built-init.js

const shellJS = require('shelljs');
const fs = require('fs');
const { REPO_BRANCH, REPO_LINK } = require('./constants');
const fsExtra = require('fs-extra');
const URL = REPO_LINK + '.git';
const path = __dirname + '/src/nb/NativeBase';
var clone = false;

try {
 

  if (fs.existsSync(path)) {
    fs.readdir(path, function(err, data) {
      if (data.length !== 0) {
        console.log(" folder contains files")
        shellJS.cd(path);
        shellJS.exec('git checkout ' + REPO_BRANCH);
        shellJS.exec('git pull origin ' + REPO_BRANCH);
      } 
      else
        {
          clone = true;
          console.log('cloning...')
          const PARENTFOLDER = __dirname + '/src/nb';
          shellJS.cd(PARENTFOLDER);
          shellJS.exec('git clone ' + URL);
      }
    });
  }
  else
    console.log(`Your diectory does't conatins nb/NativeBase folder. Please create one.`);
  
  

  const componentsPath =
    __dirname + '/src/nb/NativeBase/example/storybook/stories/components';
  const basicComponentsPath = __dirname + '/src/nb/components';
  fs.rmdir(basicComponentsPath, { recursive: true }, (err) => {
    if (err) {
      throw err;
    }
    console.log(`deleted!`);
    fs.mkdir(basicComponentsPath, (err) => {
      if (err) throw err;

      fsExtra.copy(componentsPath, basicComponentsPath, (err) => {
        if (err) {
          console.log('Error occurred');
          return;
        }
        console.log('Copy completed');
      });
    });
  });
} catch (err) {
  console.error(err);
}