repomix/lib/shared/asyncMap.js

A tool to pack repository contents to single file for AI consumption

export const mapWithConcurrency = async (items, concurrency, fn) => {
    if (!Number.isInteger(concurrency) || concurrency < 1) {
        throw new Error(`concurrency must be a positive integer (received ${concurrency})`);
    }
    if (items.length === 0) {
        return [];
    }
    const results = Array.from({ length: items.length });
    let nextIndex = 0;
    const worker = async () => {
        while (true) {
            const index = nextIndex++;
            if (index >= items.length)
                return;
            results[index] = await fn(items[index], index);
        }
    };
    const workerCount = Math.min(concurrency, items.length);
    await Promise.all(Array.from({ length: workerCount }, () => worker()));
    return results;
};