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# minipass-flush
A Minipass stream that calls a flush function before emitting 'end'
## USAGE
```js
const Flush = require('minipass-flush')
cons f = new Flush({
flush (cb) {
// call the cb when done, or return a promise
// the 'end' event will wait for it, along with
// close, finish, and prefinish.
// call the cb with an error, or return a rejecting
// promise to emit 'error' instead of doing the 'end'
return rerouteAllEncryptions().then(() => clearAllChannels())
},
// all other minipass options accepted as well
})
someDataSource.pipe(f).on('end', () => {
// proper flushing has been accomplished
})
// Or as a subclass implementing a 'flush' method:
class MyFlush extends Flush {
flush (cb) {
// old fashioned callback style!
rerouteAllEncryptions(er => {
if (er)
return cb(er)
clearAllChannels(er => {
if (er)
cb(er)
cb()
})
})
}
}
```
That's about it.
If your `flush` method doesn't have to do anything asynchronous, then it's
better to call the callback right away in this tick, rather than returning
`Promise.resolve()`, so that the `end` event can happen as soon as
possible.
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