diff --git a/wp-admin/includes/class-wp-screen.php b/wp-admin/includes/class-wp-screen.php
index 84cbd9164f..6798b1c5cf 100644
--- a/wp-admin/includes/class-wp-screen.php
+++ b/wp-admin/includes/class-wp-screen.php
@@ -181,6 +181,14 @@ final class WP_Screen {
 	 */
 	private $_screen_settings;
 
+	/**
+	 * Whether the screen is using the block editor.
+	 *
+	 * @since 5.0.0
+	 * @var bool
+	 */
+	public $is_block_editor = false;
+
 	/**
 	 * Fetches a screen object.
 	 *
@@ -399,6 +407,22 @@ final class WP_Screen {
 		return ( $admin == $this->in_admin );
 	}
 
+	/**
+	 * Sets or returns whether the block editor is loading on the current screen.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param bool $set Optional. Sets whether the block editor is loading on the current screen or not.
+	 * @return bool True if the block editor is being loaded, false otherwise.
+	 */
+	public function is_block_editor( $set = null ) {
+		if ( $set !== null ) {
+			$this->is_block_editor = (bool) $set;
+		}
+
+		return $this->is_block_editor;
+	}
+
 	/**
 	 * Sets the old string-based contextual help for the screen for backward compatibility.
 	 *
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 609344e718..5bcde7d35e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43776';
+$wp_version = '5.0-alpha-43777';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.