refactor gulp tasks, update all gulp dependencies #2122

5 files changed, 3515 insertions, 3842 deletions

diff --git a/css/reveal.css b/css/reveal.css
index 34ace93..99bf47a 100644
--- a/css/reveal.css
+++ b/css/reveal.css
@@ -1,1666 +1,8 @@
 /*!
- * reveal.js
- * http://revealjs.com
- * MIT licensed
- *
- * Copyright (C) 2020 Hakim El Hattab, http://hakim.se
- */
-/*********************************************
- * GLOBAL STYLES
- *********************************************/
-html {
-  width: 100%;
-  height: 100%;
-  height: 100vh;
-  height: calc( var(--vh, 1vh) * 100);
-  overflow: hidden; }
-
-body {
-  height: 100%;
-  overflow: hidden;
-  position: relative;
-  line-height: 1;
-  margin: 0;
-  background-color: #fff;
-  color: #000; }
-
-/*********************************************
- * VIEW FRAGMENTS
- *********************************************/
-.reveal .slides section .fragment {
-  opacity: 0;
-  visibility: hidden;
-  transition: all .2s ease; }
-  .reveal .slides section .fragment.visible {
-    opacity: 1;
-    visibility: inherit; }
-
-.reveal .slides section .fragment.grow {
-  opacity: 1;
-  visibility: inherit; }
-  .reveal .slides section .fragment.grow.visible {
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-            transform: scale(1.3); }
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-.reveal .slides section .fragment.shrink {
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-  .reveal .slides section .fragment.shrink.visible {
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-            transform: scale(0.7); }
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-.reveal .slides section .fragment.zoom-in {
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-.reveal .slides section .fragment.fade-out {
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-.reveal .slides section .fragment.semi-fade-out {
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-.reveal .slides section .fragment.fade-left {
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-  .reveal .slides section .fragment.fade-left.visible {
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-.reveal .slides section .fragment.fade-in-then-out,
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-.reveal .slides section .fragment.highlight-red,
-.reveal .slides section .fragment.highlight-current-red,
-.reveal .slides section .fragment.highlight-green,
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-
-/*********************************************
- * DEFAULT ELEMENT STYLES
- *********************************************/
-/* Fixes issue in Chrome where italic fonts did not appear when printing to PDF */
-.reveal:after {
-  content: '';
-  font-style: italic; }
-
-.reveal iframe {
-  z-index: 1; }
-
-/** Prevents layering issues in certain browser/transition combinations */
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-.reveal .stretch {
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-.reveal pre.stretch code {
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-/*********************************************
- * CONTROLS
- *********************************************/
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-  20% {
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-  30% {
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-  30% {
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-            transform: translateY(-5px); } }
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-            transform: translateY(10px); }
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-    -webkit-transform: translateY(-5px);
-            transform: translateY(-5px); } }
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-.reveal .controls {
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-  z-index: 11;
-  color: #000;
-  pointer-events: none;
-  font-size: 10px; }
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-    padding: 0;
-    background-color: transparent;
-    border: 0;
-    outline: 0;
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-    color: currentColor;
-    -webkit-transform: scale(0.9999);
-            transform: scale(0.9999);
-    transition: color 0.2s ease, opacity 0.2s ease, -webkit-transform 0.2s ease;
-    transition: color 0.2s ease, opacity 0.2s ease, transform 0.2s ease;
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-    font-size: inherit;
-    visibility: hidden;
-    opacity: 0;
-    -webkit-appearance: none;
-    -webkit-tap-highlight-color: rgba(0, 0, 0, 0); }
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-    content: '';
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-    top: 0;
-    left: 0;
-    width: 2.6em;
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-              animation: bounce-left 2s 50 both ease-out; }
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-@media screen and (min-width: 500px) {
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-/*********************************************
- * PROGRESS BAR
- *********************************************/
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-/*********************************************
- * SLIDE NUMBER
- *********************************************/
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-/*********************************************
- * SLIDES
- *********************************************/
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-/*********************************************
- * Mixins for readability of transitions
- *********************************************/
-/*********************************************
- * SLIDE TRANSITION
- * Aliased 'linear' for backwards compatibility
- *********************************************/
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diff --git a/css/reveal.scss b/css/reveal.scss
index 2bb7656..ce6b220 100644
--- a/css/reveal.scss
+++ b/css/reveal.scss
@@ -1,9 +1,9 @@
-/*!
