API Reference > ecschema-metadata > Diagnostic > BaseDiagnostic > constructor constructor Method Initializes a new BaseDiagnostic. BaseDiagnostic<TYPE extends AnyECType, ARGS extends any[]>(ecDefinition: TYPE, messageArgs?: ARGS, category: DiagnosticCategory = DiagnosticCategory.Error): BaseDiagnostic<TYPE, ARGS> Parameter Type Description ecDefinition TYPE The EC object to associate with the diagnostic. messageArgs ARGS The arguments used when formatting the diagnostic message. category DiagnosticCategory The DiagnosticCategory to associate with the diagnostic, Error by default. Returns - BaseDiagnostic<TYPE, ARGS> Defined in core/ecschema-metadata/src/Validation/Diagnostic.ts Line 94 Last Updated: 11 June, 2024