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File: utils.js

var rollup = require('rollup').rollup;
var pack   = require('../package.json');
var banner = require('./banner.js');
var fs     = require('fs');
var zlib   = require('zlib');
var uglify = require('uglify-js');

var toUpper = function(_, c) {
  return c ? c.toUpperCase() : '';
};

const classifyRE = /(?:^|[-_\/])(\w)/g;
var classify = function(str) {
  return str.replace(classifyRE, toUpper);
};

var zip = function() {
  return new Promise(function(resolve, reject) {
    fs.readFile('dist/' + pack.name + '.min.js', function(err, buf) {
      if (err) return reject(err);
      zlib.gzip(buf, function(err, buf) {
        if (err) return reject(err);
        write('dist/' + pack.name + '.min.js.gz', buf).then(resolve);
      });
    });
  });
};

var write = function(dest, code) {
  return new Promise(function(resolve, reject) {
    fs.writeFile(dest, code, function(err) {
      if (err) return reject(err);
      resolve();
    });
  });
};

var packageRollup = function(options) {
  return rollup({
    entry: 'src/sweetalert2.js'
  })
  .then(function(bundle) {
    var code = bundle.generate({
      format: options.format,
      banner: banner,
      moduleName: classify(pack.name)
    }).code.replace(/sweetAlert\.version = '(.*)'/, "sweetAlert.version = '" + pack.version + "'");

    if (options.minify) {
      code = uglify.minify(code, {
        fromString: true
      }).code;
    }
    return write(options.dest, code);
  });
};

module.exports = {
  packageRollup: packageRollup,
  write: write,
  zip: zip,
  classify: classify,
  toUpper: toUpper
};