gulp build step

1.yarn init -y initialization -------> file generated package.json

 

2.yarn add gulp ------> file generated node_modules

3. New gulpfile.js file

　　Gulp defined task in the new version which has the following syntax

function a() {
　　return console.log("abc");
}
　exports.default = series(a)

　　Execution gulp results abc, but if directly gulp a is not performed. That has become a private property, if you want to perform, you must export a = a, then calls

　　series is a serial, parallel performed in parallel

4. Create a directory