diff --git a/package-lock.json b/package-lock.json
index d199fb327..678a8d6d2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
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 				"@wikimedia/types-wikimedia": "0.4.4",
-				"eslint-config-wikimedia": "0.27.0",
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@@ -1663,6 +1666,22 @@
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@@ -1872,6 +1886,30 @@
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+			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
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+		"node_modules/@typescript-eslint/typescript-estree/node_modules/minimatch": {
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+			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.4.tgz",
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 		"node_modules/@typescript-eslint/typescript-estree/node_modules/semver": {
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-				"semver": "^7.3.7"
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@@ -2722,27 +2722,6 @@
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@@ -4001,19 +3993,19 @@
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 			"engines": {
-				"node": "^14.15.0 || ^16.10.0 || >=18.0.0"
+				"node": "^16.10.0 || ^18.12.0 || >=20.0.0"
 			},
 			"peerDependencies": {
-				"@typescript-eslint/eslint-plugin": "^5.0.0 || ^6.0.0 || ^7.0.0",
-				"eslint": "^7.0.0 || ^8.0.0",
+				"@typescript-eslint/eslint-plugin": "^6.0.0 || ^7.0.0",
+				"eslint": "^7.0.0 || ^8.0.0 || ^9.0.0",
 				"jest": "*"
 			},
 			"peerDependenciesMeta": {
@@ -4026,19 +4018,19 @@
 			}
 		},
 		"node_modules/eslint-plugin-jsdoc": {
-			"version": "48.2.1",
-			"resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-48.2.1.tgz",
-			"integrity": "sha512-iUvbcyDZSO/9xSuRv2HQBw++8VkV/pt3UWtX9cpPH0l7GKPq78QC/6+PmyQHHvNZaTjAce6QVciEbnc6J/zH5g==",
+			"version": "48.2.5",
+			"resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-48.2.5.tgz",
+			"integrity": "sha512-ZeTfKV474W1N9niWfawpwsXGu+ZoMXu4417eBROX31d7ZuOk8zyG66SO77DpJ2+A9Wa2scw/jRqBPnnQo7VbcQ==",
 			"dev": true,
 			"dependencies": {
-				"@es-joy/jsdoccomment": "~0.42.0",
+				"@es-joy/jsdoccomment": "~0.43.0",
 				"are-docs-informative": "^0.0.2",
 				"comment-parser": "1.4.1",
 				"debug": "^4.3.4",
 				"escape-string-regexp": "^4.0.0",
 				"esquery": "^1.5.0",
 				"is-builtin-module": "^3.2.1",
-				"semver": "^7.6.0",
+				"semver": "^7.6.1",
 				"spdx-expression-parse": "^4.0.0"
 			},
 			"engines": {
@@ -4086,9 +4078,9 @@
 			}
 		},
 		"node_modules/eslint-plugin-mediawiki": {
-			"version": "0.6.0",
-			"resolved": "https://registry.npmjs.org/eslint-plugin-mediawiki/-/eslint-plugin-mediawiki-0.6.0.tgz",
-			"integrity": "sha512-a2Zm18N5nPyflBajM2ZWATxucIpYPEmOSjFzUR1OBH3hAL0GY9fx1mpezEwzqAQ862d+kPkolgQOzktnZe8nKA==",
+			"version": "0.7.0",
+			"resolved": "https://registry.npmjs.org/eslint-plugin-mediawiki/-/eslint-plugin-mediawiki-0.7.0.tgz",
+			"integrity": "sha512-1Y2nsFDPp96xOZCB5ivZAgqYe9i6w2u64VoCIaAzPyZnd/2h8VQR3CtD+u4Yk/KrpbKq9AAJjrs5LS8VAz6KOA==",
 			"dev": true,
 			"dependencies": {
 				"eslint-plugin-vue": "^9.23.0",
@@ -4143,48 +4135,66 @@
 			}
 		},
 		"node_modules/eslint-plugin-n": {
-			"version": "16.6.2",
-			"resolved": "https://registry.npmjs.org/eslint-plugin-n/-/eslint-plugin-n-16.6.2.tgz",
-			"integrity": "sha512-6TyDmZ1HXoFQXnhCTUjVFULReoBPOAjpuiKELMkeP40yffI/1ZRO+d9ug/VC6fqISo2WkuIBk3cvuRPALaWlOQ==",
+			"version": "17.8.1",
+			"resolved": "https://registry.npmjs.org/eslint-plugin-n/-/eslint-plugin-n-17.8.1.tgz",
+			"integrity": "sha512-KdG0h0voZms8UhndNu8DeWx1eM4sY+A4iXtsNo6kOfJLYHNeTGPacGalJ9GcvrbmOL3r/7QOMwVZDSw+1SqsrA==",
 			"dev": true,
 			"dependencies": {
 				"@eslint-community/eslint-utils": "^4.4.0",
-				"builtins": "^5.0.1",
+				"enhanced-resolve": "^5.17.0",
 				"eslint-plugin-es-x": "^7.5.0",
 				"get-tsconfig": "^4.7.0",
-				"globals": "^13.24.0",
+				"globals": "^15.0.0",
 				"ignore": "^5.2.4",
-				"is-builtin-module": "^3.2.1",
-				"is-core-module": "^2.12.1",
-				"minimatch": "^3.1.2",
-				"resolve": "^1.22.2",
+				"minimatch": "^9.0.0",
 				"semver": "^7.5.3"
 			},
 			"engines": {
-				"node": ">=16.0.0"
+				"node": "^18.18.0 || ^20.9.0 || >=21.1.0"
 			},
 			"funding": {
-				"url": "https://github.com/sponsors/mysticatea"
+				"url": "https://opencollective.com/eslint"
 			},
 			"peerDependencies": {
-				"eslint": ">=7.0.0"
+				"eslint": ">=8.23.0"
+			}
+		},
+		"node_modules/eslint-plugin-n/node_modules/brace-expansion": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+			"integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+			"dev": true,
+			"dependencies": {
+				"balanced-match": "^1.0.0"
 			}
 		},
 		"node_modules/eslint-plugin-n/node_modules/globals": {
-			"version": "13.24.0",
-			"resolved": "https://registry.npmjs.org/globals/-/globals-13.24.0.tgz",
-			"integrity": "sha512-AhO5QUcj8llrbG09iWhPU2B204J1xnPeL8kQmVorSsy+Sjj1sk8gIyh6cUocGmH4L0UuhAJy+hJMRA4mgA4mFQ==",
+			"version": "15.3.0",
+			"resolved": "https://registry.npmjs.org/globals/-/globals-15.3.0.tgz",
+			"integrity": "sha512-cCdyVjIUVTtX8ZsPkq1oCsOsLmGIswqnjZYMJJTGaNApj1yHtLSymKhwH51ttirREn75z3p4k051clwg7rvNKA==",
 			"dev": true,
-			"dependencies": {
-				"type-fest": "^0.20.2"
-			},
 			"engines": {
-				"node": ">=8"
+				"node": ">=18"
 			},
 			"funding": {
 				"url": "https://github.com/sponsors/sindresorhus"
 			}
 		},
+		"node_modules/eslint-plugin-n/node_modules/minimatch": {
+			"version": "9.0.4",
+			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.4.tgz",
+			"integrity": "sha512-KqWh+VchfxcMNRAJjj2tnsSJdNbHsVgnkBhTNrW7AjVo6OvLtxw8zfT9oLw1JSohlFzJ8jCoTgaoXvJ+kHt6fw==",
+			"dev": true,
+			"dependencies": {
+				"brace-expansion": "^2.0.1"
+			},
+			"engines": {
+				"node": ">=16 || 14 >=14.17"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/isaacs"
+			}
+		},
 		"node_modules/eslint-plugin-n/node_modules/semver": {
 			"version": "7.6.2",
 			"resolved": "https://registry.npmjs.org/semver/-/semver-7.6.2.tgz",
@@ -4197,18 +4207,6 @@
 				"node": ">=10"
 			}
 		},
-		"node_modules/eslint-plugin-n/node_modules/type-fest": {
-			"version": "0.20.2",
-			"resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
-			"integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
-			"dev": true,
-			"engines": {
-				"node": ">=10"
-			},
-			"funding": {
-				"url": "https://github.com/sponsors/sindresorhus"
-			}
-		},
 		"node_modules/eslint-plugin-no-jquery": {
 			"version": "2.7.0",
 			"resolved": "https://registry.npmjs.org/eslint-plugin-no-jquery/-/eslint-plugin-no-jquery-2.7.0.tgz",
@@ -4241,17 +4239,17 @@
 			}
 		},
 		"node_modules/eslint-plugin-unicorn": {
-			"version": "51.0.1",
-			"resolved": "https://registry.npmjs.org/eslint-plugin-unicorn/-/eslint-plugin-unicorn-51.0.1.tgz",
-			"integrity": "sha512-MuR/+9VuB0fydoI0nIn2RDA5WISRn4AsJyNSaNKLVwie9/ONvQhxOBbkfSICBPnzKrB77Fh6CZZXjgTt/4Latw==",
+			"version": "53.0.0",
+			"resolved": "https://registry.npmjs.org/eslint-plugin-unicorn/-/eslint-plugin-unicorn-53.0.0.tgz",
+			"integrity": "sha512-kuTcNo9IwwUCfyHGwQFOK/HjJAYzbODHN3wP0PgqbW+jbXqpNWxNVpVhj2tO9SixBwuAdmal8rVcWKBxwFnGuw==",
 			"dev": true,
 			"dependencies": {
-				"@babel/helper-validator-identifier": "^7.22.20",
+				"@babel/helper-validator-identifier": "^7.24.5",
 				"@eslint-community/eslint-utils": "^4.4.0",
-				"@eslint/eslintrc": "^2.1.4",
