This library introduce a very important concept that will be used in more complexes Aster libraries: The AbortToken.
AbortToken allow to cancel cascading asynchronous calls and abort them as soon as possible and change the behavior:
async function update({ data, children }: CustomData, token: AbortToken): Promise<boolean> {
// token.signal will allow to use native AbortController signal
// Aborting during the request will reject the fetch call
const response = await fetch("/data/", { method: "POST", body: JSON.stringify(data), signal: token.signal });
const created = await response.json();
// If the token is abort we choose to remove the data
if(token.aborted) {
await fetch(`/data/${created.id}`, { method: "DELETE" });
return false;
}
// If not, we append its children
await fetch(`/data/${created.id}/children`, { method: "POST", body: JSON.stringify(children) });
return true;
}