accounts-frontend/scripts/build-dll.js

/* eslint-env node */
/* eslint-disable no-console */

const fs = require('fs');

const webpack = require('webpack');
const chalk = require('chalk');

const webpackConfig = require('../webpack.dll.config.js');

const compiler = webpack(webpackConfig);

Promise.all([
    stat(`${__dirname}/../yarn.lock`),
    stat(`${__dirname}/../dll/vendor.json`)
])
    .then((stats) => {
        const lockFile = new Date(stats[0].mtime);
        const dll = new Date(stats[1].mtime);

        if (dll < lockFile) {
            return Promise.reject({
                code: 'OUTDATED'
            });
        }

        logResult(chalk.green('Current dlls are up to date!'));
    })
    .catch((err) => {
        if (err.code !== 'ENOENT' && err.code !== 'OUTDATED') {
            return Promise.reject(err);
        }

        console.log('Rebuilding dlls...');

        return new Promise(((resolve, reject) => {
            compiler.run((err, stats) => {
                if (err) {
                    return reject(err);
                }

                logResult(
                    chalk.green('Dll was successfully build in %s ms'),
                    stats.endTime - stats.startTime
                );

                resolve();
            });
        }));
    })
    .catch((err) => {
        logResult(chalk.red('Unexpected error checking dll state'), err);
        process.exit(1);
    });

function logResult() {
    console.log('\n');
    console.log.apply(console, arguments);
    console.log('\n');
}

function stat(path) {
    return new Promise(((resolve, reject) => {
        fs.stat(path, (err, stats) => {
            err ? reject(err) : resolve(stats);
        });
    }));
}