diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/interactivity-api/interactivity-api.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/interactivity-api/interactivity-api.php	Fri Sep 05 18:40:08 2025 +0200
@@ -0,0 +1,127 @@
+<?php
+/**
+ * Interactivity API: Functions and hooks
+ *
+ * @package WordPress
+ * @subpackage Interactivity API
+ * @since 6.5.0
+ */
+
+/**
+ * Retrieves the main WP_Interactivity_API instance.
+ *
+ * It provides access to the WP_Interactivity_API instance, creating one if it
+ * doesn't exist yet.
+ *
+ * @since 6.5.0
+ *
+ * @global WP_Interactivity_API $wp_interactivity
+ *
+ * @return WP_Interactivity_API The main WP_Interactivity_API instance.
+ */
+function wp_interactivity(): WP_Interactivity_API {
+	global $wp_interactivity;
+	if ( ! ( $wp_interactivity instanceof WP_Interactivity_API ) ) {
+		$wp_interactivity = new WP_Interactivity_API();
+	}
+	return $wp_interactivity;
+}
+
+/**
+ * Processes the interactivity directives contained within the HTML content
+ * and updates the markup accordingly.
+ *
+ * @since 6.5.0
+ *
+ * @param string $html The HTML content to process.
+ * @return string The processed HTML content. It returns the original content when the HTML contains unbalanced tags.
+ */
+function wp_interactivity_process_directives( string $html ): string {
+	return wp_interactivity()->process_directives( $html );
+}
+
+/**
+ * Gets and/or sets the initial state of an Interactivity API store for a
+ * given namespace.
+ *
+ * If state for that store namespace already exists, it merges the new
+ * provided state with the existing one.
+ *
+ * The namespace can be omitted inside derived state getters, using the
+ * namespace where the getter is defined.
+ *
+ * @since 6.5.0
+ * @since 6.6.0 The namespace can be omitted when called inside derived state getters.
+ *
+ * @param string $store_namespace The unique store namespace identifier.
+ * @param array  $state           Optional. The array that will be merged with the existing state for the specified
+ *                                store namespace.
+ * @return array The state for the specified store namespace. This will be the updated state if a $state argument was
+ *               provided.
+ */
+function wp_interactivity_state( ?string $store_namespace = null, array $state = array() ): array {
+	return wp_interactivity()->state( $store_namespace, $state );
+}
+
+/**
+ * Gets and/or sets the configuration of the Interactivity API for a given
+ * store namespace.
+ *
+ * If configuration for that store namespace exists, it merges the new
+ * provided configuration with the existing one.
+ *
+ * @since 6.5.0
+ *
+ * @param string $store_namespace The unique store namespace identifier.
+ * @param array  $config          Optional. The array that will be merged with the existing configuration for the
+ *                                specified store namespace.
+ * @return array The configuration for the specified store namespace. This will be the updated configuration if a
+ *               $config argument was provided.
+ */
+function wp_interactivity_config( string $store_namespace, array $config = array() ): array {
+	return wp_interactivity()->config( $store_namespace, $config );
+}
+
+/**
+ * Generates a `data-wp-context` directive attribute by encoding a context
+ * array.
+ *
+ * This helper function simplifies the creation of `data-wp-context` directives
+ * by providing a way to pass an array of data, which encodes into a JSON string
+ * safe for direct use as a HTML attribute value.
+ *
+ * Example:
+ *
+ *     <div <?php echo wp_interactivity_data_wp_context( array( 'isOpen' => true, 'count' => 0 ) ); ?>>
+ *
+ * @since 6.5.0
+ *
+ * @param array  $context         The array of context data to encode.
+ * @param string $store_namespace Optional. The unique store namespace identifier.
+ * @return string A complete `data-wp-context` directive with a JSON encoded value representing the context array and
+ *                the store namespace if specified.
+ */
+function wp_interactivity_data_wp_context( array $context, string $store_namespace = '' ): string {
+	return 'data-wp-context=\'' .
+		( $store_namespace ? $store_namespace . '::' : '' ) .
+		( empty( $context ) ? '{}' : wp_json_encode( $context, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP ) ) .
+		'\'';
+}
+
+/**
+ * Gets the current Interactivity API context for a given namespace.
+ *
+ * The function should be used only during directive processing. If the
+ * `$store_namespace` parameter is omitted, it uses the current namespace value
+ * on the internal namespace stack.
+ *
+ * It returns an empty array when the specified namespace is not defined.
+ *
+ * @since 6.6.0
+ *
+ * @param string $store_namespace Optional. The unique store namespace identifier.
+ * @return array The context for the specified store namespace.
+ */
+function wp_interactivity_get_context( ?string $store_namespace = null ): array {
+	return wp_interactivity()->get_context( $store_namespace );
+}