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文件: /usr/local/n/versions/node/12.18.0/lib/node_modules/npm/node_modules/p-limit/index.js
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'use strict'; const pTry = require('p-try'); module.exports = concurrency => { if (concurrency < 1) { throw new TypeError('Expected `concurrency` to be a number from 1 and up'); } const queue = []; let activeCount = 0; const next = () => { activeCount--; if (queue.length > 0) { queue.shift()(); } }; return fn => new Promise((resolve, reject) => { const run = () => { activeCount++; pTry(() => fn()).then( val => { resolve(val); next(); }, err => { reject(err); next(); } ); }; if (activeCount < concurrency) { run(); } else { queue.push(run); } }); };
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