@appsemble/utils/serializeResource.js

Utility functions used in Appsemble internally

import { mapValues } from './mapValues.js';
/**
 * Works on a resource on the client, for example passed from the form block
 *
 * @param data The resource to be serialized, optionally containing asset blobs
 * @returns A FormData instance containing the resource and an array of the assets
 *   referenced from the resource
 */
export function serializeResource(data) {
    const assets = [];
    const extractAssets = (value) => {
        if (Array.isArray(value)) {
            return value.map(extractAssets);
        }
        if (value instanceof Blob) {
            return String(assets.push(value) - 1);
        }
        if (value instanceof Date) {
            return value.toJSON();
        }
        if (value && typeof value === 'object') {
            return mapValues(value, extractAssets);
        }
        return value;
    };
    const resource = extractAssets(data);
    if (!assets.length) {
        return resource;
    }
    const form = new FormData();
    form.set('resource', JSON.stringify(resource));
    for (const asset of assets) {
        form.append('assets', asset);
    }
    return form;
}
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