+				"@eslint/eslintrc": "^3.0.2",
 				"ci-info": "^4.0.0",
 				"clean-regexp": "^1.0.0",
-				"core-js-compat": "^3.34.0",
+				"core-js-compat": "^3.37.0",
 				"esquery": "^1.5.0",
 				"indent-string": "^4.0.0",
 				"is-builtin-module": "^3.2.1",
@@ -4260,11 +4258,11 @@
 				"read-pkg-up": "^7.0.1",
 				"regexp-tree": "^0.1.27",
 				"regjsparser": "^0.10.0",
-				"semver": "^7.5.4",
+				"semver": "^7.6.1",
 				"strip-indent": "^3.0.0"
 			},
 			"engines": {
-				"node": ">=16"
+				"node": ">=18.18"
 			},
 			"funding": {
 				"url": "https://github.com/sindresorhus/eslint-plugin-unicorn?sponsor=1"
@@ -4273,6 +4271,88 @@
 				"eslint": ">=8.56.0"
 			}
 		},
+		"node_modules/eslint-plugin-unicorn/node_modules/@eslint/eslintrc": {
+			"version": "3.1.0",
+			"resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.1.0.tgz",
+			"integrity": "sha512-4Bfj15dVJdoy3RfZmmo86RK1Fwzn6SstsvK9JS+BaVKqC6QQQQyXekNaC+g+LKNgkQ+2VhGAzm6hO40AhMR3zQ==",
+			"dev": true,
+			"dependencies": {
+				"ajv": "^6.12.4",
+				"debug": "^4.3.2",
+				"espree": "^10.0.1",
+				"globals": "^14.0.0",
+				"ignore": "^5.2.0",
+				"import-fresh": "^3.2.1",
+				"js-yaml": "^4.1.0",
+				"minimatch": "^3.1.2",
+				"strip-json-comments": "^3.1.1"
+			},
+			"engines": {
+				"node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/eslint"
+			}
+		},
+		"node_modules/eslint-plugin-unicorn/node_modules/argparse": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
+			"integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
+			"dev": true
+		},
+		"node_modules/eslint-plugin-unicorn/node_modules/eslint-visitor-keys": {
+			"version": "4.0.0",
+			"resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.0.0.tgz",
+			"integrity": "sha512-OtIRv/2GyiF6o/d8K7MYKKbXrOUBIK6SfkIRM4Z0dY3w+LiQ0vy3F57m0Z71bjbyeiWFiHJ8brqnmE6H6/jEuw==",
+			"dev": true,
+			"engines": {
+				"node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/eslint"
+			}
+		},
+		"node_modules/eslint-plugin-unicorn/node_modules/espree": {
+			"version": "10.0.1",
+			"resolved": "https://registry.npmjs.org/espree/-/espree-10.0.1.tgz",
+			"integrity": "sha512-MWkrWZbJsL2UwnjxTX3gG8FneachS/Mwg7tdGXce011sJd5b0JG54vat5KHnfSBODZ3Wvzd2WnjxyzsRoVv+ww==",
+			"dev": true,
+			"dependencies": {
+				"acorn": "^8.11.3",
+				"acorn-jsx": "^5.3.2",
+				"eslint-visitor-keys": "^4.0.0"
+			},
+			"engines": {
+				"node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/eslint"
+			}
+		},
+		"node_modules/eslint-plugin-unicorn/node_modules/globals": {
+			"version": "14.0.0",
+			"resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+			"integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+			"dev": true,
+			"engines": {
+				"node": ">=18"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/sindresorhus"
+			}
+		},
+		"node_modules/eslint-plugin-unicorn/node_modules/js-yaml": {
+			"version": "4.1.0",
+			"resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
+			"integrity": "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==",
+			"dev": true,
+			"dependencies": {
+				"argparse": "^2.0.1"
+			},
+			"bin": {
+				"js-yaml": "bin/js-yaml.js"
+			}
+		},
 		"node_modules/eslint-plugin-unicorn/node_modules/jsesc": {
 			"version": "3.0.2",
 			"resolved": "https://registry.npmjs.org/jsesc/-/jsesc-3.0.2.tgz",
@@ -10305,6 +10385,15 @@
 			"integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
 			"dev": true
 		},
+		"node_modules/tapable": {
+			"version": "2.2.1",
+			"resolved": "https://registry.npmjs.org/tapable/-/tapable-2.2.1.tgz",
+			"integrity": "sha512-GNzQvQTOIP6RyTfE2Qxb8ZVlNmw0n88vp1szwWRimP02mnTsx3Wtn5qRdqY9w2XduFNUgvOwhNnQsjwCp+kqaQ==",
+			"dev": true,
+			"engines": {
+				"node": ">=6"
+			}
+		},
 		"node_modules/terminal-link": {
 			"version": "2.1.1",
 			"resolved": "https://registry.npmjs.org/terminal-link/-/terminal-link-2.1.1.tgz",
@@ -10480,6 +10569,18 @@
 				"url": "https://github.com/sponsors/sindresorhus"
 			}
 		},
+		"node_modules/ts-api-utils": {
+			"version": "1.3.0",
+			"resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-1.3.0.tgz",
+			"integrity": "sha512-UQMIo7pb8WRomKR1/+MFVLTroIvDVtMX3K6OUir8ynLyzB8Jeriont2bTAtmNPa1ekAgN7YPDyf6V+ygrdU+eQ==",
+			"dev": true,
+			"engines": {
+				"node": ">=16"
+			},
+			"peerDependencies": {
+				"typescript": ">=4.2.0"
+			}
+		},
 		"node_modules/ts-jest": {
 			"version": "27.1.5",
 			"resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-27.1.5.tgz",
@@ -10565,27 +10666,6 @@
 				"node": ">=0.10.0"
 			}
 		},
-		"node_modules/tslib": {
-			"version": "1.14.1",
-			"resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
-			"integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
-			"dev": true
-		},
-		"node_modules/tsutils": {
-			"version": "3.21.0",
-			"resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.21.0.tgz",
-			"integrity": "sha512-mHKK3iUXL+3UF6xL5k0PEhKRUBKPBCv/+RkEOpjRWxxx27KKRBmmA60A9pgOUvMi8GKhRMPEmjBRPzs2W7O1OA==",
-			"dev": true,
-			"dependencies": {
-				"tslib": "^1.8.1"
-			},
-			"engines": {
-				"node": ">= 6"
-			},
-			"peerDependencies": {
-				"typescript": ">=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta"
-			}
-		},
 		"node_modules/type-check": {
 			"version": "0.4.0",
 			"resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -10804,9 +10884,9 @@
 			"dev": true
 		},
 		"node_modules/vue-eslint-parser": {
-			"version": "9.4.2",
-			"resolved": "https://registry.npmjs.org/vue-eslint-parser/-/vue-eslint-parser-9.4.2.tgz",
-			"integrity": "sha512-Ry9oiGmCAK91HrKMtCrKFWmSFWvYkpGglCeFAIqDdr9zdXmMMpJOmUJS7WWsW7fX81h6mwHmUZCQQ1E0PkSwYQ==",
+			"version": "9.4.3",
+			"resolved": "https://registry.npmjs.org/vue-eslint-parser/-/vue-eslint-parser-9.4.3.tgz",
+			"integrity": "sha512-2rYRLWlIpaiN8xbPiDyXZXRgLGOtWxERV7ND5fFAv5qo1D2N9Fu9MNajBNc6o13lZ+24DAWCkQCvj4klgmcITg==",
 			"dev": true,
 			"dependencies": {
 				"debug": "^4.3.4",
diff --git a/package.json b/package.json
index ae34f765e..fe2235ea4 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
 		"@wikimedia/codex-icons": "1.6.1",
 		"@wikimedia/mw-node-qunit": "7.2.0",
 		"@wikimedia/types-wikimedia": "0.4.4",
-		"eslint-config-wikimedia": "0.27.0",
+		"eslint-config-wikimedia": "0.28.0",
 		"eslint-plugin-no-jquery": "2.7.0",
 		"grunt-banana-checker": "0.13.0",
 		"jest": "27.4.7",
diff --git a/resources/skins.vector.clientPreferences/clientPreferences.js b/resources/skins.vector.clientPreferences/clientPreferences.js
index 2870f9075..4933666b9 100644
--- a/resources/skins.vector.clientPreferences/clientPreferences.js
+++ b/resources/skins.vector.clientPreferences/clientPreferences.js
@@ -63,7 +63,7 @@ function toggleDocClassAndSave( featureName, value, config ) {
 		} );
 		document.documentElement.classList.add( `${ featureName }-clientpref-${ value }` );
 		// Ideally this should be taken care of via a single core helper function.
-		mw.util.debounce( function () {
+		mw.util.debounce( () => {
 			api = api || new mw.Api();
 			api.saveOption( pref.preferenceKey, value ).then( () => {
 				callback();
@@ -213,9 +213,8 @@ function createRow( className ) {
  * @param {string} featureName
  * @return {MwMessage}
  */
-const getFeatureLabelMsg = ( featureName ) =>
-	// eslint-disable-next-line mediawiki/msg-doc
-	mw.message( `${ featureName }-name` );
+// eslint-disable-next-line mediawiki/msg-doc
+const getFeatureLabelMsg = ( featureName ) => mw.message( `${ featureName }-name` );
 
