API Reference > ecschema-editing > Diagnostic > createSchemaItemDiagnosticClass createSchemaItemDiagnosticClass Function Beta Helper method for creating SchemaItemDiagnostic child classes. createSchemaItemDiagnosticClass<ITEM extends SchemaItem<ITEM>, ARGS extends any[]>(code: string, messageText: string): undefined Parameter Type Description code string The string that uniquely identifies the diagnostic in the format ':'. messageText string The message to associate with the diagnostic class. Defined in ecschema-editing/src/Validation/Diagnostic.ts Line 259 Last Updated: 11 June, 2024