upgrade to gulp 5.0, latest sass, & node-qunit-puppeteer #3608

gulpfile.js

@@ -12,9 +12,8 @@ const resolve = require('@rollup/plugin-node-resolve').default
 const sass = require('sass')
 
 const gulp = require('gulp')
-const tap = require('gulp-tap')
 const zip = require('gulp-zip')
-const header = require('gulp-header')
+const header = require('gulp-header-comment')
 const eslint = require('gulp-eslint')
 const minify = require('gulp-clean-css')
 const connect = require('gulp-connect')
@@ -24,13 +23,21 @@ const root = yargs.argv.root || '.'
 const port = yargs.argv.port || 8000
 const host = yargs.argv.host || 'localhost'
 
-const banner = `/*!
-* reveal.js ${pkg.version}
-* ${pkg.homepage}
-* MIT licensed
-*
-* Copyright (C) 2011-2024 Hakim El Hattab, https://hakim.se
-*/\n`
+const cssLicense = `
+reveal.js ${pkg.version}
+${pkg.homepage}
+MIT licensed
+
+Copyright (C) 2011-2024 Hakim El Hattab, https://hakim.se
+`;
+
+const jsLicense = `/*!
+ * reveal.js ${pkg.version}
+ * ${pkg.homepage}
+ * MIT licensed
+ *
+ * Copyright (C) 2011-2024 Hakim El Hattab, https://hakim.se
+ */\n`;
 
 // Prevents warnings from opening too many test pages
 process.setMaxListeners(20);
@@ -86,7 +93,7 @@ gulp.task('js-es5', () => {
             name: 'Reveal',
             file: './dist/reveal.js',
             format: 'umd',
-            banner: banner,
+            banner: jsLicense,
             sourcemap: true
         });
     });
@@ -108,7 +115,7 @@ gulp.task('js-es6', () => {
         return bundle.write({
             file: './dist/reveal.esm.js',
             format: 'es',
-            banner: banner,
+            banner: jsLicense,
             sourcemap: true
         });
     });
@@ -161,6 +168,7 @@ function compileSass() {
     const transformedFile = vinylFile.clone();
 
     sass.render({
+        silenceDeprecations: ['legacy-js-api'],
         data: transformedFile.contents.toString(),
         file: transformedFile.path,
     }, ( err, result ) => {
@@ -184,7 +192,7 @@ gulp.task('css-core', () => gulp.src(['css/reveal.scss'])
     .pipe(compileSass())
     .pipe(autoprefixer())
     .pipe(minify({compatibility: 'ie9'}))
-    .pipe(header(banner))
+    .pipe(header(cssLicense))
     .pipe(gulp.dest('./dist')))
 
 gulp.task('css', gulp.parallel('css-themes', 'css-core'))