@zendesk/laika/esm/createLazyLoadableLink.js

Test, mock, intercept and modify Apollo Client's operations — in both browser and unit tests!

import { ApolloLink, Observable } from '@apollo/client/core';
/**
 * Creates a lazy-loadable Apollo Link.
 * Useful when you want to use a given Apollo Link in a production environment conditionally,
 * i.e. only load it when necessary.
 * @param linkPromise A Promise to an Apollo Link to wrap.
 */
export const createLazyLoadableLink = (linkPromise) => new ApolloLink((operation, forward) => {
    const linkObservable = new Observable((observer) => {
        void linkPromise.then((link) => {
            observer.next(link);
            observer.complete();
        }, (error) => {
            observer.error(error);
        });
    });
    return linkObservable.flatMap((link) => {
        const actualLinkObservable = link === null || link === void 0 ? void 0 : link.request(operation, forward);
        if (!actualLinkObservable) {
            throw new Error(`LazyLoadableLink: Incorrect linkPromise provided or it's request function returned null`);
        }
        return actualLinkObservable;
    });
});
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