piral-core/lib/components/Mediator.js

The core library for creating a Piral instance.

import * as React from 'react';
import { startLoadingPilets } from 'piral-base';
import { useGlobalStateContext } from '../hooks';
import { none } from '../utils';
/**
 * The Mediator component for interfacing with pilets loading.
 */
export const Mediator = ({ options }) => {
    const { initialize, readState, emit } = useGlobalStateContext();
    React.useEffect(() => {
        const shouldLoad = readState((s) => s.app.loading);
        if (shouldLoad) {
            const { connect, disconnect } = startLoadingPilets(options);
            emit('loading-pilets', { options });
            const notifier = (error, pilets, loaded) => {
                initialize(!loaded, error, pilets);
                if (loaded) {
                    emit('loaded-pilets', { pilets, error });
                }
            };
            connect(notifier);
            return () => disconnect(notifier);
        }
    }, none);
    // tslint:disable-next-line:no-null-keyword
    return null;
};
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