@reactivex/ix-esnext-esm/asynciterable/operators/expand.js

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterablex';
export class ExpandAsyncIterable extends AsyncIterableX {
    constructor(source, selector) {
        super();
        this._source = source;
        this._selector = selector;
    }
    async *[Symbol.asyncIterator]() {
        const q = [this._source];
        while (q.length > 0) {
            const src = q.shift();
            for await (const item of src) {
                const items = await this._selector(item);
                q.push(items);
                yield item;
            }
        }
    }
}
export function expand(selector) {
    return function expandOperatorFunction(source) {
        return new ExpandAsyncIterable(source, selector);
    };
}

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