stickyheader.diff

diff --git a/includes/ServiceWiring.php b/includes/ServiceWiring.php
index 554239ae..54c55f6b 100644
--- a/includes/ServiceWiring.php
+++ b/includes/ServiceWiring.php
@@ -134,6 +134,28 @@ return [
 			]
 		);
 
+		$featureManager->registerRequirement(
+			new OverridableConfigRequirement(
+				$services->getMainConfig(),
+				$context->getUser(),
+				$context->getRequest(),
+				null,
+				'StickyHeader',
+				'requirement-sticky-header',
+				'stickyheader',
+				null
+			)
+		);
+
+		$featureManager->registerFeature(
+			'sticky-header',
+			[
+				Constants::REQUIREMENT_FULLY_INITIALISED,
+				Constants::REQUIREMENT_LATEST_SKIN_VERSION,
+				'requirement-sticky-header'
+			]
+		);
+
 		return $featureManager;
 	}
 ];
diff --git a/includes/SkinVector.php b/includes/SkinVector.php
index d2f2d607..3ae8a396 100644
--- a/includes/SkinVector.php
+++ b/includes/SkinVector.php
@@ -139,6 +139,14 @@ class SkinVector extends SkinMustache {
 	 */
 	private function isLanguagesInHeader() {
 		$featureManager = VectorServices::getFeatureManager();
+
+		if (
+			$featureManager->isFeatureEnabled(
+				'sticky-header'
+			)
+		) {
+			die;
+		}
 		// Disable button on pages without languages (based on Wikibase RepoItemLinkGenerator class)
 
 		return $this->canHaveLanguages() && $featureManager->isFeatureEnabled(
diff --git a/package.json b/package.json
deleted file mode 100644
index d63747a0..00000000
--- a/package.json
+++ /dev/null
@@ -1,42 +0,0 @@
-{
-	"private": true,
-	"scripts": {
-		"start": "bash dev-scripts/setup-storybook.sh && start-storybook --quiet -p 6006",
-		"test": "npm -s run lint && tsc && npm -s run doc",
-		"test:size": "node ./tests/resource-loader-bundlesize.js",
-		"lint": "npm -s run lint:js && npm -s run lint:styles && npm -s run lint:i18n",
-		"lint:fix:js": "npm -s run lint:js -- --fix",
-		"lint:fix:styles": "npm -s run lint:styles -- --fix",
-		"lint:js": "eslint --cache .",
-		"lint:styles": "stylelint \"**/*.{less,css}\"",
-		"lint:i18n": "banana-checker --requireLowerCase=0 i18n/",
-		"selenium-test": "npm -s run test:size",
-		"doc": "jsdoc -c jsdoc.json && npm run build-storybook",
-		"build-storybook": "bash dev-scripts/setup-storybook.sh && build-storybook --quiet --loglevel warn -o docs/ui",
-		"minify-svg": "svgo --config=.svgo.config.js -q -r -f resources/",
-		"pre-commit": "[ \"${PRE_COMMIT:-1}\" -eq 0 ] || npm -s t"
-	},
-	"pre-commit": "pre-commit",
-	"devDependencies": {
-		"@babel/core": "7.7.7",
-		"@storybook/html": "5.2.8",
-		"@types/jquery": "3.3.33",
-		"@types/mustache": "4.0.1",
-		"@types/node-fetch": "2.5.7",
-		"babel-loader": "8.0.6",
-		"bundlesize": "0.18.1",
-		"eslint-config-wikimedia": "0.20.0",
-		"grunt-banana-checker": "0.9.0",
-		"jsdoc": "3.6.7",
-		"jsdoc-wmf-theme": "0.0.3",
-		"less": "3.8.1",
-		"less-loader": "4.1.0",
-		"mustache": "3.0.1",
-		"node-fetch": "2.6.1",
-		"pre-commit": "1.2.2",
-		"stylelint-config-wikimedia": "0.10.3",
-		"svgo": "2.3.0",
-		"typescript": "3.8.3",
-		"vue": "2.6.11"
-	}
-}
diff --git a/skin.json b/skin.json
index 3255d627..97760f36 100644
--- a/skin.json
+++ b/skin.json
@@ -309,6 +309,12 @@
 			},
 			"description": "@var array Moves the personal user links into a consolidated dropdown menu with the exception of the user page link. User page link moves out of personal menu into top level item next to notifications."
 		},
+		"StickyHeader": {
+			"value": {
+				"logged_in": false,
+				"logged_out": false
+			}
+		},
 		"VectorDisableSidebarPersistence": {
 			"value": false,
 			"description": "@var boolean Temporary feature flag that disables saving the sidebar expanded/collapsed state as a user-preference (triggered via clicking the main menu icon). This is intended as a temporary kill-switch in the event that the DB is overloaded with writes to the user_options table."