piral-fetch/lib/create.js

Plugin for standardizing fetch in Piral.

import { httpFetch } from './fetch';
/**
 * Creates new Pilet API extensions for fetch.
 * @param config The custom fetch configuration, if any.
 */
export function createFetchApi(config = {}) {
    return (context) => {
        return {
            fetch(path, options = {}) {
                const originalHeaders = options.headers || {};
                const headerPromises = [];
                context.emit('before-fetch', {
                    headers: originalHeaders,
                    method: options.method || 'GET',
                    target: path,
                    setHeaders(headers) {
                        if (headers) {
                            headerPromises.push(headers);
                        }
                    },
                });
                return Promise.all(headerPromises)
                    .then((newHeaders) => {
                    const headers = newHeaders.reduce((obj, header) => {
                        if (typeof header === 'object' && header) {
                            return {
                                ...obj,
                                ...header,
                            };
                        }
                        return obj;
                    }, originalHeaders);
                    return {
                        ...options,
                        headers,
                    };
                })
                    .then((options) => httpFetch(config, path, options));
            },
        };
    };
}
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