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codeql-action/node_modules/inflight/README.md
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# inflight | |
Add callbacks to requests in flight to avoid async duplication | |
## USAGE | |
```javascript | |
var inflight = require('inflight') | |
// some request that does some stuff | |
function req(key, callback) { | |
// key is any random string. like a url or filename or whatever. | |
// | |
// will return either a falsey value, indicating that the | |
// request for this key is already in flight, or a new callback | |
// which when called will call all callbacks passed to inflightk | |
// with the same key | |
callback = inflight(key, callback) | |
// If we got a falsey value back, then there's already a req going | |
if (!callback) return | |
// this is where you'd fetch the url or whatever | |
// callback is also once()-ified, so it can safely be assigned | |
// to multiple events etc. First call wins. | |
setTimeout(function() { | |
callback(null, key) | |
}, 100) | |
} | |
// only assigns a single setTimeout | |
// when it dings, all cbs get called | |
req('foo', cb1) | |
req('foo', cb2) | |
req('foo', cb3) | |
req('foo', cb4) | |
``` |