shelving/sequence/ThroughSequence.js

Toolkit for using data in JavaScript.

import { awaitDispose, isAsyncDisposable } from "../util/dispose.js";
import { Sequence } from "./Sequence.js";
/**
 * Async iterable that pulls values from a source async iterable.
 * - Can be used to turn an `AsyncIterator` into an `AsyncIterableIterator`
 * - Can be used to ensure `throw()` and `return()` are always set on an `AsyncIterator`
 */
export class ThroughSequence extends Sequence {
    source;
    constructor(source) {
        super();
        this.source = source;
    }
    next(value) {
        return this.source.next(value);
    }
    async return(value) {
        return this.source.return ? this.source.return(value) : super.return(value);
    }
    throw(reason) {
        return this.source.throw ? this.source.throw(reason) : super.throw(reason);
    }
    async [Symbol.asyncDispose]() {
        await awaitDispose(isAsyncDisposable(this.source) ? this.source : undefined, // Stop the source.
        super[Symbol.asyncDispose]());
    }
}