fix issue with fetching initial post-meta in wordpress core version o…

…f gutenberg

src/js/stores/data/resolvers.ts

@@ -1,9 +1,15 @@
 import { select } from '@wordpress/data';
 
-import { SavedState } from './';
+import { SavedState, Style } from './';
 import { Actions } from './constants';
 import { fetchCitationStyles } from './controls';
 
+declare const ABT: Maybe<{
+    options: {
+        style: Style;
+    };
+}>;
+
 export function* getCitationStyles() {
     const styles = yield fetchCitationStyles();
     return {
@@ -33,7 +39,13 @@ function getSavedState(): SavedState {
         'core/editor',
     ).getCurrentPostAttribute('meta');
     if (!meta || !meta._abt_state) {
-        throw new Error('Unable to retrieve registered post meta for ABT');
+        if (!ABT) {
+            throw new Error('Could not resolve default citation style.');
+        }
+        return {
+            references: [],
+            style: ABT.options.style,
+        };
     }
     return JSON.parse(meta._abt_state);
 }

src/php/editor.php

@@ -33,6 +33,11 @@ function enqueue_scripts(): void {
 		wp_enqueue_script( get_handle( 'editor', 'script' ) );
 
 		init_editor_state( $post->ID );
+		wp_add_inline_script(
+			get_handle( 'editor-stores', 'script' ),
+			'var ABT = ABT || {};' .
+			'ABT.options = ' . wp_json_encode( get_option( ABT_OPTIONS_KEY ) ) . ';'
+		);
 	}
 }
 add_action( 'admin_enqueue_scripts', __NAMESPACE__ . '\enqueue_scripts' );