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diff --git a/lib/public/IInitialStateService.php b/lib/public/IInitialStateService.php
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+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP;
+
+use Closure;
+
+/**
+ * @since 16.0.0
+ * @deprecated 21 Use {@see \OCP\AppFramework\Services\IInitialState} or {@see \OCP\AppFramework\Services\InitialStateProvider}
+ * @see \OCP\AppFramework\Services\IInitialState
+ */
+interface IInitialStateService {
+	/**
+	 * Allows an app to provide its initial state to the template system.
+	 * Use this if you know your initial state still be used for example if
+	 * you are in the render function of you controller.
+	 *
+	 * @since 16.0.0
+	 *
+	 * @param string $appName
+	 * @param string $key
+	 * @param bool|int|float|string|array|\JsonSerializable $data
+	 *
+	 * @deprecated 21 Use {@see \OCP\AppFramework\Services\IInitialState} or {@see \OCP\AppFramework\Services\InitialStateProvider}
+	 * @see \OCP\AppFramework\Services\IInitialState::provideInitialState()
+	 */
+	public function provideInitialState(string $appName, string $key, $data): void;
+
+	/**
+	 * Allows an app to provide its initial state via a lazy method.
+	 * This will call the closure when the template is being generated.
+	 * Use this if your app is injected into pages. Since then the render method
+	 * is not called explicitly. But we do not want to load the state on webdav
+	 * requests for example.
+	 *
+	 * @since 16.0.0
+	 *
+	 * @param string $appName
+	 * @param string $key
+	 * @param Closure $closure returns a primitive or an object that implements JsonSerializable
+	 *
+	 * @deprecated 21 Use {@see \OCP\AppFramework\Services\IInitialState} or {@see \OCP\AppFramework\Services\InitialStateProvider}
+	 * @see \OCP\AppFramework\Services\IInitialState::provideLazyInitialState()
+	 */
+	public function provideLazyInitialState(string $appName, string $key, Closure $closure): void;
+}