parse static files and replace [@VAR@] place holders with values from firebase

import {config} from './../config/config';
const firebase = require('firebase');
const moment = require('moment');
const recursive = require('recursive-readdir');
const fs = require('fs');
const numeral = require('numeral');

firebase.initializeApp({
  databaseURL: config.firebase.db_name,
  serviceAccount: './config/firebase.json'
});
const db = firebase.database();

const run_replace = (values) => {
  return new Promise((resolve, reject) => {
    recursive('./dist/', ['*.css', '.nojekyll'], function (err, files) {
      files.forEach(file => {
        let data = fs.readFileSync(file);
        data = data.toString();
        if (data.indexOf('[@') !== -1) {

          if (data.indexOf('[@') !== -1) {
            let matches = data.match(/\[\S+@]/g);
            if (matches && matches.length > 0) {
              matches.forEach(m => {
                // formating flags goes after constant name and __ ex.: VAR__NUMBER to format as number: 1 000 000
                if (m.indexOf('__NUMBER') !== -1) {
                  let variable = m.replace('[@', '').replace('__NUMBER@]', '');
                  let value = numeral(values[variable]).format('0,0');
                  console.log(`var: ${variable} m: ${m} value: ${value}`);
                  data = data.split(m).join(value);
                }
              });
            }
          }

          if (data.indexOf('[@') !== -1) {
            let matches = data.match(/\[\S+@]/g);
            if (matches && matches.length > 0) {
              matches.forEach(m => {
                console.log(`**** MISSING VALUE ****  ${file} -----> ${m}`);
              });
            }
          }

          fs.writeFileSync(file, data);

        }
      });
      resolve();
    });
  });
};

const deploy = () => {
  return new Promise((resolve, reject) => {

    db.ref('constants').once('value', snapshot => {
      let constants = snapshot.val();
      const now = moment(new Date());
      let values = {};

      Object.keys(constants).forEach(c => {
        let constant = constants[c];
        values[c] = constant.value;
        var end = moment(constant.at);
        var duration = moment.duration(end.diff(now));
        var days = duration.asDays();

        if (days < -14) {
          console.error(`#sdjfdsl value of ${c} is ${days} days old.`);
        }
        run_replace(values)
          .then(() => resolve())
          .catch(e => reject())
        ;
      });

    });

  });
};

deploy()
  .then(() => {
    process.exit(0);
  });