 /**
  * adds a toggle button
diff --git a/resources/skins.vector.js/dropdownMenus.js b/resources/skins.vector.js/dropdownMenus.js
index 2a031619e..e3254fd6a 100644
--- a/resources/skins.vector.js/dropdownMenus.js
+++ b/resources/skins.vector.js/dropdownMenus.js
@@ -16,7 +16,7 @@ function dropdownMenus( containers ) {
 	// Search for all dropdown containers using the CHECKBOX_HACK_CONTAINER_SELECTOR.
 	containers = containers || document.querySelectorAll( CHECKBOX_HACK_CONTAINER_SELECTOR );
 
-	Array.prototype.forEach.call( containers, function ( container ) {
+	Array.prototype.forEach.call( containers, ( container ) => {
 		const
 			checkbox = container.querySelector( CHECKBOX_HACK_CHECKBOX_SELECTOR ),
 			button = container.querySelector( CHECKBOX_HACK_BUTTON_SELECTOR ),
@@ -157,7 +157,7 @@ function addPortletLinkHandler( item, data ) {
 // Enhance previously added items.
 Array.prototype.forEach.call(
 	document.querySelectorAll( '.mw-list-item-js' ),
-	function ( item ) {
+	( item ) => {
 		addPortletLinkHandler( item, {
 			id: item.getAttribute( 'id' )
 		} );
diff --git a/resources/skins.vector.js/echo.js b/resources/skins.vector.js/echo.js
index 861a47291..f337722a2 100644
--- a/resources/skins.vector.js/echo.js
+++ b/resources/skins.vector.js/echo.js
@@ -7,7 +7,7 @@ function init() {
 		return;
 	}
 
