gulpfile.js

const gulp = require('gulp');
const minify = require('gulp-minify');
const preprocess = require('gulp-preprocess');
const prettyData = require('gulp-pretty-data');
const clean = require('gulp-clean');
const newer = require('gulp-newer');
const ts = require('gulp-typescript');

const tsProject = ts.createProject('tsconfig.json');

const configuredExtensions = [];

gulp.task('js', () => {
	configuredExtensions.push('js');
	return gulp
		.src([
			'src/**/*.js',
			'!src/**/node_modules/',
			'!src/**/node_modules/**/*'
		])
		.pipe(newer('bin'))
		.pipe(preprocess())
		.pipe(
			minify({
				ext: {
					min: '.js'
				},
				noSource: true
			})
		)
		.pipe(gulp.dest('bin'));
});

gulp.task('ts', () => {
	configuredExtensions.push('ts');
	return gulp
		.src([
			'src/**/*.ts',
			'!src/**/node_modules/',
			'!src/**/node_modules/**/*'
		])
		.pipe(newer('bin'))
		.pipe(preprocess())
		.pipe(tsProject())
		.pipe(
			minify({
				ext: {
					min: '.js'
				},
				noSource: true
			})
		)
		.pipe(gulp.dest('bin'));
});

gulp.task('images', () => {
	configuredExtensions.push('png');
	configuredExtensions.push('jpg');
	configuredExtensions.push('jpeg');
	configuredExtensions.push('gif');
	configuredExtensions.push('tif');
	return gulp
		.src([
			'src/**/*.{png,jpg,jpeg,gif,tif}',
			'!src/**/node_modules/',
			'!src/**/node_modules/**/*'
		])
		.pipe(newer('bin'))
		.pipe(gulp.dest('bin'));
});

gulp.task('pretty-data', () => {
	configuredExtensions.push('xml');
	configuredExtensions.push('json');
	configuredExtensions.push('xlf');
	configuredExtensions.push('svg');
	return gulp
		.src([
			'src/**/*.{xml,json,xlf,svg}',
			'!src/**/node_modules/',
			'!src/**/node_modules/**/*'
		])
		.pipe(newer('bin'))
		.pipe(
			prettyData({
				type: 'minify',
				preserveComments: false
			})
		)
		.pipe(gulp.dest('bin'));
});

gulp.task('copy', () => {
	return gulp
		.src([
			'src/**/*',
			`!src/**/*.{${configuredExtensions.join(',')}}`,
			'!src/**/node_modules/',
			'!src/**/node_modules/**/*'
		])
		.pipe(newer('bin'))
		.pipe(gulp.dest('bin'));
});

gulp.task('clean', () => {
	return gulp.src('bin').pipe(clean());
});

gulp.task(
	'default',
	gulp.parallel('js', 'ts', 'images', 'pretty-data', 'copy')
);
gulp.task('build', gulp.series('default'));
gulp.task('rebuild', gulp.series('clean', 'default'));