assertOptionalKeyPresent()

function assertOptionalKeyPresent<E, K>(
   record, 
   key, 
   message): asserts record is E & Record<K, NonNullable<E[K]>>

Runtime assertion that an optional key is present.

This is useful for ensuring that optional environment variables are present before use, while still allowing us to omit them for un-related tasks.

Type Parameters

Type Parameter
E extends Partial<OptionalEnvironment>
K extends keyof OptionalEnvironment

Parameters

Parameter	Type
record	E
key	K
message	string

Returns

asserts record is E & Record<K, NonNullable<E[K]>>