a

backend/node_modules/mongoose/lib/helpers/parallelLimit.js

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+'use strict';
+
+module.exports = parallelLimit;
+
+/*!
+ * ignore
+ */
+
+async function parallelLimit(params, fn, limit) {
+  if (limit <= 0) {
+    throw new Error('Limit must be positive');
+  }
+
+  if (params.length === 0) {
+    return [];
+  }
+
+  const results = [];
+  const executing = new Set();
+
+  for (let index = 0; index < params.length; index++) {
+    const param = params[index];
+    const p = fn(param, index);
+    results.push(p);
+
+    executing.add(p);
+
+    const clean = () => executing.delete(p);
+    p.then(clean).catch(clean);
+
+    if (executing.size >= limit) {
+      await Promise.race(executing);
+    }
+  }
+
+  return Promise.all(results);
+}