Quote v2: update how attrs are registered (#39729)

packages/block-library/package.json

@@ -29,7 +29,8 @@
 		"src/**/*.scss",
 		"src/navigation-link/index.js",
 		"src/template-part/index.js",
-		"src/query/index.js"
+		"src/query/index.js",
+		"src/quote/v2/index.js"
 	],
 	"dependencies": {
 		"@babel/runtime": "^7.16.0",

packages/block-library/src/quote/v2/index.js

@@ -3,18 +3,14 @@
  */
 import { __ } from '@wordpress/i18n';
 import { quote as icon } from '@wordpress/icons';
+import { addFilter } from '@wordpress/hooks';
 
 /**
  * Internal dependencies
  */
-import metadata from './block.json';
 import edit from './edit';
 import save from './save';
 
-const { name } = metadata;
-
-export { metadata, name };
-
 const settings = {
 	icon,
 	example: {
@@ -35,3 +31,46 @@ const settings = {
 };
 
 export default settings;
+
+/**
+ * This function updates the attributes for the quote v2.
+ * This should be moved to block.json when v2 becomes the default.
+ *
+ * @param {Array}  blockSettings The settings of the block to be registered.
+ * @param {string} blockName     The name of the block to be registered.
+ * @return {Array} New settings.
+ */
+function registerQuoteV2Attributes( blockSettings, blockName ) {
+	if ( ! window?.__experimentalEnableQuoteBlockV2 ) {
+		return blockSettings;
+	}
+
+	if ( blockName !== 'core/quote' ) {
+		return blockSettings;
+	}
+
+	// Register the new attribute.
+	Object.assign( blockSettings.attributes, {
+		attribution: {
+			type: 'string',
+			source: 'html',
+			selector: 'figcaption',
+			default: '',
+			__experimentalRole: 'content',
+		},
+	} );
+
+	// Deregister the old ones.
+	delete blockSettings.attributes.value;
+	delete blockSettings.attributes.citation;
+
+	return blockSettings;
+}
+
+// Importing this file includes side effects.
+// This has been declared in block-library/package.json under sideEffects.
+addFilter(
+	'blocks.registerBlockType',
+	'core/quote/v2-attributes',
+	registerQuoteV2Attributes
+);