gulpfile.js

var gulp = require('gulp')
const terser = require('gulp-terser')
var ts = require('gulp-typescript')
const imagemin = require('gulp-imagemin')

var tsProject = ts.createProject('tsconfig.json')

gulp.task('copy', async function () {
    gulp.src('./src/public/fonts/*').pipe(gulp.dest('./dist/public/fonts'))
    gulp.src('./src/public/stylesheets/*.css').pipe(gulp.dest('./dist/public/stylesheets'))
    gulp.src('./src/views/*.ejs').pipe(gulp.dest('./dist/views'))
})

gulp.task('uglify', async function () {
    gulp.src('./src/public/scripts/*.js').pipe(terser()).pipe(gulp.dest('./dist/public/scripts'))
})

gulp.task('compress-img', async function () {
    gulp.src('./src/public/images/*').pipe(imagemin()).pipe(gulp.dest('./dist/public/images'))
})

gulp.task('ts-compile', function () {
    return tsProject.src().pipe(tsProject()).js.pipe(gulp.dest('dist'))
})

gulp.task('build', gulp.series('copy', 'uglify', 'compress-img', 'ts-compile'))

gulp.task('default', gulp.series('build'))