Webpack write to file

webpack.config.example.js

/** @type {import('webpack').Configuration} */

/**
 * Write the version of the package to a file named 'latest'
 * When uploaded to a server with multiple versions, you can
 * get the name of the latest by running `curl https://<server>/latest`
 */

const WritePlugin = require('./build-tools/write-webpack-plugin');
const { version } = require('./package.json');

module.exports = {
  ...,
  plugins: [
    new WritePlugin({
      filename: 'latest',
      data: version,
    }),
  ],
  ...,
};

write-webpack-plugin.js

// Included as a dependency of webpack: https://github.com/webpack/webpack/blob/master/package.json
/* eslint-disable import/no-extraneous-dependencies */
const { RawSource } = require('webpack-sources');

const PLUGIN_NAME = 'Write Webpack Plugin';

/**
 * Write some text to a file through the process of a webpack build
 * @class WritePlugin
 */
class WritePlugin {
  /**
   * @param options.filename the name of the file to put in the output directory
   * @param options.data the data to write to the file
   */
  constructor(options = {}) {
    this.options = options;
    this.source = new RawSource(options.data);
  }

  apply(compiler) {
    compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
      compilation.hooks.additionalAssets.tap(
        PLUGIN_NAME,
        () => compilation.emitAsset(this.options.filename, this.source),
      );
    });
  }
}

module.exports = WritePlugin;