@dfinity/assets/lib/esm/utils/limit.js

JavaScript and TypeScript library to manage assets on the Internet Computer

/**
 * Minimal promise executor with concurrency limit implementation
 * @param concurrency Maximum number of promises executed concurrently
 */
export const limit = (concurrency) => {
    const queue = [];
    let active = 0;
    const next = () => {
        if (active < concurrency && queue.length > 0) {
            active++;
            const { fn, resolve, reject } = queue.shift() ?? {};
            fn?.()
                .then(resolve)
                .catch(reject)
                .then(() => {
                active--;
                next();
            });
        }
    };
    return (fn) => new Promise((resolve, reject) => {
        queue.push({ fn, resolve, reject });
        next();
    });
};
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