misuzu/assets/misuzu.js/ext/uiharu.js

const MszUiharu = function(apiUrl) {
    const maxBatchSize = 4;
    const lookupOneUrl = apiUrl + '/metadata';

    return {
        lookupOne: async targetUrl => {
            if(typeof targetUrl !== 'string')
                throw 'targetUrl must be a string';

            return $xhr.post(lookupOneUrl, { type: 'json' }, targetUrl);
        },
    };
};