Perseus
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    TreeNode:
        | { content: string; id?: string; type: string; widgetType?: string }
        | {
            blockHighlight?: boolean;
            content: TreeNode;
            id?: undefined;
            insideTable: boolean;
            message: string;
            ruleName: string;
            severity: number;
            type: "lint";
            widgetType?: undefined;
        }

    TreeNode represents a node in a linted parse tree.