-	mw.hook( 'ext.echo.NotificationBadgeWidget.onInitialize' ).add( function ( badge ) {
+	mw.hook( 'ext.echo.NotificationBadgeWidget.onInitialize' ).add( ( badge ) => {
 		const element = badge.$element[ 0 ];
 		element.classList.add( 'mw-list-item' );
 		const anchor = /** @type {HTMLElement} */ ( element.querySelector( 'a' ) );
diff --git a/resources/skins.vector.js/features.js b/resources/skins.vector.js/features.js
index 2969c4892..b24e7e535 100644
--- a/resources/skins.vector.js/features.js
+++ b/resources/skins.vector.js/features.js
@@ -23,7 +23,7 @@ function save( feature, enabled ) {
 				break;
 		}
 	} else {
-		debounce( function () {
+		debounce( () => {
 			api = api || new mw.Api();
 			api.saveOption( 'vector-' + feature, enabled ? 1 : 0 );
 		}, 500 )();
diff --git a/resources/skins.vector.js/languageButton.js b/resources/skins.vector.js/languageButton.js
index d15abb44b..3891fa7d3 100644
--- a/resources/skins.vector.js/languageButton.js
+++ b/resources/skins.vector.js/languageButton.js
@@ -25,7 +25,7 @@ function addInterwikiLinkToMainMenu() {
 	);
 
 	if ( addInterlanguageLink ) {
-		addInterlanguageLink.addEventListener( 'click', function ( /** @type {Event} */ e ) {
+		addInterlanguageLink.addEventListener( 'click', ( /** @type {Event} */ e ) => {
 			e.preventDefault();
 			// redirect to the detached and original edit link
 			editLink.click();
diff --git a/resources/skins.vector.js/limitedWidthToggle.js b/resources/skins.vector.js/limitedWidthToggle.js
index 589deaf66..2020317ac 100644
--- a/resources/skins.vector.js/limitedWidthToggle.js
+++ b/resources/skins.vector.js/limitedWidthToggle.js
@@ -55,7 +55,7 @@ function init() {
 			} );
 	};
 
-	toggle.addEventListener( 'click', function () {
+	toggle.addEventListener( 'click', () => {
 		const isLimitedWidth = features.isEnabled( LIMITED_WIDTH_FEATURE_NAME );
 		const oldIcon = isLimitedWidth ? 'fullScreen' : 'exitFullscreen';
 		const newIcon = isLimitedWidth ? 'exitFullscreen' : 'fullScreen';
diff --git a/resources/skins.vector.js/menuTabs.js b/resources/skins.vector.js/menuTabs.js
index d5651fee8..6018cf3fa 100644
--- a/resources/skins.vector.js/menuTabs.js
+++ b/resources/skins.vector.js/menuTabs.js
@@ -24,7 +24,7 @@ function init() {
 		/**
 		 * @param {HTMLElement} item
 		 */
-		function ( item ) {
+		( item ) => {
 			// Check if this menu item belongs to a tabs menu.
 			if ( item.closest( TABS_SELECTOR ) ) {
 				addNoIconClass( item );
diff --git a/resources/skins.vector.js/pinnableElement.js b/resources/skins.vector.js/pinnableElement.js
index 9f3e97fd8..60ba24e37 100644
--- a/resources/skins.vector.js/pinnableElement.js
+++ b/resources/skins.vector.js/pinnableElement.js
@@ -152,7 +152,7 @@ function setFocusAfterToggle( pinnableElementId ) {
  */
 function bindPinnableToggleButtons( header ) {
 	const toggleButtons = header.querySelectorAll( '.vector-pinnable-header-toggle-button' );
-	toggleButtons.forEach( function ( button ) {
+	toggleButtons.forEach( ( button ) => {
 		button.addEventListener( 'click', pinnableElementClickHandler.bind( null, header ) );
 	} );
 }
@@ -277,9 +277,9 @@ function initPinnableElement() {
 function hasPinnedElements() {
 	const suffixesToCheck = [ 'pinned-clientpref-1', 'pinned-enabled' ];
 	const htmlElement = document.documentElement;
-	return Array.from( htmlElement.classList ).some( ( className ) => {
-		return suffixesToCheck.some( ( suffix ) => className.endsWith( suffix ) );
-	} );
+	return Array.from( htmlElement.classList ).some(
+		( className ) => suffixesToCheck.some( ( suffix ) => className.endsWith( suffix ) )
+	);
 }
 
