From fa85f8629825cc16550db491b1a95194df1f26c8 Mon Sep 17 00:00:00 2001
From: Tim van der Meij <timvandermeij@gmail.com>
Date: Sun, 18 Nov 2018 18:33:23 +0100
Subject: [PATCH] Upgrade to Gulp 4

This required the following changes in the Gulpfile:

- Defining a series of tasks is no longer done with arrays, but with the
  `gulp.series` function. The `web` target is refactored to use a
  smaller number of tasks to prevent tasks from running multiple times.
- Getting all tasks must now be done through the task registry.
- Tasks that don't return anything must call `done` upon completion.

Moreover, this upgrade allows us to use the latest Node.js on Travis CI
again.
---
 .travis.yml                     |   2 +-
 examples/browserify/gulpfile.js |   2 +-
 gulpfile.js                     | 142 +++---
 package-lock.json               | 857 ++++++++++++++++++--------------
 package.json                    |   2 +-
 5 files changed, 563 insertions(+), 442 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 13cd70d69..0c0c23f89 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "10"
+  - node
 cache:
   directories:
     - node_modules
diff --git a/examples/browserify/gulpfile.js b/examples/browserify/gulpfile.js
index a6230c880..0d382c532 100644
--- a/examples/browserify/gulpfile.js
+++ b/examples/browserify/gulpfile.js
@@ -33,4 +33,4 @@ gulp.task('build-worker', function() {
     .pipe(gulp.dest(OUTPUT_PATH));
 });
 
-gulp.task('build', ['build-bundle', 'build-worker']);
+gulp.task('build', gulp.series('build-bundle', 'build-worker'));
diff --git a/gulpfile.js b/gulpfile.js
index 70d9daca5..685a4d575 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -439,13 +439,14 @@ function makeRef(done, bot) {
   });
 }
 
-gulp.task('default', function() {
+gulp.task('default', function(done) {
   console.log('Available tasks:');
-  var tasks = Object.keys(gulp.tasks);
+  var tasks = Object.keys(gulp.registry().tasks());
   tasks.sort();
   tasks.forEach(function (taskName) {
     console.log('  ' + taskName);
   });
+  done();
 });
 
 gulp.task('buildnumber', function (done) {
@@ -549,7 +550,7 @@ gulp.task('locale', function () {
   ]);
 });
 
-gulp.task('cmaps', function () {
+gulp.task('cmaps', function (done) {
   var CMAP_INPUT = 'external/cmaps';
   var VIEWER_CMAP_OUTPUT = 'external/bcmaps';
 
@@ -573,11 +574,12 @@ gulp.task('cmaps', function () {
   var compressCmaps =
     require('./external/cmapscompress/compress.js').compressCmaps;
   compressCmaps(CMAP_INPUT, VIEWER_CMAP_OUTPUT, true);
+  done();
 });
 
-gulp.task('bundle', ['buildnumber'], function () {
+gulp.task('bundle', gulp.series('buildnumber', function () {
   return createBundle(DEFINES).pipe(gulp.dest(BUILD_DIR));
-});
+}));
 
 function preprocessCSS(source, mode, defines, cleanup) {
   var outName = getTempFile('~preprocess', '.css');
@@ -606,7 +608,7 @@ function preprocessHTML(source, defines) {
 
 // Builds the generic production viewer that should be compatible with most
 // modern HTML5 browsers.
-gulp.task('generic', ['buildnumber', 'locale'], function () {
+gulp.task('generic', gulp.series('buildnumber', 'locale', function () {
   console.log();
   console.log('### Creating generic viewer');
   var defines = builder.merge(DEFINES, { GENERIC: true, });
@@ -635,9 +637,9 @@ gulp.task('generic', ['buildnumber', 'locale'], function () {
     gulp.src('web/compressed.tracemonkey-pldi-09.pdf')
         .pipe(gulp.dest(GENERIC_DIR + 'web')),
   ]);
-});
+}));
 
-gulp.task('components', ['buildnumber'], function () {
+gulp.task('components', gulp.series('buildnumber', function () {
   console.log();
   console.log('### Creating generic components');
   var defines = builder.merge(DEFINES, { COMPONENTS: true, GENERIC: true, });
@@ -658,18 +660,18 @@ gulp.task('components', ['buildnumber'], function () {
         .pipe(postcss([autoprefixer(AUTOPREFIXER_CONFIG)]))
         .pipe(gulp.dest(COMPONENTS_DIR)),
   ]);
-});
+}));
 
