install.js

/* eslint-disable eol-last */
const fs = require('fs/promises');
const { spawn } = require('child_process');
const path = require('path');
const root = process.cwd();

// eslint-disable-next-line func-style
function npmInstall(cwd) {
      return new Promise(resolve => {
            const childProcess = spawn('npm', ['install'], { cwd });
            childProcess.on('exit', resolve);
      });
}

// eslint-disable-next-line func-style
async function install() {
      const base = path.resolve(root);
      const ignoreFolders = ['node_modules'];
      const deps = (await fs.readdir(base, { withFileTypes: true }))
            .filter(dep => dep.isDirectory())
            .filter(dep => !ignoreFolders.includes(dep.name))
            .map(folder => path.resolve(base, folder.name))
            .concat([base])
            .map(dep => npmInstall(dep));

      await Promise.all(deps);
      // eslint-disable-next-line no-console
      console.log('Done!');
}

install();