react-async-iterators/dist/cjs/common/iterateAsyncIterWithCallbacks.js

The magic of JavaScript async iterators in React ⛓️ 🧬 🔃

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.iterateAsyncIterWithCallbacks = iterateAsyncIterWithCallbacks;
function iterateAsyncIterWithCallbacks(iterable, initialValue, changeCb) {
    const iterator = iterable[Symbol.asyncIterator]();
    let iteratorClosedByConsumer = false;
    let lastValue = initialValue;
    (async () => {
        try {
            const { done, value } = await iterator.next();
            if (iteratorClosedByConsumer) {
                return;
            }
            if (!done) {
                lastValue = value;
                changeCb({ value, done: false, error: undefined }); // Ensuring the first yield is exempt from the "different from previous value" check
                for await (const value of { [Symbol.asyncIterator]: () => iterator }) {
                    if (!iteratorClosedByConsumer && !Object.is(value, lastValue)) {
                        lastValue = value;
                        changeCb({ value, done: false, error: undefined });
                    }
                }
            }
            if (!iteratorClosedByConsumer) {
                changeCb({ value: lastValue, done: true, error: undefined });
            }
        }
        catch (err) {
            if (!iteratorClosedByConsumer) {
                changeCb({ value: lastValue, done: true, error: err });
            }
        }
    })();
    return () => {
        if (!iteratorClosedByConsumer) {
            iteratorClosedByConsumer = true;
            iterator.return?.();
        }
    };
}
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