CustomVersionFilePlugin.js

const fs = require('fs');
const path = require('path');
const APP_VERSION = require('../../package.json').version;

/**
 * Simple webpack plugin that writes the app version (from package.json) and the webpack hash to './version.json'
 */
class CustomVersionFilePlugin {
    apply(compiler) {
        compiler.hooks.done.tap(
            this.constructor.name,
            () =>
                new Promise((resolve, reject) => {
                    const versionPath = path.join(__dirname, '/../../dist/version.json');
                    fs.mkdir(path.dirname(versionPath), {recursive: true}, (dirErr) => {
                        if (dirErr) {
                            reject(dirErr);
                            return;
                        }
                        fs.writeFile(versionPath, JSON.stringify({version: APP_VERSION}), 'utf8', (fileErr) => {
                            if (fileErr) {
                                reject(fileErr);
                                return;
                            }
                            resolve();
                        });
                    });
                }),
        );
    }
}

module.exports = CustomVersionFilePlugin;