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metamask-extension/app/scripts/lib/createStreamSink.js
Whymarrh Whitby 92971d3c87
Migrate codebase to use ESM (#7730)
* Update eslint-plugin-import version

* Convert JS files to use ESM

* Update ESLint rules to check imports

* Fix test:unit:global command env

* Cleanup mock-dev script
2020-01-09 00:04:58 -03:30

24 lines
620 B
JavaScript

import { Writable as WritableStream } from 'readable-stream'
import promiseToCallback from 'promise-to-callback'
class AsyncWritableStream extends WritableStream {
constructor (asyncWriteFn, _opts) {
const opts = Object.assign({ objectMode: true }, _opts)
super(opts)
this._asyncWriteFn = asyncWriteFn
}
// write from incomming stream to state
_write (chunk, encoding, callback) {
promiseToCallback(this._asyncWriteFn(chunk, encoding))(callback)
}
}
function createStreamSink (asyncWriteFn, _opts) {
return new AsyncWritableStream(asyncWriteFn, _opts)
}
export default createStreamSink