Function url is incorrect

Function Core.getHtmlOfUrl returns promise. So you need return this promise to a caller.

export function url(externalUrl, language = '', format = 'default', options = {
lengthLow: LENGTH_LOW_DEFAULT,
lengthHigh: LENGTH_HIGH_DEFAULT,
stopwordsLow: STOPWORDS_LOW_DEFAULT,
stopwordsHigh: STOPWORDS_HIGH_DEFAULT,
maxLinkDensity: MAX_LINK_DENSITY_DEFAULT,
maxHeadingDistance: MAX_HEADING_DISTANCE_DEFAULT,
noHeadings: NO_HEADINGS_DEFAULT,
}) {
return Core.getHtmlOfUrl(externalUrl).then((response) => {
const htmlText = response.data;
return rawHtml(htmlText, language, format, options);
}).catch((error) => {
throw error;
});
}

And justext.url(url, language, 'detailed', options).then((data)=>console.log(data));

Start at the exported url function and inspect how Core.getHtmlOfUrl and rawHtml are connected. Verify the promise returned by justext.url with the usage shown in the issue, then confirm the resolved data is passed through and errors remain observable.