 /**
diff --git a/resources/skins.vector.js/scrollObserver.js b/resources/skins.vector.js/scrollObserver.js
index 4fe388e5c..780d9abaf 100644
--- a/resources/skins.vector.js/scrollObserver.js
+++ b/resources/skins.vector.js/scrollObserver.js
@@ -38,7 +38,7 @@ function firePageTitleScrollHook( direction ) {
  * @return {IntersectionObserver}
  */
 function initScrollObserver( show, hide ) {
-	return new IntersectionObserver( function ( entries ) {
+	return new IntersectionObserver( ( entries ) => {
 		if ( !entries[ 0 ].isIntersecting && entries[ 0 ].boundingClientRect.top < 0 ) {
 			// Viewport has crossed the bottom edge of the target element.
 			show();
diff --git a/resources/skins.vector.js/searchLoader.js b/resources/skins.vector.js/searchLoader.js
index 7f35aeb70..f2963ff84 100644
--- a/resources/skins.vector.js/searchLoader.js
+++ b/resources/skins.vector.js/searchLoader.js
@@ -96,7 +96,7 @@ function initSearchLoader( document ) {
 		return;
 	}
 
-	Array.prototype.forEach.call( searchBoxes, function ( searchBox ) {
+	Array.prototype.forEach.call( searchBoxes, ( searchBox ) => {
 		const searchInner = searchBox.querySelector( 'form > div' ),
 			searchInput = searchBox.querySelector( 'input[name="search"]' ),
 			isPrimarySearch = searchInput && searchInput.getAttribute( 'id' ) === 'searchInput';
@@ -111,7 +111,7 @@ function initSearchLoader( document ) {
 			'skins.vector.search',
 			isPrimarySearch ? LOAD_START_MARK : null,
 			// Note, loading Vue.js will remove the element from the DOM.
-			function () {
+			() => {
 				if ( isPrimarySearch ) {
 					markLoadEnd( LOAD_START_MARK, LOAD_END_MARK, LOAD_MEASURE );
 				}
diff --git a/resources/skins.vector.js/setupIntersectionObservers.js b/resources/skins.vector.js/setupIntersectionObservers.js
index 9f9be6021..c94c2e45d 100644
--- a/resources/skins.vector.js/setupIntersectionObservers.js
+++ b/resources/skins.vector.js/setupIntersectionObservers.js
@@ -29,11 +29,12 @@ const belowDesktopMedia = window.matchMedia( '(max-width: 999px)' );
  * @param {Function} changeActiveSection
  * @return {OnIntersection}
  */
-const getHeadingIntersectionHandler = ( changeActiveSection ) => {
+const getHeadingIntersectionHandler = ( changeActiveSection ) =>
 	/**
 	 * @param {HTMLElement} section
 	 */
-	return ( section ) => {
+	// eslint-disable-next-line implicit-arrow-linebreak
+	( section ) => {
 		const headline = section.classList.contains( 'mw-body-content' ) ?
 			section :
 			section.querySelector( HEADLINE_SELECTOR );
@@ -41,7 +42,6 @@ const getHeadingIntersectionHandler = ( changeActiveSection ) => {
 			changeActiveSection( `${ TOC_SECTION_ID_PREFIX }${ headline.id }` );
 		}
 	};
-};
 
 /**
  * Initialize sticky header AB tests and determine whether to show the sticky header
@@ -221,8 +221,8 @@ const setupTableOfContents = ( tocElement, bodyContent, initSectionObserverFn )
 	mw.hook( 've.activationStart' ).add( () => {
 		sectionObserver.pause();
 	} );
-	mw.hook( 'wikipage.tableOfContents' ).add( function ( sections ) {
-		tableOfContents.reloadTableOfContents( sections ).then( function () {
+	mw.hook( 'wikipage.tableOfContents' ).add( ( sections ) => {
+		tableOfContents.reloadTableOfContents( sections ).then( () => {
 			/**
 			 * @stable for use in gadgets and extensions
 			 * @since 1.40
diff --git a/resources/skins.vector.js/skin.js b/resources/skins.vector.js/skin.js
index b90bae9ac..1b4f79126 100644
--- a/resources/skins.vector.js/skin.js
+++ b/resources/skins.vector.js/skin.js
@@ -124,7 +124,7 @@ function init( window ) {
 	// When EventLogging is not available this will reject.
 	// This code can be removed by the end of the Desktop improvements project.
 	// https://www.mediawiki.org/wiki/Desktop_improvements
-	mw.loader.using( 'ext.eventLogging' ).then( function () {
+	mw.loader.using( 'ext.eventLogging' ).then( () => {
 		if (
 			mw.eventLog &&
 			mw.eventLog.eventInSample( 100 /* 1 in 100 */ ) &&
@@ -145,7 +145,7 @@ if ( document.readyState === 'interactive' || document.readyState === 'complete'
 	main( window );
 } else {
 	// This is needed when document.readyState === 'loading'.
-	document.addEventListener( 'DOMContentLoaded', function () {
+	document.addEventListener( 'DOMContentLoaded', () => {
 		main( window );
 	} );
 }
diff --git a/resources/skins.vector.js/stickyHeader.js b/resources/skins.vector.js/stickyHeader.js
index c38049ddf..7e1cb1597 100644
--- a/resources/skins.vector.js/stickyHeader.js
+++ b/resources/skins.vector.js/stickyHeader.js
@@ -145,7 +145,7 @@ function updateStickyWatchlink( watchLink, isWatched ) {
  * @param {string} className
  */
 function removeClassFromNodes( nodes, className ) {
-	Array.prototype.forEach.call( nodes, function ( node ) {
+	Array.prototype.forEach.call( nodes, ( node ) => {
 		node.classList.remove( className );
 	} );
 }
@@ -154,7 +154,7 @@ function removeClassFromNodes( nodes, className ) {
  * @param {NodeList} nodes
  */
 function removeNodes( nodes ) {
-	Array.prototype.forEach.call( nodes, function ( node ) {
+	Array.prototype.forEach.call( nodes, ( node ) => {
 		node.parentNode.removeChild( node );
 	} );
 }
@@ -293,7 +293,7 @@ function prepareEditIcons(
 		copyButtonAttributes( primaryEdit, primaryEditSticky );
 		suffixStickyHref( primaryEditSticky );
 
