in my project, I will use the advanced usage of es5 such as String.prototype.includes and Promise. I need to polyfill, these API, but the polyfill resources on the Internet are very large and complete. I just want to generate polyfill.js files according to the API I use. Usually, the construction code likes to use gulp, so I found a gulp plug-in to help generate polyfill.js files. The address is gulp-polyfiller , which can be used to meet the needs, but the project has stopped updating, is there any way to maintain and facilitate us to generate polyfill.js on demand, it is best to match it with gulp.