bootswatchからサムネイルを取得してリサイズするGulpタスク

gulpfile.js

const gulp = require('gulp');
const imageResize = require('gulp-image-resize');
const remoteSrc = require('gulp-remote-src');

const bootstrapThemes = [
	'Cerulean',
	'Cosmo',
	'Cyborg',
	'Darkly',
	'Flatly',
	'Journal',
	'Lumen',
	'Paper',
	'Readable',
	'Sandstone',
	'Simplex',
	'Slate',
	'Spacelab',
	'Superhero',
	'United',
	'Yeti'
].map((theme) => theme.toLowerCase());

gulp.task('bootswatch', () => {
	bootstrapThemes.map((theme) => {
		remoteSrc(['thumbnail.png'], {
				base: `https://bootswatch.com/${theme}/`
			})
			.pipe(imageResize({
				width: 350
			}))
			.pipe(rename(`${theme}.png`))
			.pipe(gulp.dest('thumbnails'))
	});
});