inline firestore sdk in order to load it without remote deps at runtime

rollup.config.js

import { existsSync } from 'fs';
import fetch from 'node-fetch';
const REMOTE_FIREBASE_URL = 'https://www.gstatic.com/firebasejs/9.15.0/';

export default {
  plugins: [{
      transform: function transform(code, id) {
        return code.replace(/\.\/firebase\//g, REMOTE_FIREBASE_URL)
      },
      resolveDynamicImport: function(importee) {
        if (!existsSync(importee)) {
          return importee
        }
      },
      load: async function transform(id, options, outputOptions) {
        if (!existsSync(id)) {
          const response = await fetch(id);
          const code = await response.text();

          return code
        }
        return null
      }
    },
    {
      resolveId: function(importee, importer, options) {
        if (!importer) {
          return null
        }
        return importee
      }
    }
  ],
  output: {
    inlineDynamicImports: true
  }
};