+/**
  * reveal.js
  * http://revealjs.com
  * MIT licensed
  *
- * Copyright (C) 2020 Hakim El Hattab, http://hakim.se
+ * Copyright (C) Hakim El Hattab, https://hakim.se
  */
 
 
diff --git a/gulpfile.js b/gulpfile.js
new file mode 100644
index 0000000..6967bbb
--- /dev/null
+++ b/gulpfile.js
@@ -0,0 +1,85 @@
+const gulp = require('gulp')
+const zip = require('gulp-zip')
+const sass = require('gulp-sass')
+const qunit = require('gulp-qunit')
+const header = require('gulp-header')
+const eslint = require('gulp-eslint')
+const uglify = require('gulp-uglify')
+const rename = require('gulp-rename')
+const minify = require('gulp-clean-css')
+const connect = require('gulp-connect')
+const autoprefixer = require('gulp-autoprefixer')
+const pkg = require('./package.json')
+
+const license = `/*!
+* reveal.js <%= pkg.version %> (<%= new Date().toDateString() %>)
+* <%= pkg.homepage %>
+* MIT licensed
+*
+* Copyright (C) 2020 Hakim El Hattab, https://hakim.se
+*/\n`
+
+gulp.task('js', () => gulp.src(['./js/reveal.js'])
+        .pipe(uglify())
+        .pipe(header(license, {pkg: pkg}))
+        .pipe(rename('reveal.min.js'))
+        .pipe(gulp.dest('./js')))
+
+gulp.task('css-themes', () => gulp.src(['./css/theme/source/*.{sass,scss}'])
+        .pipe(sass())
+        .pipe(gulp.dest('./css/theme')))
+
+gulp.task('css-core', gulp.series(
+
+    () => gulp.src(['css/reveal.scss']).pipe(sass()).pipe(autoprefixer()).pipe(gulp.dest('./css')),
+    () => gulp.src(['css/reveal.css']).pipe(minify({
+        compatibility: 'ie9'
+    })).pipe(header(license, {pkg: pkg}))
+       .pipe(gulp.dest('./css'))
+
+))
+
+gulp.task('css', gulp.parallel('css-themes', 'css-core'))
+
+gulp.task('test', gulp.series(
+
+    () => gulp.src(['./js/reveal.js']).pipe(eslint()).pipe(eslint.format()),
+    () => gulp.src(['./test/*.html']).pipe(qunit())
+
+))
+
+gulp.task('default', gulp.series(gulp.parallel('js', 'css'), 'test'))
+
+gulp.task('package', gulp.series('default', () =>
+
+    gulp.src([
+        './index.html',
+        './css/**',
+        './js/**',
+        './lib/**',
+        './images/**',
+        './plugin/**',
+        './**.md'
+    ]).pipe(zip('reveal-js-presentation.zip')).pipe(gulp.dest('./'))
+
+))
+
+gulp.task('serve', () => {
+
+    connect.server({
+        root: '.',
+        livereload: true,
+        open: true,
+        useAvailablePort: true
+    })
+
+    gulp.watch(['js/reveal.js'], gulp.series('js'))
+
+    gulp.watch([
+        'css/theme/source/*.{sass,scss}',
+        'css/theme/template/*.{sass,scss}',
+    ], gulp.series('css-themes'))
+
+    gulp.watch(['css/reveal.scss'], gulp.series('css-core'))
+
+})
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index a1ec366..6b07590 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,58 +4,70 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+      "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.8.3"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
+      "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+      "dev": true
+    },
     "abbrev": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
-      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
       "dev": true
     },
     "accepts": {
-      "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
-      "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
       "dev": true,
       "requires": {
-        "mime-types": "~2.1.18",
-        "negotiator": "0.6.1"
-      },
-      "dependencies": {
-        "mime-db": {
-          "version": "1.38.0",
-          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.38.0.tgz",
-          "integrity": "sha512-bqVioMFFzc2awcdJZIzR3HjZFX20QhilVS7hytkKrv7xFAn8bM1gzc/FOX2awLISvWe0PV8ptFKcon+wZ5qYkg==",
-          "dev": true
-        },
-        "mime-types": {
-          "version": "2.1.22",
-          "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.22.tgz",
-          "integrity": "sha512-aGl6TZGnhm/li6F7yx82bJiBZwgiEa4Hf6CNr8YO+r5UHr53tSTYZb102zyU50DOWWKeOv0uQLRL0/9EiKWCog==",
