ex-helpers-element/tools/prebuild.js

const rimraf = require('rimraf');
const path = require('path');
const fs = require('fs');
const util = require('util');
const forEach = require('lodash/forEach');

const root = path.resolve(__dirname, '..');
const distPath = path.resolve(__dirname, '..', 'dist');

console.log('Removing', distPath);
const distClearPromise = util.promisify(rimraf)(distPath);

const oldPacksPromise = new Promise((resolve, reject) => {
    util.promisify(fs.readdir)(root)
        .then(files => {
            const promises = [];
            forEach(files, file => {
                if (/\.tgz$/.test(file)) {
                    const fullPath = path.resolve(root, file);
                    console.log('Removing', fullPath);
                    promises.push(util.promisify(fs.unlink)(fullPath));
                }
            });
            Promise.all(promises).then(resolve, reject);
        }, reject);
});

Promise.all([
    distClearPromise,
    oldPacksPromise
])
    .then(() => {
        console.log('Done');
        process.exit()
    }, e => {
        console.error(e);
    });