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import { sharedPromiseSettlementWaiters } from './promise-settlement-waiters'

export function abortSignalReason(signal: AbortSignal): Error {

if (signal.reason instanceof Error) {

return signal.reason

}

return Object.assign(new Error('The operation was aborted.'), { name: 'AbortError' })

}

/** The signal's own reason, thrown: the abort itself, not a failure it raced. */

export function isAbortSignalReason(signal: AbortSignal | undefined, error: unknown): boolean {

return signal?.aborted === true && error === abortSignalReason(signal)

}

export function throwIfSignalAborted(signal?: AbortSignal): void {

if (signal?.aborted) {

throw abortSignalReason(signal)

}

export function waitForPromiseWithSignal<T>(promise: Promise<T>, signal?: AbortSignal): Promise<T> {

if (!signal) {

return promise

}

return sharedPromiseSettlementWaiters(promise).wait({

signal,

deferSettled: true,

createAbortError: () => abortSignalReason(signal)

})

}