gulpfile.js

const gulp = require("gulp");
const ts = require("gulp-typescript");

const sourcemaps = require('gulp-sourcemaps');
const nodemon = require('gulp-nodemon');
const watch = require('gulp-watch');
const minify = require('gulp-minify');
const replace = require('gulp-replace');

const fs = require('fs')
const paths = {
    pages: ['src/nodes/*.html'],
    src: 'src',
    dist: 'dist'
};

function copyResources() {
    const tsProjectresources = ts.createProject("tsconfig-resources.json");
    return tsProjectresources.src()
        .pipe(sourcemaps.init())
        .pipe(tsProjectresources())
        .js
        .pipe(gulp.dest('resources'));
}

function copyHtml() {
    const prepareIcalEvents = fs.readFileSync('./resources/prepareIcalEvents.js', 'utf8');
    const config = fs.readFileSync('./resources/config.js', 'utf8');
    const timezones = fs.readFileSync('./resources/timezones.js', 'utf8');
    const template = fs.readFileSync('./src/resources/template.html', 'utf8');
    return gulp.src('src/nodes/*.html', { base: 'src/nodes' })
        .pipe(replace('<!-- template.html -->', template))
        .pipe(replace('{ { prepareIcalEvents } }', prepareIcalEvents))
        .pipe(replace('{ { icalEventsConfig } }', config))
        .pipe(replace('{ { icalEventsTimezones } }', timezones))
        .pipe(gulp.dest(paths.dist));
}

gulp.task("copy-html", copyHtml);
gulp.task("copy-resources", copyResources);

gulp.task('develop', function (done) {
    const stream = nodemon({
        legacyWatch: true,
        exec: 'node --inspect=9229 --preserve-symlinks      --experimental-modules       --trace-warnings  ' + (process.env.NODE_RED_JS ? process.env.NODE_RED_JS : '/usr/lib/node_modules/node-red/red.js'),
        ext: '*.js',
        watch: [paths.dist],
        ignore: ["*.map"],
        done: done,
        verbose: true,
        delay: 2000,
        env: { "NO_UPDATE_NOTIFIER": "1" }
    });

    copyResources();
    copyHtml();
    const tsProject = ts.createProject("tsconfig.json");
    const tsProjectresources = ts.createProject("tsconfig-resources.json");

    tsProjectresources.src()
        .pipe(sourcemaps.init())
        .pipe(tsProjectresources())
        .js
        .pipe(sourcemaps.write('.'))
        .pipe(gulp.dest('resources'));

    tsProject.src()
        .pipe(sourcemaps.init())
        .pipe(tsProject())
        .js
        .pipe(sourcemaps.write('.'))
        .pipe(gulp.dest(paths.dist));

    watch(paths.pages).on('change', () => {

        copyHtml();
        stream.emit('restart', 10)
    });

    watch('src/resources/*.html').on('change', () => {

        copyHtml();
        stream.emit('restart', 10)
    });

    watch('src/**/*.ts').on('change', () => {
        gulp.series(() => {
            tsProjectresources.src()
                .pipe(sourcemaps.init())
                .pipe(tsProjectresources())
                .js
                .pipe(sourcemaps.write('.'))
                .pipe(gulp.dest('resources'));
        }, () => {
            tsProject.src()
                .pipe(sourcemaps.init())
                .pipe(tsProject())
                .js
                .pipe(sourcemaps.write('.'))
                .pipe(gulp.dest(paths.dist));
        })
        stream.emit('restart', 10)
    });

    stream
        .on('restart', function () {
            console.log('restarted!')
        })
        .on('crash', function () {
            console.error('Application has crashed!\n')
            stream.emit('restart', 10)  // restart the server in 10 seconds
        })
})

gulp.task("default",
    gulp.series('copy-resources', 'copy-html',
        () => {
            const tsProject = ts.createProject("tsconfig.json");
            return tsProject.src()
                .pipe(tsProject())
                .js
                .pipe(minify({
                    ext: {
                        min: '.js' // Set the file extension for minified files to just .js
                    },
                    noSource: true // Don’t output a copy of the source file
                }))
                .pipe(gulp.dest(paths.dist));
        })
);