feat: validation error type #13
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mederka
approved these changes
Oct 5, 2023
| @@ -33,3 +33,9 @@ export type QueueStatus = | |||
| export function isQueueStatus(obj: any): obj is QueueStatus { | |||
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This is a type-predicate (formerly known as type-guard). So the function returns true/false during the runtime, but in build-time it gives the compiler information about the type, so:
const someUntypedJsonComingFromARequest = /* ... */
if (isQueueStatus(someUntypedJsonComingFromARequest)) {
// now the compiler knows that someUntypedJsonComingFromARequest is actually QueueStatus
}
https://www.typescriptlang.org/docs/handbook/2/narrowing.html#using-type-predicates
Does that clarify it?
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