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wp-includes/blocks/block/block.json

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+{
+	"$schema": "https://schemas.wp.org/trunk/block.json",
+	"apiVersion": 2,
+	"name": "core/block",
+	"title": "Reusable block",
+	"category": "reusable",
+	"description": "Create and save content to reuse across your site. Update the block, and the changes apply everywhere it’s used.",
+	"textdomain": "default",
+	"attributes": {
+		"ref": {
+			"type": "number"
+		}
+	},
+	"supports": {
+		"customClassName": false,
+		"html": false,
+		"inserter": false
+	},
+	"editorStyle": "wp-block-editor"
+}