-gulp.task('image_decoders', ['buildnumber'], function() {
+gulp.task('image_decoders', gulp.series('buildnumber', function() {
   console.log();
   console.log('### Creating image decoders');
   var defines = builder.merge(DEFINES, { GENERIC: true,
                                          IMAGE_DECODERS: true, });
 
   return createImageDecodersBundle(defines).pipe(gulp.dest(IMAGE_DECODERS_DIR));
-});
+}));
 
-gulp.task('minified-pre', ['buildnumber', 'locale'], function () {
+gulp.task('minified-pre', gulp.series('buildnumber', 'locale', function () {
   console.log();
   console.log('### Creating minified viewer');
   var defines = builder.merge(DEFINES, { MINIFIED: true, GENERIC: true, });
@@ -700,9 +702,9 @@ gulp.task('minified-pre', ['buildnumber', 'locale'], function () {
     gulp.src('web/compressed.tracemonkey-pldi-09.pdf')
         .pipe(gulp.dest(MINIFIED_DIR + 'web')),
   ]);
-});
+}));
 
-gulp.task('minified-post', ['minified-pre'], function () {
+gulp.task('minified-post', gulp.series('minified-pre', function (done) {
   var pdfFile = fs.readFileSync(MINIFIED_DIR + '/build/pdf.js').toString();
   var pdfWorkerFile =
     fs.readFileSync(MINIFIED_DIR + '/build/pdf.worker.js').toString();
@@ -742,9 +744,10 @@ gulp.task('minified-post', ['minified-pre'], function () {
                 MINIFIED_DIR + '/build/pdf.worker.js');
   fs.renameSync(MINIFIED_DIR + '/image_decoders/pdf.image_decoders.min.js',
                 MINIFIED_DIR + '/image_decoders/pdf.image_decoders.js');
-});
+  done();
+}));
 
-gulp.task('minified', ['minified-post']);
+gulp.task('minified', gulp.series('minified-post'));
 
 function preprocessDefaultPreferences(content) {
   var preprocessor2 = require('./external/builder/preprocessor2.js');
@@ -763,7 +766,7 @@ function preprocessDefaultPreferences(content) {
           content + '\n');
 }
 
-gulp.task('mozcentral-pre', ['buildnumber', 'locale'], function () {
+gulp.task('mozcentral-pre', gulp.series('buildnumber', 'locale', function () {
   console.log();
   console.log('### Building mozilla-central extension');
   var defines = builder.merge(DEFINES, { MOZCENTRAL: true, SKIP_BABEL: true, });
@@ -809,11 +812,11 @@ gulp.task('mozcentral-pre', ['buildnumber', 'locale'], function () {
         .pipe(transform('utf8', preprocessDefaultPreferences))
         .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR)),
   ]);
-});
+}));
 
-gulp.task('mozcentral', ['mozcentral-pre']);
+gulp.task('mozcentral', gulp.series('mozcentral-pre'));
 
-gulp.task('chromium-pre', ['buildnumber', 'locale'], function () {
+gulp.task('chromium-pre', gulp.series('buildnumber', 'locale', function () {
   console.log();
   console.log('### Building Chromium extension');
   var defines = builder.merge(DEFINES, { CHROME: true, });
@@ -856,9 +859,9 @@ gulp.task('chromium-pre', ['buildnumber', 'locale'], function () {
     ], { base: 'extensions/chromium/', })
         .pipe(gulp.dest(CHROME_BUILD_DIR)),
   ]);
-});
+}));
 
-gulp.task('chromium', ['chromium-pre']);
+gulp.task('chromium', gulp.series('chromium-pre'));
 
 gulp.task('jsdoc', function (done) {
   console.log();
@@ -880,7 +883,7 @@ gulp.task('jsdoc', function (done) {
   });
 });
 
-gulp.task('lib', ['buildnumber'], function () {
+gulp.task('lib', gulp.series('buildnumber', function () {
   // When we create a bundle, webpack is run on the source and it will replace
   // require with __webpack_require__. When we want to use the real require,
   // __non_webpack_require__ has to be used.
@@ -960,11 +963,9 @@ gulp.task('lib', ['buildnumber'], function () {
     gulp.src('external/url/url-lib.js', { base: '.', })
       .pipe(gulp.dest('build/')),
   ]);
-});
+}));
 