-		primaryEditSticky.addEventListener( 'click', function ( ev ) {
+		primaryEditSticky.addEventListener( 'click', ( ev ) => {
 			const target = ev.target;
 			// T336639:
 			// eslint-disable-next-line no-jquery/no-jquery-constructor
@@ -316,7 +316,7 @@ function prepareEditIcons(
 		if ( secondaryEdit ) {
 			copyButtonAttributes( secondaryEdit, wikitextSticky );
 			suffixStickyHref( wikitextSticky );
-			wikitextSticky.addEventListener( 'click', function ( ev ) {
+			wikitextSticky.addEventListener( 'click', ( ev ) => {
 				const target = ev.target;
 				if ( target ) {
 					// T336639:
@@ -424,7 +424,7 @@ function prepareUserLinksDropdown( userLinksDropdown ) {
 	// Make the logout go through the API (T324638)
 	const logoutLink = /** @type {HTMLAnchorElement} */( userLinksDropdownClone.querySelector( '#pt-logout-sticky-header a' ) );
 	if ( logoutLink ) {
-		logoutLink.addEventListener( 'click', function ( ev ) {
+		logoutLink.addEventListener( 'click', ( ev ) => {
 			ev.preventDefault();
 			mw.hook( 'skin.logout' ).fire( logoutLink.href );
 		} );
@@ -568,7 +568,7 @@ function initStickyHeader( props ) {
 	addVisualEditorHooks( props.stickyIntersection, props.observer );
 
 	// Make sure ULS outside sticky header disables the sticky header behaviour.
-	mw.hook( 'mw.uls.compact_language_links.open' ).add( function ( $trigger ) {
+	mw.hook( 'mw.uls.compact_language_links.open' ).add( ( $trigger ) => {
 		const trigger = $trigger[ 0 ];
 		if ( trigger.id !== 'p-lang-btn-sticky-header' ) {
 			const bodyClassList = document.body.classList;
@@ -580,7 +580,7 @@ function initStickyHeader( props ) {
 	// Make sure ULS dialog is sticky.
 	const langBtn = props.header.querySelector( '#p-lang-btn-sticky-header' );
 	if ( langBtn ) {
-		langBtn.addEventListener( 'click', function () {
+		langBtn.addEventListener( 'click', () => {
 			const bodyClassList = document.body.classList;
 			bodyClassList.remove( ULS_HIDE_CLASS );
 			bodyClassList.add( ULS_STICKY_CLASS );
diff --git a/resources/skins.vector.js/tableOfContents.js b/resources/skins.vector.js/tableOfContents.js
index d29055c65..5bf744821 100644
--- a/resources/skins.vector.js/tableOfContents.js
+++ b/resources/skins.vector.js/tableOfContents.js
@@ -126,9 +126,7 @@ module.exports = function tableOfContents( props ) {
 	 *
 	 * @return {boolean}
 	 */
-	const prefersReducedMotion = () => {
-		return window.matchMedia( '(prefers-reduced-motion: reduce)' ).matches;
-	};
+	const prefersReducedMotion = () => window.matchMedia( '(prefers-reduced-motion: reduce)' ).matches;
 
 	/**
 	 * Sets an `ACTIVE_SECTION_CLASS` on the element with an id that matches `id`.
@@ -301,7 +299,7 @@ module.exports = function tableOfContents( props ) {
 	 */
 	function collapseSections( selectedIds ) {
 		const sectionIdsToCollapse = selectedIds || getExpandedSectionIds();
-		expandedSections = expandedSections.filter( function ( section ) {
+		expandedSections = expandedSections.filter( ( section ) => {
 			const isSelected = sectionIdsToCollapse.indexOf( section.id ) > -1;
 			const toggle = isSelected ? section.getElementsByClassName( TOGGLE_CLASS ) : undefined;
 			if ( isSelected && toggle && toggle.length > 0 ) {
@@ -383,7 +381,7 @@ module.exports = function tableOfContents( props ) {
 	 */
 	function bindPinnedToggleListeners() {
 		const toggleButtons = document.querySelectorAll( '.vector-toc-pinnable-header button' );
-		toggleButtons.forEach( function ( btn ) {
+		toggleButtons.forEach( ( btn ) => {
 			btn.addEventListener( 'click', () => {
 				props.onTogglePinned();
 			} );
@@ -394,7 +392,7 @@ module.exports = function tableOfContents( props ) {
 	 * Bind event listeners for clicking on section headings and toggle buttons.
 	 */
 	function bindSubsectionToggleListeners() {
-		props.container.addEventListener( 'click', function ( e ) {
+		props.container.addEventListener( 'click', ( e ) => {
 			if (
 				!( e.target instanceof HTMLElement )
 			) {
diff --git a/resources/skins.vector.js/watchstar.js b/resources/skins.vector.js/watchstar.js
index bd8badf33..f05c06b15 100644
--- a/resources/skins.vector.js/watchstar.js
+++ b/resources/skins.vector.js/watchstar.js
@@ -27,7 +27,7 @@ const updateWatchIcon = ( watchIcon, isWatched, expiry ) => {
 
 const init = () => {
 	mw.hook( 'wikipage.watchlistChange' ).add(
-		function ( /** @type {boolean} */ isWatched, /** @type {string} */ expiry ) {
+		( /** @type {boolean} */ isWatched, /** @type {string} */ expiry ) => {
 			const watchIcons = document.querySelectorAll( '.mw-watchlink .vector-icon' );
 			if ( !watchIcons ) {
 				return;
diff --git a/resources/skins.vector.legacy.js/collapsibleTabs.js b/resources/skins.vector.legacy.js/collapsibleTabs.js
index f93e78ca3..4f95e023a 100644
--- a/resources/skins.vector.legacy.js/collapsibleTabs.js
+++ b/resources/skins.vector.legacy.js/collapsibleTabs.js
@@ -42,7 +42,7 @@ function init() {
 		// if we haven't already bound our resize handler, bind it now
 		if ( !boundEvent ) {
 			boundEvent = true;
-			$( window ).on( 'resize', mw.util.debounce( function () {
+			$( window ).on( 'resize', mw.util.debounce( () => {
 				rAF( $.collapsibleTabs.handleResize );
 			}, 10 ) );
 		}
@@ -96,7 +96,7 @@ function init() {
 			return settings || {};
 		},
 		handleResize: function () {
-			$.collapsibleTabs.instances.forEach( function ( $el ) {
+			$.collapsibleTabs.instances.forEach( ( $el ) => {
 				const data = $.collapsibleTabs.getSettings( $el );
 
