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"readme": "# p-queue [](https://travis-ci.org/sindresorhus/p-queue) [](https://codecov.io/gh/sindresorhus/p-queue)\n\n> Promise queue with concurrency control\n\nUseful for rate-limiting async (or sync) operations. For example, when interacting with a REST API or when doing CPU/memory intensive tasks.\n\n\n## Install\n\n```\n$ npm install p-queue\n```\n\n\n## Usage\n\nHere we run only one promise at the time. For example, set `concurrency` to 4 to run four promises at the same time.\n\n```js\nconst PQueue = require('p-queue');\nconst got = require('got');\n\nconst queue = new PQueue({concurrency: 1});\n\n(async () => {\n\tawait queue.add(() => got('sindresorhus.com'));\n\tconsole.log('Done: sindresorhus.com');\n})();\n\n(async () => {\n\tawait queue.add(() => got('ava.li'));\n\tconsole.log('Done: ava.li');\n})();\n\n(async () => {\n\tconst task = await getUnicornTask();\n\tawait queue.add(task);\n\tconsole.log('Done: Unicorn task');\n})();\n```\n\n\n## API\n\n### PQueue([options])\n\nReturns a new `queue` instance, which is an [`EventEmitter3`](https://github.com/primus/eventemitter3) subclass.\n\n#### options\n\nType: `Object`\n\n##### concurrency\n\nType: `number`
\nDefault: `Infinity`
\nMinimum: `1`\n\nConcurrency limit.\n\n##### autoStart\n\nType: `boolean`
\nDefault: `true`\n\nWhether queue tasks within concurrency limit, are auto-executed as soon as they're added.\n\n##### queueClass\n\nType: `Function`\n\nClass with a `enqueue` and `dequeue` method, and a `size` getter. See the [Custom QueueClass](#custom-queueclass) section.\n\n##### intervalCap\n\nType: `number`
\nDefault: `Infinity`
\nMinimum: `1`\n\nThe max number of runs in the given interval of time.\n\n##### interval\n\nType: `number`
\nDefault: `0`
\nMinimum: `0`\n\nThe length of time in milliseconds before the interval count resets. Must be finite.\n\n##### carryoverConcurrencyCount\n\nType: `boolean`
\nDefault: `false`\n\nWhether the task must finish in the given interval or will be carried over into the next interval count.\n\n### queue\n\n`PQueue` instance.\n\n#### .add(fn, [options])\n\nAdds a sync or async task to the queue. Always returns a promise.\n\n##### fn\n\nType: `Function`\n\nPromise-returning/async function.\n\n#### options\n\nType: `Object`\n\n##### priority\n\nType: `number`
\nDefault: `0`\n\nPriority of operation. Operations with greater priority will be scheduled first.\n\n#### .addAll(fns, [options])\n\nSame as `.add()`, but accepts an array of sync or async functions and returns a promise that resolves when all functions are resolved.\n\n#### .pause()\n\nPut queue execution on hold.\n\n#### .start()\n\nStart (or resume) executing enqueued tasks within concurrency limit. No need to call this if queue is not paused (via `options.autoStart = false` or by `.pause()` method.)\n\n#### .onEmpty()\n\nReturns a promise that settles when the queue becomes empty.\n\nCan be called multiple times. Useful if you for example add additional items at a later time.\n\n#### .onIdle()\n\nReturns a promise that settles when the queue becomes empty, and all promises have completed; `queue.size === 0 && queue.pending === 0`.\n\nThe difference with `.onEmpty` is that `.onIdle` guarantees that all work from the queue has finished. `.onEmpty` merely signals that the queue is empty, but it could mean that some promises haven't completed yet.\n\n#### .clear()\n\nClear the queue.\n\n#### .size\n\nSize of the queue.\n\n#### .pending\n\nNumber of pending promises.\n\n#### .isPaused\n\nWhether the queue is currently paused.\n\n\n## Events\n\n#### active\n\nEmitted as each item is processed in the queue for the purpose of tracking progress.\n\n```js\nconst delay = require('delay');\nconst PQueue = require('p-queue');\n\nconst queue = new PQueue({concurrency: 2});\n\nlet count = 0;\nqueue.on('active', () => {\n\tconsole.log(`Working on item #${++count}. Size: ${queue.size} Pending: ${queue.pending}`);\n});\n\nqueue.add(() => Promise.resolve());\nqueue.add(() => delay(2000));\nqueue.add(() => Promise.resolve());\nqueue.add(() => Promise.resolve());\nqueue.add(() => delay(500));\n```\n\n\n## Advanced example\n\nA more advanced example to help you understand the flow.\n\n```js\nconst delay = require('delay');\nconst PQueue = require('p-queue');\n\nconst queue = new PQueue({concurrency: 1});\n\n(async () => {\n\tawait delay(200);\n\n\tconsole.log(`8. Pending promises: ${queue.pending}`);\n\t//=> '8. Pending promises: 0'\n\n\t(async () => {\n\t\tawait queue.add(async () => 'π');\n\t\tconsole.log('11. Resolved')\n\t})();\n\n\tconsole.log('9. Added π');\n\n\tconsole.log(`10. Pending promises: ${queue.pending}`);\n\t//=> '10. Pending promises: 1'\n\n\tawait queue.onIdle();\n\tconsole.log('12. All work is done');\n})();\n\n(async () => {\n\tawait queue.add(async () => 'π¦');\n\tconsole.log('5. Resolved')\n})();\nconsole.log('1. Added π¦');\n\n(async () => {\n\tawait queue.add(async () => 'π΄');\n\tconsole.log('6. Resolved')\n})();\nconsole.log('2. Added π΄');\n\n(async () => {\n\tawait queue.onEmpty();\n\tconsole.log('7. Queue is empty');\n})();\n\nconsole.log(`3. Queue size: ${queue.size}`);\n//=> '3. Queue size: 1`\n\nconsole.log(`4. Pending promises: ${queue.pending}`);\n//=> '4. Pending promises: 1'\n```\n\n```\n$ node example.js\n1. Added π¦\n2. Added π΄\n3. Queue size: 1\n4. Pending promises: 1\n5. Resolved π¦\n6. Resolved π΄\n7. Queue is empty\n8. Pending promises: 0\n9. Added π\n10. Pending promises: 1\n11. Resolved π\n12. All work is done\n```\n\n\n## Custom QueueClass\n\nFor implementing more complex scheduling policies, you can provide a QueueClass in the options:\n\n```js\nclass QueueClass {\n\tconstructor() {\n\t\tthis._queue = [];\n\t}\n\tenqueue(run, options) {\n\t\tthis._queue.push(run);\n\t}\n\tdequeue() {\n\t\treturn this._queue.shift();\n\t}\n\tget size() {\n\t\treturn this._queue.length;\n\t}\n}\n```\n\n`p-queue` will call corresponding methods to put and get operations from this queue.\n\n\n## Related\n\n- [p-limit](https://github.com/sindresorhus/p-limit) - Run multiple promise-returning & async functions with limited concurrency\n- [p-throttle](https://github.com/sindresorhus/p-throttle) - Throttle promise-returning & async functions\n- [p-debounce](https://github.com/sindresorhus/p-debounce) - Debounce promise-returning & async functions\n- [p-all](https://github.com/sindresorhus/p-all) - Run promise-returning & async functions concurrently with optional limited concurrency\n- [Moreβ¦](https://github.com/sindresorhus/promise-fun)\n\n\n## License\n\nMIT\n",
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