@lodestar/beacon-node
Version:
A Typescript implementation of the beacon chain
52 lines • 1.39 kB
JavaScript
/**
* Same as [`it-pushable`](https://github.com/alanshaw/it-pushable/blob/76a67cbe92d1db940311ee07775dbc662697e09c/index.d.ts)
* but it does not buffer values, and this.end() stops the AsyncGenerator immediately
*/
export class ItTrigger {
constructor() {
this.triggered = false;
this.ended = false;
}
trigger() {
this.triggered = true;
if (this.onNext)
this.onNext();
}
end(err) {
if (err)
this.error = err;
else
this.ended = true;
if (this.onNext)
this.onNext();
}
// AsyncGenerator API
[Symbol.asyncIterator]() {
return this;
}
async next() {
if (this.error)
throw this.error;
if (this.ended)
return { done: true, value: undefined };
if (this.triggered) {
this.triggered = false;
return { done: false, value: undefined };
}
return new Promise((resolve) => {
this.onNext = () => {
this.onNext = undefined;
resolve(this.next());
};
});
}
async return() {
this.end();
return { done: true, value: undefined };
}
async throw(err) {
this.end(err);
return { done: true, value: undefined };
}
}
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