API Reference > presentation-common > PresentationRules > ChildNodeSpecificationBase > hideExpression hideExpression hideExpression: undefined | string An ECExpression which indicates whether a node should be hidden or not. note While the attribute provides much flexibility, it also has performance implications - it's strongly suggested to first consider using instanceFilter, hideNodesInHierarchy or hideIfNoChildren and only use hideExpression if none of them are sufficient. Defined in presentation/common/src/presentation-common/rules/hierarchy/ChildNodeSpecification.ts Line 77 Last Updated: 11 June, 2024