via a script, is required for this line to work
  element.innerHTML = _.join(['Hello', 'webpack'], ' ');

  return element;
}

document.body.appendChild(component());

Answer №1

One reason for this issue is the lack of exporting or importing in connection to scriptone.js.

To verify this, export sayhello from scriptone.js by appending the following code at the end of the file:

export default sayhello

Next, in scripttwo.js, import the function and incorporate it within the file like so:

import _ from 'lodash';
import sayhello from './scriptone.js';

function component() {
  const element = document.createElement('div');

  // The presence of Lodash, currently imported via a script, is crucial for this line to execute properly
  element.innerHTML = _.join(['Hello', 'webpack'], ' ') + sayhello();

  return element;
}

document.body.appendChild(component());

Answer №2

If you specify the mode: "development" configuration, the code will be present.

By default, when using Webpack, it utilizes production mode. Starting from Webpack version 4 and above, your code will be minified and tree shaking will occur by default in production mode. The code within scriptone.js serves no purpose, as it does not have any side effects and is considered dead code by Webpack, resulting in its removal. As a result, an empty dist/scriptone.js bundle file is produced.

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