guardDefined()
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guardDefined()
Guards the value to be defined, not .
Type
A generic type variable Type
indicates captured type of the given via the and the parameter of the provided function type.
Payload
extends
object
=
object
The Payload
generic type variable constrained by indicates the type of optional parameter of the supplied function and optional parameter of the function from which it captures its value.
value: Defined<Type>
The value of generic type , undefined type captured from itself to guard against .
callback?: ResultCallback<Defined<Type>, Payload>
payload?: Payload
value is Defined<Type>
The optional callback of type with parameters, the that has been checked, the of this check, and of generic type variable with optional properties from the provided , to handle them before the return. By default, it uses function.
An optional of the generic type variable is assigned to the of the given function.
The return type is a as the result of its statement indicating the is a generic type that takes a generic type variable of value by default equal to the type captured from the supplied parameter excepts which changes to .
The return value is a indicating whether the is defined.