Answer by Alexander Dischberg for How to Gulp-Watch Multiple files?

As of gulp 4, these are two possibilities:

const { watch, series, parallel } = require('gulp');function watchTask(cb) {  // this will execute all task on any changes  watch(['src/**/*'],    series(parallel(jsTask, htmlTask, assetTask),  ));  // this will run specific task based on file type or folder  watch(['src/**/*.js'], series(jsTask));  watch(['src/**/*.html'], series(htmlTask));  watch(['assets/**/*'], series(assetTask));}exports.default = series(parallel(jsTask, htmlTask, assetTask), watchTask);