- OnErrorEventHandlerNonNull(
 event: string | Event,
 source?: string,
 lineno?: number,
 colno?: number,
 error?: Error,
 ): any
- Parameters- event: string | Event
- Optionalsource: string
- Optionallineno: number
- Optionalcolno: number
- Optionalerror: Error
 
- Returns any