sf-decomposer/lib/helpers/pLimit.js

Split large Salesforce metadata files into version-control-friendly pieces and rebuild deployment-ready files.

'use strict';
/**
 * Creates a concurrency limiter that ensures at most `concurrency` async tasks
 * run simultaneously. Returns a scheduler function with the same call signature
 * as the p-limit package: `limit(fn, ...args)` enqueues the task and returns a
 * Promise that resolves/rejects with the task's result.
 */
export function pLimit(concurrency) {
    let active = 0;
    const queue = [];
    function next() {
        if (queue.length === 0 || active >= concurrency)
            return;
        active++;
        const run = queue.shift();
        run();
    }
    return function limit(fn) {
        return new Promise((resolve, reject) => {
            queue.push(() => {
                Promise.resolve()
                    .then(() => fn())
                    .then(resolve, reject)
                    .finally(() => {
                    active--;
                    next();
                });
            });
            next();
        });
    };
}
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