For tutorial: Create an abortable API using AbortController and AbortSignal

abortableSearchItems_before.ts

const abortSearchHandler = () => {
    throw new Error('searchAborted');
};

const abortableSearchItems = (
    searchString: string,
    signal: AbortSignal
): Promise<Item[]> => {
    if (signal.aborted) {
        throw new Error('searchAborted');
    }

    try {
        signal.addEventListener("abort", abortSearchHandler);
        
        return searchItemsAPI(searchString);
    } finally {
        signal.removeEventListener("abort", abortSearchHandler);
    }
};