ix/asynciterable/tonodestream.mjs

The Interactive Extensions for JavaScript

import { __awaiter } from "tslib";
import { AsyncIterableX } from './asynciterablex.mjs';
import { Readable } from 'stream';
const done = (_) => __awaiter(void 0, void 0, void 0, function* () { return null; });
/** @ignore */
/** @ignore */
export class AsyncIterableReadable extends Readable {
    constructor(source, options) {
        super(options);
        this._pulling = false;
        this._objectMode = true;
        this._iterator = source[Symbol.asyncIterator]();
        this._objectMode = !options || !!options.objectMode;
    }
    _read(size) {
        const it = this._iterator;
        if (it && !this._pulling && (this._pulling = true)) {
            Promise.resolve(this._pull(it, size)).then((p) => (this._pulling = p));
        }
    }
    _destroy(err, cb) {
        const it = this._iterator;
        this._iterator = undefined;
        const fn = (it && (err ? it.throw : it.return)) || done;
        fn.call(it, err).then(() => cb && cb(null));
    }
    // eslint-disable-next-line complexity
    _pull(it, size) {
        return __awaiter(this, void 0, void 0, function* () {
            let innerSize = size;
            const objectMode = this._objectMode;
            let r;
            while (this.readable && !(r = yield it.next(innerSize)).done) {
                if (innerSize != null) {
                    if (objectMode) {
                        innerSize -= 1;
                    }
                    else {
                        innerSize -= Buffer.byteLength(r.value || '');
                    }
                }
                if (!this.push(r.value) || innerSize <= 0) {
                    break;
                }
            }
            if ((r && r.done) || !this.readable) {
                this.push(null);
                if (it.return) {
                    yield it.return();
                }
            }
            return !this.readable;
        });
    }
}
export function toNodeStream(source, options) {
    return !options || options.objectMode === true
        ? new AsyncIterableReadable(source, options)
        : new AsyncIterableReadable(source, options);
}
export function toNodeStreamProto(options) {
    return !options || options.objectMode === true
        ? new AsyncIterableReadable(this, options)
        : new AsyncIterableReadable(this, options);
}
AsyncIterableX.prototype.toNodeStream = toNodeStreamProto;

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