gulpfile.js

const pkg = require('./package.json')
const path = require('path')
const glob = require('glob')
const yargs = require('yargs')
const colors = require('colors')
const qunit = require('node-qunit-puppeteer')

const {rollup} = require('rollup')
const {terser} = require('rollup-plugin-terser')
const babel = require('@rollup/plugin-babel').default
const commonjs = require('@rollup/plugin-commonjs')
const resolve = require('@rollup/plugin-node-resolve').default

const gulp = require('gulp')
const tap = require('gulp-tap')
const zip = require('gulp-zip')
const sass = require('gulp-sass')
const header = require('gulp-header')
const eslint = require('gulp-eslint')
const minify = require('gulp-clean-css')
const connect = require('gulp-connect')
const autoprefixer = require('gulp-autoprefixer')

const root = yargs.argv.root || '.'
const port = yargs.argv.port || 8000

const banner = `/*!
* reveal.js ${pkg.version}
* ${pkg.homepage}
* MIT licensed
*
* Copyright (C) 2020 Hakim El Hattab, https://hakim.se
*/\n`

// Prevents warnings from opening too many test pages
process.setMaxListeners(20);

const babelConfig = {
    babelHelpers: 'bundled',
    ignore: ['node_modules'],
    compact: false,
    extensions: ['.js', '.html'],
    plugins: [
        'transform-html-import-to-string'
    ],
    presets: [[
        '@babel/preset-env',
        {
            corejs: 3,
            useBuiltIns: 'usage',
            modules: false
        }
    ]]
};

// Our ES module bundle only targets newer browsers with
// module support. Browsers are targeted explicitly instead
// of using the "esmodule: true" target since that leads to
// polyfilling older browsers and a larger bundle.
const babelConfigESM = JSON.parse( JSON.stringify( babelConfig ) );
babelConfigESM.presets[0][1].targets = { browsers: [
    'last 2 Chrome versions', 'not Chrome < 60',
    'last 2 Safari versions', 'not Safari < 10.1',
    'last 2 iOS versions', 'not iOS < 10.3',
    'last 2 Firefox versions', 'not Firefox < 60',
    'last 2 Edge versions', 'not Edge < 16',
] };

gulp.task('css-themes', () => gulp.src(['./css/theme/source/*.{sass,scss}'])
        .pipe(sass())
        .pipe(gulp.dest('./dist/theme')))