-          "dev": true,
-          "requires": {
-            "mime-db": "~1.38.0"
-          }
-        }
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
       }
     },
+    "acorn": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
+      "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
+      "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
+      "dev": true
+    },
     "after": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
       "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8=",
       "dev": true
     },
-    "agent-base": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
-      "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
-      "dev": true,
-      "requires": {
-        "es6-promisify": "^5.0.0"
-      }
-    },
     "ajv": {
-      "version": "6.11.0",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.11.0.tgz",
-      "integrity": "sha512-nCprB/0syFYy9fVYU1ox1l2KN8S9I+tziH8D4zdZuLT3N6RMlGSGt5FSTpAiHB/Whv8Qs1cWHma1aMKZyaHRKA==",
+      "version": "6.12.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.0.tgz",
+      "integrity": "sha512-D6gFiFA0RRLyUbvijN74DWAjXSFxWKaWP7mldxkVhyhAV3+SWA9HEJPHQ2c9soIeTFJqcSdFDGFgdqs1iUU2Hw==",
       "dev": true,
       "requires": {
         "fast-deep-equal": "^3.1.1",
@@ -70,6 +82,41 @@
       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
       "dev": true
     },
+    "ansi-colors": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-1.1.0.tgz",
+      "integrity": "sha512-SFKX67auSNoVR38N3L+nvsPjOE0bybKTYbkf5tRvushrAPQ9V75huw0ZxBkKVeRU9kqH3d6HA4xTckbwZ4ixmA==",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "^0.1.0"
+      }
+    },
+    "ansi-escapes": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
+      "integrity": "sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==",
+      "dev": true,
+      "requires": {
+        "type-fest": "^0.11.0"
+      },
+      "dependencies": {
+        "type-fest": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
+          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
+          "dev": true
+        }
+      }
+    },
+    "ansi-gray": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-gray/-/ansi-gray-0.1.1.tgz",
+      "integrity": "sha1-KWLPVOyXksSFEKPetSRDaGHvclE=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -77,17 +124,51 @@
       "dev": true
     },
     "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
+    },
+    "ansi-wrap": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-wrap/-/ansi-wrap-0.1.0.tgz",
+      "integrity": "sha1-qCJQ3bABXponyoLoLqYDu/pF768=",
       "dev": true
     },
+    "anymatch": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
+      "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
+      "dev": true,
+      "requires": {
+        "micromatch": "^3.1.4",
+        "normalize-path": "^2.1.1"
+      }
+    },
+    "append-buffer": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/append-buffer/-/append-buffer-1.0.2.tgz",
+      "integrity": "sha1-2CIM9GYIFSXv6lBhTz3mUU36WPE=",
+      "dev": true,
+      "requires": {
+        "buffer-equal": "^1.0.0"
+      }
+    },
     "aproba": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
       "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
       "dev": true
     },
+    "archy": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
+      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
+      "dev": true
+    },
     "are-we-there-yet": {
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
@@ -105,14 +186,6 @@
       "dev": true,
       "requires": {
         "sprintf-js": "~1.0.2"
-      },
-      "dependencies": {
-        "sprintf-js": {
-          "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-          "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
-          "dev": true
-        }
       }
     },
     "arr-diff": {
@@ -121,24 +194,36 @@
       "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
