Sub-Store/backend/gulpfile.babel.js

import fs from 'fs';
import browserify from 'browserify';
import gulp from 'gulp';
import prettier from 'gulp-prettier';
import header from 'gulp-header';
import eslint from 'gulp-eslint-new';

import pkg from './package.json';

export function lint() {
	return gulp
		.src('src/**/*.js')
		.pipe(eslint({ fix: true }))
		.pipe(eslint.fix())
		.pipe(eslint.format())
		.pipe(eslint.failAfterError());
}

export function styles() {
	return gulp
		.src('src/**/*.js')
		.pipe(
			prettier({
				singleQuote: true,
				trailingComma: 'all',
				tabWidth: 4,
				bracketSpacing: true
			})
		)
		.pipe(gulp.dest((file) => file.base));
}

function scripts(src, dest) {
	return () => {
		return browserify(src)
			.transform('babelify', {
				presets: [ [ '@babel/preset-env' ] ]
			})
			.plugin('tinyify')
			.bundle()
			.pipe(fs.createWriteStream(dest));
	};
}

function banner(dest) {
	return () => gulp
			.src(dest)
			.pipe(header(fs.readFileSync('./banner', 'utf-8'), { pkg, updated: new Date().toLocaleString() }))
			.pipe(gulp.dest((file) => file.base));
}

const artifacts = [
	{ src: 'src/main.js', dest: 'sub-store.min.js' },
	{ src: 'src/products/resource-parser.loon.js', dest: 'dist/sub-store-parser.loon.min.js'}
]

export const build = gulp.series(
	gulp.parallel(artifacts.map(artifact => scripts(artifact.src, artifact.dest))),
	gulp.parallel(artifacts.map(artifact => banner(artifact.dest)))
);

const all = gulp.series(
	lint,
	styles,
	build
)

export default all;