-gulp.task('web-pre', ['generic', 'jsdoc']);
-
-gulp.task('publish', ['generic'], function (done) {
+gulp.task('publish', gulp.series('generic', function (done) {
   var version = JSON.parse(
     fs.readFileSync(BUILD_DIR + 'version.json').toString()).version;
 
@@ -983,43 +984,49 @@ gulp.task('publish', ['generic'], function (done) {
           done();
         });
     });
-});
+}));
 
-gulp.task('testing-pre', function() {
+gulp.task('testing-pre', function(done) {
   process.env['TESTING'] = 'true';
+  done();
 });
 
-gulp.task('test', ['testing-pre', 'generic', 'components'], function() {
+gulp.task('test', gulp.series('testing-pre', 'generic', 'components',
+    function() {
   return streamqueue({ objectMode: true, },
     createTestSource('unit'), createTestSource('browser'));
-});
+}));
 
-gulp.task('bottest', ['testing-pre', 'generic', 'components'], function() {
+gulp.task('bottest', gulp.series('testing-pre', 'generic', 'components',
+    function() {
   return streamqueue({ objectMode: true, },
     createTestSource('unit', true), createTestSource('font', true),
     createTestSource('browser (no reftest)', true));
-});
+}));
 
-gulp.task('browsertest', ['testing-pre', 'generic', 'components'], function() {
+gulp.task('browsertest', gulp.series('testing-pre', 'generic', 'components',
+    function() {
   return createTestSource('browser');
-});
+}));
 
-gulp.task('unittest', ['testing-pre', 'generic', 'components'], function() {
+gulp.task('unittest', gulp.series('testing-pre', 'generic', 'components',
+    function() {
   return createTestSource('unit');
-});
+}));
 
-gulp.task('fonttest', ['testing-pre'], function() {
+gulp.task('fonttest', gulp.series('testing-pre', function() {
   return createTestSource('font');
-});
+}));
 
-gulp.task('makeref', ['testing-pre', 'generic', 'components'], function(done) {
+gulp.task('makeref', gulp.series('testing-pre', 'generic', 'components',
+    function(done) {
   makeRef(done);
-});
+}));
 
-gulp.task('botmakeref', ['testing-pre', 'generic', 'components'],
+gulp.task('botmakeref', gulp.series('testing-pre', 'generic', 'components',
     function(done) {
   makeRef(done, true);
-});
+}));
 
 gulp.task('baseline', function (done) {
   console.log();
@@ -1057,7 +1064,7 @@ gulp.task('baseline', function (done) {
   });
 });
 
-gulp.task('unittestcli', ['testing-pre', 'lib'], function(done) {
+gulp.task('unittestcli', gulp.series('testing-pre', 'lib', function(done) {
   var options = ['node_modules/jasmine/bin/jasmine',
                  'JASMINE_CONFIG_PATH=test/unit/clitests.json'];
   var jasmineProcess = spawn('node', options, { stdio: 'inherit', });
@@ -1068,7 +1075,7 @@ gulp.task('unittestcli', ['testing-pre', 'lib'], function(done) {
     }
     done();
   });
-});
+}));
 
 gulp.task('lint', function (done) {
   console.log();
@@ -1099,7 +1106,7 @@ gulp.task('lint', function (done) {
   });
 });
 
-gulp.task('server', function (done) {
+gulp.task('server', function () {
   console.log();
   console.log('### Starting local server');
 
@@ -1109,11 +1116,11 @@ gulp.task('server', function (done) {
   server.start();
 });
 
-gulp.task('clean', function(callback) {
+gulp.task('clean', function(done) {
   console.log();
   console.log('### Cleaning up project builds');
 
-  rimraf(BUILD_DIR, callback);
+  rimraf(BUILD_DIR, done);
 });
 
 gulp.task('makefile', function () {
@@ -1140,7 +1147,7 @@ gulp.task('importl10n', function(done) {
   locales.downloadL10n(L10N_DIR, done);
 });
 
-gulp.task('gh-pages-prepare', ['web-pre'], function () {
+gulp.task('gh-pages-prepare', function () {
   console.log();
   console.log('### Creating web site');
 
@@ -1157,7 +1164,7 @@ gulp.task('gh-pages-prepare', ['web-pre'], function () {
   ]);
 });
 
