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PR-URL: https://github.com/nodejs/node/pull/12936 Reviewed-By: Anna Henningsen <anna@addaleax.net>
35 lines
782 B
Markdown
35 lines
782 B
Markdown
# promise-inflight
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One promise for multiple requests in flight to avoid async duplication
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## USAGE
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```javascript
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const inflight = require('promise-inflight')
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// some request that does some stuff
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function req(key) {
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// key is any random string. like a url or filename or whatever.
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return inflight(key, () => {
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// this is where you'd fetch the url or whatever
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return Promise.delay(100)
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})
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}
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// only assigns a single setTimeout
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// when it dings, all thens get called with the same result. (There's only
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// one underlying promise.)
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req('foo').then(…)
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req('foo').then(…)
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req('foo').then(…)
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req('foo').then(…)
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```
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## SEE ALSO
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* [inflight](https://npmjs.com/package/inflight) - For the callback based function on which this is based.
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## STILL NEEDS
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Tests!
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