       "dev": true
     },
+    "arr-filter": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/arr-filter/-/arr-filter-1.1.2.tgz",
+      "integrity": "sha1-Q/3d0JHo7xGqTEXZzcGOLf8XEe4=",
+      "dev": true,
+      "requires": {
+        "make-iterator": "^1.0.0"
+      }
+    },
     "arr-flatten": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
+    "arr-map": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/arr-map/-/arr-map-2.0.2.tgz",
+      "integrity": "sha1-Onc0X/wc814qkYJWAfnljy4kysQ=",
+      "dev": true,
+      "requires": {
+        "make-iterator": "^1.0.0"
+      }
+    },
     "arr-union": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
       "dev": true
     },
-    "array-differ": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz",
-      "integrity": "sha1-7/UuN1gknTO+QCuLuOVkuytdQDE=",
-      "dev": true
-    },
     "array-each": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
@@ -157,27 +242,66 @@
       "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
       "dev": true
     },
+    "array-initial": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/array-initial/-/array-initial-1.1.0.tgz",
+      "integrity": "sha1-L6dLJnOTccOUe9enrcc74zSz15U=",
+      "dev": true,
+      "requires": {
+        "array-slice": "^1.0.0",
+        "is-number": "^4.0.0"
+      },
+      "dependencies": {
+        "is-number": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-4.0.0.tgz",
+          "integrity": "sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==",
+          "dev": true
+        }
+      }
+    },
+    "array-last": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/array-last/-/array-last-1.3.0.tgz",
+      "integrity": "sha512-eOCut5rXlI6aCOS7Z7kCplKRKyiFQ6dHFBem4PwlwKeNFk2/XxTrhRh5T9PyaEWGy/NHTZWbY+nsZlNFJu9rYg==",
+      "dev": true,
+      "requires": {
+        "is-number": "^4.0.0"
+      },
+      "dependencies": {
+        "is-number": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-4.0.0.tgz",
+          "integrity": "sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==",
+          "dev": true
+        }
+      }
+    },
     "array-slice": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
       "integrity": "sha512-B1qMD3RBP7O8o0H2KbrXDyB0IccejMF15+87Lvlor12ONPRHP6gTjXMNkt/d3ZuOGbAe66hFmaCfECI24Ufp6w==",
       "dev": true
     },
-    "array-union": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
-      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+    "array-sort": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-sort/-/array-sort-1.0.0.tgz",
+      "integrity": "sha512-ihLeJkonmdiAsD7vpgN3CRcx2J2S0TiYW+IS/5zHBI7mKUq3ySvBdzzBfD236ubDBQFiiyG3SWCPc+msQ9KoYg==",
       "dev": true,
       "requires": {
-        "array-uniq": "^1.0.1"
+        "default-compare": "^1.0.0",
+        "get-value": "^2.0.6",
+        "kind-of": "^5.0.2"
+      },
+      "dependencies": {
+        "kind-of": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-5.1.0.tgz",
+          "integrity": "sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==",
+          "dev": true
+        }
       }
     },
-    "array-uniq": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
-      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
-      "dev": true
-    },
     "array-unique": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
@@ -190,12 +314,6 @@
       "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog==",
       "dev": true
     },
-    "arrify": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
-      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
-      "dev": true
-    },
     "asn1": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
@@ -205,15 +323,6 @@
         "safer-buffer": "~2.1.0"
       }
     },
-    "assert": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/assert/-/assert-1.4.1.tgz",
-      "integrity": "sha1-mZEtWRg2tab1s0XA8H7vwI/GXZE=",
-      "dev": true,
-      "requires": {
-        "util": "0.10.3"
