Function defined

defined<T>(x?: T, code?: string, message?: string): T
Check that x is of type T and not undefined. If x is undefined, throw a RuntimeError with the optionally provided error code and message.
Type Parameters
- T
Parameters
- Optionalx: T
- code: string = 'undefined'
- message: string = ''
Returns T
- Defined in vexflow/src/util.ts:37