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event-loop-spinner\n\nTiny helper to prevent blocking Node.js event loop.\n\n## Example\n\n```typescript\nimport { eventLoopSpinner } from 'event-loop-spinner';\nasync function cpuIntensiveOperationHandler(hugeArray) {\n  for (const item of hugeArray) {\n    // ...\n    if (eventLoopSpinner.isStarving()) {\n      await eventLoopSpinner.spin();\n    }\n  }\n}\n```\n\n\n## Reading\n\n[Node.js: How even quick async functions can block the Event-Loop, starve I/O](https://snyk.io/blog/nodejs-how-even-quick-async-functions-can-block-the-event-loop-starve-io/)\n\n\n## How does this help?\n\nNode can only run one bit of JS at a time. While it is running this bit of JS, it does nothing else.\nIt doesn't fire timers. It doesn't accept TCP connections from clients.\n\nIn fact, Node doesn't even do these things when it finishes running one bit of JS. It prefers to\nimmediately run the next bit of JS. It does this for \"a while\".\n\nThis gives you two amazingly powerful ways to shoot yourself in the foot; it's great! Just like C++.\n\nThat is, if some node process either:\n * contains some JS code which runs for \"too long\", or\n * handles too many concurrent work items, resulting in lots of JS to run,\n\n..then it won't handle network requests, or let anyone else do any JS. This can result in the\napplication appearing unresponsive for seconds or minutes. (Yes, we really see minutes.)\n\n`event-loop-spinner` masks this problem. The `spin()` method allows Node to stop running this JS\nfunction, and its friends, and do some other JS, or do some IO. This significantly shortens the\ntime before more networking is done (i.e. a response is sent to a client), and/or other people's\nJS is run, improving responsiveness.\n","_attachments":{},"homepage":"https://github.com/snyk/eventloop-spinner#readme","bugs":{"url":"https://github.com/snyk/eventloop-spinner/issues"},"license":"Apache-2.0"}