npm installnpm install gulp -gnpm install gulp-cli -g- if you have any error like
Error: Cannot find module 'array-union'not found please Googlepackage nameand installpackage nameto fix error likenpm install array-union
npm installnpm install gulp -gnpm install gulp-cli -gError: Cannot find module 'array-union' not found please Google package name and install package name to fix error like npm install array-union