-      }
-    },
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
@@ -226,10 +335,28 @@
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
-    "async": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
-      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
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@@ -5502,13 +6694,77 @@
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+        "http-parser-js": ">=0.4.0 <0.4.11",
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@@ -5605,6 +6798,12 @@
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+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
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@@ -5621,15 +6820,21 @@
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+    "write": {
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+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
       "dev": true,
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-        "async-limiter": "~1.0.0"
+        "mkdirp": "^0.5.1"
       }
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+    "ws": {
+      "version": "7.2.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.1.tgz",
+      "integrity": "sha512-sucePNSafamSKoOqoNfBd8V0StlkzJKL2ZAhGQinCfNQ+oacw+Pk7lcdAElecBF2VkLNZRiIb5Oi1Q5lVUVt2A==",
+      "dev": true
+    },
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@@ -5637,9 +6842,9 @@
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-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
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@@ -5693,6 +6898,15 @@
         "fd-slicer": "~1.0.1"
       }
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+    "yazl": {
+      "version": "2.5.1",
+      "resolved": "https://registry.npmjs.org/yazl/-/yazl-2.5.1.tgz",
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+      "dev": true,
+      "requires": {
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diff --git a/package.json b/package.json
index 07b6089..0df33ba 100644
--- a/package.json
+++ b/package.json
@@ -2,18 +2,19 @@
   "name": "reveal.js",
   "version": "4.0.0-dev",
   "description": "The HTML Presentation Framework",
-  "homepage": "http://revealjs.com",
+  "homepage": "https://revealjs.com",
   "subdomain": "revealjs",
   "main": "js/reveal.js",
+  "license": "MIT",
   "scripts": {
-    "test": "grunt test",
-    "start": "grunt serve",
-    "build": "grunt"
+    "test": "gulp test",
+    "start": "gulp serve",
+    "build": "gulp"
   },
   "author": {
     "name": "Hakim El Hattab",
     "email": "hakim.elhattab@gmail.com",
-    "web": "http://hakim.se"
+    "web": "https://hakim.se"
   },
   "repository": {
     "type": "git",
@@ -23,22 +24,53 @@
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-    "mustache": "^2.3.0",
-    "node-sass": "^4.13.1",
-    "socket.io": "^2.2.0"
+    "gulp": "^4.0.2",
+    "gulp-autoprefixer": "^7.0.1",
+    "gulp-clean-css": "^4.2.0",
+    "gulp-connect": "^5.7.0",
+    "gulp-eslint": "^6.0.0",
+    "gulp-qunit": "^2.1.1",
+    "gulp-rename": "^2.0.0",
+    "gulp-sass": "^4.0.2",
+    "gulp-uglify": "^3.0.2",
+    "gulp-header": "^2.0.9",
+    "gulp-zip": "^5.0.1",
+    "express": "^4.17.1",
+    "mustache": "^4.0.0",
+    "socket.io": "^2.3.0"
   },
-  "license": "MIT"
+  "eslintConfig": {
+    "env": {
+      "browser": true
+    },
+    "globals": {
+      "head": false,
+      "module": false,
+      "console": false,
+      "unescape": false,
+      "define": false,
+      "exports": false
+    },
+    "rules": {
+      "curly": 0,
+      "eqeqeq": 2,
+      "no-unused-expressions": [2, { "allowShortCircuit": true, "allowTernary": true }],
+      "wrap-iife": [
+        2,
+        "any"
+      ],
+      "no-use-before-define": [
+        2,
+        {
+          "functions": false
+        }
+      ],
+      "new-cap": 2,
+      "no-caller": 2,
+      "dot-notation": 0,
+      "no-undef": 2,
+      "no-eq-null": 2,
+      "no-unused-expressions": 2
+    }
+  }
 }