sequence.jsā¢950 B
// Like Bash, we await both subprocesses. This is unlike some other shells which only await the destination subprocess.
// Like Bash with the `pipefail` option, if either subprocess fails, the whole pipe fails.
// Like Bash, if both subprocesses fail, we return the failure of the destination.
// This ensures both subprocesses' errors are present, using `error.pipedFrom`.
export const waitForBothSubprocesses = async subprocessPromises => {
const [
{status: sourceStatus, reason: sourceReason, value: sourceResult = sourceReason},
{status: destinationStatus, reason: destinationReason, value: destinationResult = destinationReason},
] = await subprocessPromises;
if (!destinationResult.pipedFrom.includes(sourceResult)) {
destinationResult.pipedFrom.push(sourceResult);
}
if (destinationStatus === 'rejected') {
throw destinationResult;
}
if (sourceStatus === 'rejected') {
throw sourceResult;
}
return destinationResult;
};