Loaders allow you to pre-process and transform files as you load them. An example would be converting TypeScript to JavaScript. Let's see an example snippet from the webpack.config.js file:
const path = require('path');const config = { output: { filename: 'my-first-webpack.bundle.js' }, module: { rules: [ { test: /\.txt$/, use: 'raw-loader' } ] }};module.exports = config;
The preceding code snippet tells webpack to process all the text files using a loader named raw-loader, and loads raw UTF-8 content from the file.
Loaders are essentially node modules that is a function like the following one, and the source parameter consists of all the source code as a string:
const loaderUtils = require('loader-utils');module.exports = function ...
