@apollo/client/testing/core/subscribeAndCount.js

A fully-featured caching GraphQL client.

import { asyncMap } from "../../utilities/index.js";
export default function subscribeAndCount(reject, observable, cb) {
    var queue = Promise.resolve();
    var handleCount = 0;
    var subscription = asyncMap(observable, function (result) {
        return queue = queue.then(function () {
            return cb(++handleCount, result);
        }).catch(error);
    }).subscribe({ error: error });
    function error(e) {
        subscription.unsubscribe();
        reject(e);
    }
    return subscription;
}
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