-gulp.task('wintersmith', ['gh-pages-prepare'], function (done) {
+gulp.task('wintersmith', function (done) {
   var wintersmith = require('wintersmith');
   var env = wintersmith('docs/config.json');
   env.build(GH_PAGES_DIR, function (error) {
@@ -1182,7 +1189,7 @@ gulp.task('wintersmith', ['gh-pages-prepare'], function (done) {
   });
 });
 
-gulp.task('gh-pages-git', ['gh-pages-prepare', 'wintersmith'], function () {
+gulp.task('gh-pages-git', function (done) {
   var VERSION = getVersionJSON().version;
   var reason = process.env['PDFJS_UPDATE_REASON'];
 
@@ -1198,12 +1205,14 @@ gulp.task('gh-pages-git', ['gh-pages-prepare', 'wintersmith'], function () {
 
   console.log();
   console.log('Website built in ' + GH_PAGES_DIR);
+  done();
 });
 
-gulp.task('web', ['gh-pages-prepare', 'wintersmith', 'gh-pages-git']);
+gulp.task('web', gulp.series('generic', 'jsdoc', 'gh-pages-prepare',
+                             'wintersmith', 'gh-pages-git'));
 
-gulp.task('dist-pre',
-    ['generic', 'components', 'image_decoders', 'lib', 'minified'], function() {
+gulp.task('dist-pre', gulp.series('generic', 'components', 'image_decoders',
+                                  'lib', 'minified', function() {
   var VERSION = getVersionJSON().version;
 
   console.log();
@@ -1306,9 +1315,9 @@ gulp.task('dist-pre',
     gulp.src(LIB_DIR + '**/*', { base: LIB_DIR, })
         .pipe(gulp.dest(DIST_DIR + 'lib/')),
   ]);
-});
+}));
 
-gulp.task('dist-install', ['dist-pre'], function () {
+gulp.task('dist-install', gulp.series('dist-pre', function (done) {
   var distPath = DIST_DIR;
   var opts = {};
   var installPath = process.env['PDFJS_INSTALL_PATH'];
@@ -1317,9 +1326,10 @@ gulp.task('dist-install', ['dist-pre'], function () {
     distPath = path.relative(installPath, distPath);
   }
   safeSpawnSync('npm', ['install', distPath], opts);
-});
+  done();
+}));
 
-gulp.task('dist-repo-git', ['dist-pre'], function () {
+gulp.task('dist-repo-git', gulp.series('dist-pre', function (done) {
   var VERSION = getVersionJSON().version;
 
   console.log();
@@ -1337,11 +1347,12 @@ gulp.task('dist-repo-git', ['dist-pre'], function () {
   console.log('  cd ' + DIST_DIR + '; ' +
               'git push --tags ' + DIST_REPO_URL + ' master');
   console.log();
-});
+  done();
+}));
 
-gulp.task('dist', ['dist-repo-git']);
+gulp.task('dist', gulp.series('dist-repo-git'));
 
-gulp.task('mozcentralbaseline', ['baseline'], function (done) {
+gulp.task('mozcentralbaseline', gulp.series('baseline', function (done) {
   console.log();
   console.log('### Creating mozcentral baseline environment');
 
@@ -1366,9 +1377,9 @@ gulp.task('mozcentralbaseline', ['baseline'], function (done) {
                       { cwd: MOZCENTRAL_BASELINE_DIR, });
         done();
       });
-});
+}));
 
-gulp.task('mozcentraldiff', ['mozcentral', 'mozcentralbaseline'],
+gulp.task('mozcentraldiff', gulp.series('mozcentral', 'mozcentralbaseline',
     function (done) {
   console.log();
   console.log('### Creating mozcentral diff');
@@ -1396,13 +1407,14 @@ gulp.task('mozcentraldiff', ['mozcentral', 'mozcentralbaseline'],
             done();
           });
       });
-});
+}));
 
