How to use the bitcore-lib.configFile function in bitcore-lib

function(next) {
      console.log('step 0: setting up directories.');
      bitcore.configFile.conf.servicesConfig.header = { slowMode: 1000 };
      var dirs = bitcoinDataDirs.concat([bitcoreDataDir]);
      resetDirs(dirs, function(err) {
        if (err) {
          return next(err);
        }
        writeBitcoreConf();
        next();
      });
    },
    // 1. start fake server

var writeBitcoreConf = function() {
  fs.writeFileSync(bitcore.configFile.file, JSON.stringify(bitcore.configFile.conf));
};

var writeBitcoreConf = function() {
  fs.writeFileSync(bitcore.configFile.file, JSON.stringify(bitcore.configFile.conf));
};

mkdirp(bitcoreDataDir, function(err) {

      if(err) {
        return callback(err);
      }

      fs.writeFileSync(bitcore.configFile.file, JSON.stringify(bitcore.configFile.conf));

      var args = bitcore.args;
      bitcore.process = spawn(bitcore.exec, args, bitcore.opts);

      bitcore.process.stdout.on('data', function(data) {

        if (debug) {
          process.stdout.write(data.toString());
        }

      });
      bitcore.process.stderr.on('data', function(data) {

        if (debug) {
          process.stderr.write(data.toString());
        }

var writeBitcoreConf = function() {
  fs.writeFileSync(bitcore.configFile.file, JSON.stringify(bitcore.configFile.conf));
};

var writeBitcoreConf = function() {
  fs.writeFileSync(bitcore.configFile.file, JSON.stringify(bitcore.configFile.conf));
};

mkdirp(bitcoreDataDir, function(err) {

      if(err) {
        return callback(err);
      }

      fs.writeFileSync(bitcore.configFile.file, JSON.stringify(bitcore.configFile.conf));

      var args = bitcore.args;
      bitcore.process = spawn(bitcore.exec, args, bitcore.opts);

      bitcore.process.stdout.on('data', function(data) {

        if (debug) {
          process.stdout.write(data.toString());
        }

      });

      bitcore.process.stderr.on('data', function(data) {

        if (debug) {
          process.stderr.write(data.toString());