text: const fs = require('fs');
  const path = require('path');
  
  const envsPath = "src/environments";
  const envMockDev = path.join(envsPath,'environment.mock_dev.ts');
  const envMockProd = path.join(envsPath,'environment.mock_prod.ts');
  const envDev = path.join(envsPath,'environment.ts');
  const envProd = path.join(envsPath,'environment.prod.ts');
  
  fs.createReadStream(envMockDev)
      .pipe(fs.createWriteStream(envDev));
  
  fs.createReadStream(envMockProd)
      .pipe(fs.createWriteStream(envProd));
  