piral-urql/lib/setup.js

Plugin for providing a GraphQL client in Piral.

import { Client, defaultExchanges, subscriptionExchange } from 'urql';
import { SubscriptionClient } from 'subscriptions-transport-ws';
/**
 * Sets up an urql client by using the given config.
 * @param config The configuration for the new urql client.
 */
export function setupGqlClient(config = {}) {
    const url = config.url || location.origin;
    const subscriptionUrl = (config.subscriptionUrl || url).replace(/^http/i, 'ws');
    const subscriptionClient = config.subscriptionUrl !== false &&
        new SubscriptionClient(subscriptionUrl, {
            reconnect: true,
            lazy: config.lazy || false,
            inactivityTimeout: 0,
            connectionCallback(err) {
                const { onConnected, onDisconnected } = config;
                const errors = err && (Array.isArray(err) ? err : [err]);
                if (errors && errors.length > 0) {
                    typeof onDisconnected === 'function' && onDisconnected(errors);
                }
                else {
                    typeof onConnected === 'function' && onConnected();
                }
            },
        });
    const forwardSubscription = (operation) => subscriptionClient.request(operation);
    const exchanges = [...defaultExchanges];
    if (subscriptionClient) {
        exchanges.push(subscriptionExchange({
            forwardSubscription,
        }));
    }
    return new Client({
        url,
        fetchOptions: config.default || {},
        exchanges,
    });
}
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