gulpfile.js

const gulp = require('gulp');
const htmlmin = require('gulp-htmlmin');
const htmlclean = require('gulp-htmlclean');
const version = require('gulp-version-number');
const terser = require('gulp-terser');

// Compress js files
gulp.task('js', function () {
    return gulp.src(['./public/js/main.js'])
        .pipe(terser({
            compress: true
        }))
        .pipe(gulp.dest('./public/js'));
});


// Build html files
gulp.task('html', function () {
    return gulp.src('./public/**/*.html')
        .pipe(htmlclean())
        .pipe(htmlmin({
            removeComments: true,
            minifyJS: true,
            minifyCSS: true,
            minifyURLs: true,
        }))
        .pipe(version({
            'append': {
                'key': '_v',
                'cover': 1,
                'to': ['css', 'js', 'png', 'jpg', 'woff2']
            }
        }))
        .pipe(gulp.dest('./public'));
});

gulp.task('default', gulp.parallel('js', 'html'));