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assertExists() function

Assert whether a value is neither null nor undefined

Signature:

export declare function assertExists<T>(val: T | undefined | null, valDescription: string): asserts val is T;

Parameters

Parameter	Type	Description
val	T | undefined | null	value to test
valDescription	string	a description of the meaning of this value (for a user-friendly assertion error)

Returns:

asserts val is T