diff --git a/.jshintignore b/.jshintignore
deleted file mode 100644
index e4e06258aa..0000000000
--- a/.jshintignore
+++ /dev/null
@@ -1,8 +0,0 @@
-# SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
-# SPDX-FileCopyrightText: 2016 ownCloud, Inc.
-# SPDX-License-Identifier: AGPL-3.0-only
-node_modules
-l10n
-vendor
-js/vendor
-js/mail.min.js
diff --git a/.jshintrc b/.jshintrc
deleted file mode 100644
index 6064554999..0000000000
--- a/.jshintrc
+++ /dev/null
@@ -1,29 +0,0 @@
-{
-	"camelcase": false,
-	"eqeqeq": true,
-	"immed": true,
-	"latedef": false,
-	"noarg": true,
-	"nonbsp": true,
-	"undef": true,
-	"unused": true,
-	"trailing": true,
-	"maxparams": 5,
-	"curly": true,
-	"maxlen": 120,
-	"indent": 4,
-	"browser": true,
-	"globals": {
-		"console": true,
-		"it": true,
-		"xit": true,
-		"expect": true,
-		"describe": true,
-		"define": true,
-		"beforeEach": true,
-		"afterEach": true,
-		"require": true
-	},
-	"esversion": 6,
-	"asi": true
-}
diff --git a/.nextcloudignore b/.nextcloudignore
index a2ab416752..e07c153285 100644
--- a/.nextcloudignore
+++ b/.nextcloudignore
@@ -17,10 +17,6 @@ codecov.yml
 .hg
 /issue_template.md
 /jest.config.js
-/.jscsrc
-/.jshintignore
-/.jshintrc
-/karma.conf.js
 /krankerl.toml
 /l10n/no-php
 /.tx
@@ -30,7 +26,6 @@ codecov.yml
 /package.json
 /package-lock.json
 /phpunit*xml
-/postcss.config.js
 /psalm.xml
 /rector.php
 /renovate.json
diff --git a/Gruntfile.js b/Gruntfile.js
deleted file mode 100644
index fef26e8b9b..0000000000
--- a/Gruntfile.js
+++ /dev/null
@@ -1,37 +0,0 @@
-/**
- * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
- * SPDX-License-Identifier: AGPL-3.0-or-later
- */
-/* global module */
-module.exports = function(grunt) {
-	// Project configuration.
-	grunt.initConfig({
-		jshint: {
-			options: {
-				jshintrc: '.jshintrc'
-			},
-			all: ['Gruntfile.js', 'js/*.js', 'js/models/*.js', 'js/views/*.js',
-				'!js/build/build.js', '!js/webpack.*.js']
-		},
-		karma: {
-			unit: {
-				configFile: 'karma.conf.js',
-				autoWatch: true
-			},
-			continuous: {
-				configFile: 'karma.conf.js',
-				browsers: ['PhantomJS'],
-				singleRun: true,
-			}
-		}
-	});
-
-	// jshint
-	grunt.loadNpmTasks('grunt-contrib-jshint');
-
-	// Karma unit tests
-	grunt.loadNpmTasks('grunt-karma');
-
-	// Default task
-	grunt.registerTask('default', ['jshint', 'karma:continuous']);
-};
diff --git a/karma.conf.js b/karma.conf.js
deleted file mode 100644
index 34f38585cd..0000000000
--- a/karma.conf.js
+++ /dev/null
@@ -1,76 +0,0 @@
-/**
- * SPDX-FileCopyrightText: 2016-2019 Nextcloud GmbH and Nextcloud contributors
- * SPDX-FileCopyrightText: 2015-2016 owncloud, Inc.
- * SPDX-License-Identifier: AGPL-3.0-or-later
- */
-// Karma configuration
-// Generated on Tue Sep 01 2015 13:54:51 GMT+0200 (CEST)
-
-var webpackConfig = require('./js/webpack.dev.config.js');
-
-webpackConfig.entry = './js/tests/test_init.js';
-webpackConfig.module.rules.push({
-	test: /\.js$/,
-	exclude: /init\.js/
-});
-
-module.exports = function (config) {
-	config.set({
-		// frameworks to use
-		// available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-		frameworks: ['jasmine-ajax', 'jasmine', 'sinon'],
-
-		files: [
-			{pattern: 'js/tests/test-main.js', included: true},
-			// all files ending in "_test"
-			{pattern: 'js/tests/*_spec.js', watched: false},
-			{pattern: 'js/tests/**/*_spec.js', watched: false},
-			{pattern: 'js/build/build.js', included: false}
-		],
-
-		// list of files to exclude
-		exclude: [
-			'js/webpack.*.js',
-			'js/init.js'
-		],
-		// preprocess matching files before serving them to the browser
-		// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
-		preprocessors: {
-			'js/**[!vendor]/*[!spec].js': ['coverage', 'sourcemap'],
-			// add webpack as preprocessor
-			'js/tests/*_spec.js': ['webpack', 'sourcemap'],
-			'js/tests/**/*_spec.js': ['webpack', 'sourcemap']
-		},
-
-		webpackMiddleware: {
-			// webpack-dev-middleware configuration
-			// i. e.
-			stats: 'errors-only'
-		},
-
-		// test results reporter to use
-		// possible values: 'dots', 'progress'
-		// available reporters: https://npmjs.org/browse/keyword/karma-reporter
-		reporters: ['progress', 'coverage'],
-		coverageReporter: {
-			type: 'lcov',
-			dir: 'coverage/'
-		},
-		// web server port
-		port: 9876,
-		// enable / disable colors in the output (reporters and logs)
-		colors: true,
-		// level of logging
-		// possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
-		logLevel: config.LOG_INFO,
-		// enable / disable watching file and executing tests whenever any file changes
-		autoWatch: true,
-		// start these browsers
-		// available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-		browsers: ['PhantomJS'],
-		// Continuous Integration mode
-		// if true, Karma captures browsers, runs the tests and exits
-		singleRun: false,
-		webpack: webpackConfig
-	});
-};
diff --git a/postcss.config.js b/postcss.config.js
deleted file mode 100644
index 0c640e777f..0000000000
--- a/postcss.config.js
+++ /dev/null
@@ -1,9 +0,0 @@
-/**
- * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
- * SPDX-License-Identifier: AGPL-3.0-or-later
- */
-module.exports = {
-  plugins: {
-    autoprefixer: {}
-  }
-}