helene/utils/iterator.js

Real-time Web Apps for Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createIterator = createIterator;
function createIterator(emitter, event) {
    let done = false;
    return {
        [Symbol.asyncIterator]() {
            return this;
        },
        next() {
            return new Promise(resolve => {
                if (done) {
                    resolve({ done: true });
                    return;
                }
                emitter.once(event, (value) => {
                    resolve({ value, done: false });
                });
            });
        },
        return() {
            done = true;
            return { done: true };
        },
        throw(error) {
            done = true;
            return Promise.reject(error);
        },
    };
}
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