 				if ( $.isEmptyObject( data ) || data.shifting ) {
@@ -188,7 +188,7 @@ function init() {
 					.data( 'collapsibleTabsSettings', data )
 					.animate( { width: expandedWidth + 'px' }, 'normal', function () {
 						$( this ).attr( 'style', 'display: block;' );
-						rAF( function () {
+						rAF( () => {
 							// Update the 'expandedWidth' in case someone was brazen enough to
 							// change the tab's contents after the page load *gasp* (T71729). This
 							// doesn't prevent a tab from collapsing back and forth once, but at
diff --git a/resources/skins.vector.legacy.js/vector.js b/resources/skins.vector.legacy.js/vector.js
index 8a1fa0ac8..4c34bd181 100644
--- a/resources/skins.vector.legacy.js/vector.js
+++ b/resources/skins.vector.legacy.js/vector.js
@@ -26,7 +26,7 @@ function init() {
 	// Bind callback functions to animate our drop down menu in and out
 	// and then call the collapsibleTabs function on the menu
 	$tabContainer
-		.on( 'beforeTabCollapse', function () {
+		.on( 'beforeTabCollapse', () => {
 			let expandedWidth;
 			// If the dropdown was hidden, show it
 			if ( !mw.util.isPortletVisible( cactionsId ) ) {
@@ -42,7 +42,7 @@ function init() {
 					.animate( { width: expandedWidth }, 'normal' );
 			}
 		} )
-		.on( 'beforeTabExpand', function () {
+		.on( 'beforeTabExpand', () => {
 			// If we're removing the last child node right now, hide the dropdown
 			if ( $cactions.find( 'li' ).length === 1 ) {
 				// eslint-disable-next-line no-jquery/no-animate
@@ -98,7 +98,7 @@ function init() {
 				// 3. and, the left-navigation and right-navigation are overlapping
 				//    each other, e.g. when making the window very narrow, or if a gadget
 				//    added a lot of tabs.
-				$tabContainer.children( 'li.collapsible' ).each( function ( _index, element ) {
+				$tabContainer.children( 'li.collapsible' ).each( ( _index, element ) => {
 					collapsibleWidth += $( element ).width() || 0;
 					if ( collapsibleWidth > initialCactionsWidth() ) {
 						// We've found one or more collapsible links that are wider
diff --git a/resources/skins.vector.search/restSearchClient.js b/resources/skins.vector.search/restSearchClient.js
index 781b152ca..31e1bf5a0 100644
--- a/resources/skins.vector.search/restSearchClient.js
+++ b/resources/skins.vector.search/restSearchClient.js
@@ -108,9 +108,9 @@ function restSearchClient( config ) {
 				}
 			} );
 			const searchResponsePromise = result.fetch
-				.then( ( /** @type {RestResponse} */ res ) => {
-					return adaptApiResponse( config, q, res, showDescription );
-				} );
+				.then( ( /** @type {RestResponse} */ res ) => adaptApiResponse(
+					config, q, res, showDescription
+				) );
 			return {
 				abort: result.abort,
 				fetch: searchResponsePromise
diff --git a/tests/integration-qunit/integration.test.js b/tests/integration-qunit/integration.test.js
index 1f2a7b913..10dc74047 100644
--- a/tests/integration-qunit/integration.test.js
+++ b/tests/integration-qunit/integration.test.js
@@ -7,7 +7,7 @@ const clientPreferences = require( 'skins.vector.clientPreferences' );
  * This should only be used to test APIs that Vector depends on to work.
  * For unit tests please see tests/jest.
  */
-QUnit.module( 'Vector (integration)', function () {
+QUnit.module( 'Vector (integration)', () => {
 	QUnit.test( 'Client preferences: Behaves same for all users', function ( assert ) {
 		const sandbox = this.sandbox;
 		const helper = ( feature, isNamedReturnValue ) => {
diff --git a/tests/jest/App.test.js b/tests/jest/App.test.js
index 01222f41f..f2e0391ca 100644
--- a/tests/jest/App.test.js
+++ b/tests/jest/App.test.js
@@ -12,23 +12,21 @@ const defaultProps = {
 	searchQuery: ''
 };
 
-const mount = ( /** @type {Object} */ customProps ) => {
-	return VueTestUtils.shallowMount( App, {
-		props: Object.assign( {}, defaultProps, customProps ),
-		global: {
-			mocks: {
-				$i18n: ( /** @type {string} */ str ) => ( {
-					text: () => str
-				} )
-			},
-			directives: {
-				'i18n-html': ( el, binding ) => {
-					el.innerHTML = `${ binding.arg } (${ binding.value })`;
-				}
+const mount = ( /** @type {Object} */ customProps ) => VueTestUtils.shallowMount( App, {
+	props: Object.assign( {}, defaultProps, customProps ),
+	global: {
+		mocks: {
+			$i18n: ( /** @type {string} */ str ) => ( {
+				text: () => str
+			} )
+		},
+		directives: {
+			'i18n-html': ( el, binding ) => {
+				el.innerHTML = `${ binding.arg } (${ binding.value })`;
 			}
 		}
-	} );
-};
+	}
+} );
 
 describe( 'App', () => {
 	it( 'renders a typeahead search component', () => {
diff --git a/tests/jest/pinnableElement.test.js b/tests/jest/pinnableElement.test.js
index fcddc5a9f..6182e240d 100644
--- a/tests/jest/pinnableElement.test.js
+++ b/tests/jest/pinnableElement.test.js
@@ -29,9 +29,7 @@ let pinnedStatus = false;
 features.toggle = jest.fn( () => {
 	pinnedStatus = !pinnedStatus;
 } );
-features.isEnabled = jest.fn( () => {
-	return pinnedStatus;
-} );
+features.isEnabled = jest.fn( () => pinnedStatus );
 
 const simpleData = {
 	'is-pinned': false,
diff --git a/tests/jest/skins.vector.clientPreferences.test.js b/tests/jest/skins.vector.clientPreferences.test.js
index 93e3ddb0c..760277e54 100644
--- a/tests/jest/skins.vector.clientPreferences.test.js
+++ b/tests/jest/skins.vector.clientPreferences.test.js
@@ -32,11 +32,9 @@ describe( 'clientPreferences', () => {
 		} ) );
 	} );
 