-gulp.task('externaltest', function () {
+gulp.task('externaltest', function (done) {
   fancylog('Running test-fixtures.js');
   safeSpawnSync('node', ['external/builder/test-fixtures.js'],
                 { stdio: 'inherit', });
   fancylog('Running test-fixtures_esprima.js');
   safeSpawnSync('node', ['external/builder/test-fixtures_esprima.js'],
                 { stdio: 'inherit', });
+  done();
 });
diff --git a/package-lock.json b/package-lock.json
index 9fff37688..d64aa3522 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1435,12 +1435,30 @@
       "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",
@@ -1459,12 +1477,66 @@
       "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
       "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-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": {
+        "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",
@@ -1515,12 +1587,41 @@
       "integrity": "sha1-trvgsGdLnXGXCMo43owjfLUmw9E=",
       "dev": true
     },
+    "async-done": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/async-done/-/async-done-1.3.1.tgz",
+      "integrity": "sha512-R1BaUeJ4PMoLNJuk+0tLJgjmEqVsdN118+Z8O+alhnQDQgy0kmD5Mqi0DNEmMx2LM0Ed5yekKu+ZXYvIHceicg==",
+      "dev": true,
+      "requires": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.2",
+        "process-nextick-args": "^1.0.7",
+        "stream-exhaust": "^1.0.1"
+      },
+      "dependencies": {
+        "process-nextick-args": {
+          "version": "1.0.7",
+          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
+          "integrity": "sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M=",
+          "dev": true
+        }
+      }
+    },
     "async-each": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
       "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
       "dev": true
     },
+    "async-settle": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async-settle/-/async-settle-1.0.0.tgz",
+      "integrity": "sha1-HQqRS7Aldb7IqPOnTlCA9yssDGs=",
+      "dev": true,
+      "requires": {
+        "async-done": "^1.2.2"
+      }
+    },
     "atob": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.1.tgz",
@@ -1600,6 +1701,23 @@
       "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
       "dev": true
     },
+    "bach": {
+      "version": "1.2.0",
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-      "resolved": "https://registry.npmjs.org/tildify/-/tildify-1.2.0.tgz",
-      "integrity": "sha1-3OwD9V3Km3qj5bBPIYF+tW5jWIo=",
-      "dev": true,
-      "requires": {
-        "os-homedir": "^1.0.0"
-      }
-    },
     "time-stamp": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/time-stamp/-/time-stamp-1.1.0.tgz",
@@ -11441,6 +11539,29 @@
         }
       }
     },
+    "undertaker": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/undertaker/-/undertaker-1.2.0.tgz",
+      "integrity": "sha1-M52kZGJS0ILcN45wgGcpl1DhG0k=",
+      "dev": true,
+      "requires": {
+        "arr-flatten": "^1.0.1",
+        "arr-map": "^2.0.0",
+        "bach": "^1.0.0",
+        "collection-map": "^1.0.0",
+        "es6-weak-map": "^2.0.1",
+        "last-run": "^1.1.0",
+        "object.defaults": "^1.0.0",
+        "object.reduce": "^1.0.0",
+        "undertaker-registry": "^1.0.0"
+      }
+    },
+    "undertaker-registry": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/undertaker-registry/-/undertaker-registry-1.0.1.tgz",
+      "integrity": "sha1-XkvaMI5KiirlhPm5pDWaSZglzFA=",
+      "dev": true
+    },
     "unicode-canonical-property-names-ecmascript": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
@@ -11522,12 +11643,6 @@
         "imurmurhash": "^0.1.4"
       }
     },
-    "unique-stream": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/unique-stream/-/unique-stream-1.0.0.tgz",
-      "integrity": "sha1-1ZpKdUJ0R9mqbJHnAmP40mpLEEs=",
-      "dev": true
-    },
     "unset-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
@@ -11616,12 +11731,6 @@
         "kind-of": "^6.0.2"
       }
     },
-    "user-home": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/user-home/-/user-home-1.1.1.tgz",
-      "integrity": "sha1-K1viOjK2Onyd640PKNSFcko98ZA=",
-      "dev": true
-    },
     "util": {
       "version": "0.10.3",
       "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
@@ -11656,12 +11765,12 @@
       }
     },
     "v8flags": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-2.1.1.tgz",
-      "integrity": "sha1-qrGh+jDUX4jdMhFIh1rALAtV5bQ=",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.1.tgz",
+      "integrity": "sha512-iw/1ViSEaff8NJ3HLyEjawk/8hjJib3E7pvG4pddVXfUg1983s3VGsiClDjhK64MQVDGqc1Q8r18S4VKQZS9EQ==",
       "dev": true,
       "requires": {
-        "user-home": "^1.1.1"
+        "homedir-polyfill": "^1.0.1"
       }
     },
     "validate-npm-package-license": {
diff --git a/package.json b/package.json
index 03746490c..3f846147b 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "eslint-plugin-unicorn": "^4.0.3",
     "fancy-log": "^1.3.2",
     "globals": "^9.18.0",
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.0",
     "gulp-postcss": "^7.0.1",
     "gulp-rename": "^1.4.0",
     "gulp-replace": "^1.0.0",