-	test( 'render empty', () => {
-		return clientPreferences.render( '#cp', {} ).then( () => {
-			expect( cp.innerHTML ).toMatchSnapshot();
-		} );
-	} );
+	test( 'render empty', () => clientPreferences.render( '#cp', {} ).then( () => {
+		expect( cp.innerHTML ).toMatchSnapshot();
+	} ) );
 
 	test( 'render font size', () => {
 		document.documentElement.setAttribute( 'class', 'vector-feature-custom-font-size-clientpref-2' );
diff --git a/tests/jest/skins.vector.es6/main.test.js b/tests/jest/skins.vector.es6/main.test.js
index 978139139..7550e43c3 100644
--- a/tests/jest/skins.vector.es6/main.test.js
+++ b/tests/jest/skins.vector.es6/main.test.js
@@ -90,9 +90,7 @@ describe( 'main.js', () => {
 						isInBucket: () => true,
 						isInSample: () => true,
 						getBucket: () => 'bucket',
-						isInTreatmentBucket: () => {
-							return isUserInTreatmentBucket;
-						}
+						isInTreatmentBucket: () => isUserInTreatmentBucket
 					} )
 				);
 				expect( result ).toMatchObject( expectedResult );
@@ -117,21 +115,18 @@ describe( 'Table of contents re-rendering', () => {
 	const mockMwHook = () => {
 		/** @type {Object.<string, Function>} */
 		const callback = {};
-		jest.spyOn( mw, 'hook' ).mockImplementation( ( name ) => {
+		jest.spyOn( mw, 'hook' ).mockImplementation( ( name ) => ( {
+			add: function ( fn ) {
+				callback[ name ] = fn;
 
-			return {
-				add: function ( fn ) {
-					callback[ name ] = fn;
-
-					return this;
-				},
-				fire: ( data ) => {
-					if ( callback[ name ] ) {
-						callback[ name ]( data );
-					}
+				return this;
+			},
+			fire: ( data ) => {
+				if ( callback[ name ] ) {
+					callback[ name ]( data );
 				}
-			};
-		} );
+			}
+		} ) );
 	};
 
 	afterEach( () => {
diff --git a/tests/jest/skins.vector.js/menuTabs.test.js b/tests/jest/skins.vector.js/menuTabs.test.js
index f11e3aab0..0915b2958 100644
--- a/tests/jest/skins.vector.js/menuTabs.test.js
+++ b/tests/jest/skins.vector.js/menuTabs.test.js
@@ -4,20 +4,18 @@ describe( 'menuTabs', () => {
 	beforeEach( () => {
 		/** @type {Function} */
 		let callback;
-		jest.spyOn( mw, 'hook' ).mockImplementation( () => {
-			return {
-				add: function ( fn ) {
-					callback = fn;
+		jest.spyOn( mw, 'hook' ).mockImplementation( () => ( {
+			add: function ( fn ) {
+				callback = fn;
 
-					return this;
-				},
-				fire: ( data ) => {
-					if ( callback ) {
-						callback( data );
-					}
+				return this;
+			},
+			fire: ( data ) => {
+				if ( callback ) {
+					callback( data );
 				}
-			};
-		} );
+			}
+		} ) );
 
 	} );
 
diff --git a/tests/jest/tableOfContents.test.js b/tests/jest/tableOfContents.test.js
index 0adcf8b14..7b36416de 100644
--- a/tests/jest/tableOfContents.test.js
+++ b/tests/jest/tableOfContents.test.js
@@ -182,9 +182,7 @@ describe( 'Table of contents', () => {
 			expect( onToggleClick ).toBeCalled();
 		} );
 		test( 'for onHashChange', () => {
-			mw.util.getTargetFromFragment = jest.fn().mockImplementation( ( hash ) => {
-				return hash === 'toc-foo' ? fooSection : null;
-			} );
+			mw.util.getTargetFromFragment = jest.fn().mockImplementation( ( hash ) => hash === 'toc-foo' ? fooSection : null );
 			mount();
 
 			// Jest doesn't trigger a hashchange event when setting a hash location.
@@ -273,9 +271,7 @@ describe( 'Table of contents', () => {
 
 	describe( 'when the hash fragment changes', () => {
 		test( 'expands and activates corresponding section', () => {
-			mw.util.getTargetFromFragment = jest.fn().mockImplementation( ( hash ) => {
-				return hash === 'toc-qux' ? quxSection : null;
-			} );
+			mw.util.getTargetFromFragment = jest.fn().mockImplementation( ( hash ) => hash === 'toc-qux' ? quxSection : null );
 			toc = mount( { 'vector-is-collapse-sections-enabled': true } );
 			expect(
 				quxSection.classList.contains( toc.ACTIVE_SECTION_CLASS )
@@ -316,15 +312,13 @@ describe( 'Table of contents', () => {
 			jest.spyOn( mw.loader, 'using' ).mockImplementation( () => Promise.resolve() );
 			mw.template.getCompiler = () => {};
 			jest.spyOn( mw, 'message' ).mockImplementation( ( msg ) => {
-				const msgFactory = ( /** @type {string} */ text ) => {
-					return {
-						parse: () => '',
-						plain: () => '',
-						escaped: () => '',
-						exists: () => true,
-						text: () => text
-					};
-				};
+				const msgFactory = ( /** @type {string} */ text ) => ( {
+					parse: () => '',
+					plain: () => '',
+					escaped: () => '',
+					exists: () => true,
+					text: () => text
+				} );
 				switch ( msg ) {
 					case 'vector-toc-beginning':
 						return msgFactory( 'Beginning' );
@@ -333,21 +327,13 @@ describe( 'Table of contents', () => {
 				}
 
 			} );
-			jest.spyOn( mw.template, 'getCompiler' ).mockImplementation( () => {
-				return {
-					compile: () => {
-						return {
-							render: ( /** @type {Object} */ data ) => {
-								return {
-									html: () => {
-										return render( data );
-									}
-								};
-							}
-						};
-					}
-				};
-			} );
+			jest.spyOn( mw.template, 'getCompiler' ).mockImplementation( () => ( {
+				compile: () => ( {
+					render: ( /** @type {Object} */ data ) => ( {
+						html: () => render( data )
+					} )
+				} )
+			} ) );
 
 			toc = mount();
 
diff --git a/tests/jest/urlGenerator.test.js b/tests/jest/urlGenerator.test.js
index 5da912a1f..63cd382ba 100644
--- a/tests/jest/urlGenerator.test.js
+++ b/tests/jest/urlGenerator.test.js
@@ -22,9 +22,7 @@ describe( 'urlGenerator', () => {
 
 		test( 'custom params, articlePath', () => {
 			const config = {
-				get: jest.fn().mockImplementation( ( _key, fallback ) => {
-					return fallback;
-				} ),
+				get: jest.fn().mockImplementation( ( _key, fallback ) => fallback ),
 				set: jest.fn()
 			};