How to convert local file path to a file::?/ url safely in node.js?

I have local file paths (in node.js) and I need to convert them into file:// urls.

I'm now looking at https://en.wikipedia.org/wiki/File_URI_scheme and I feel this must be a solved problem and somebody must have a snippet or npm module to do this.

But then I try to search npm for this but I get so much cruft it is not funny (file, url and path are a search hit in like every package ever :) Same with google and SO.

I can do this naïve approach

site = path.resolve(site);
if (path.sep === '\\') {
    site = site.split(path.sep).join('/');
}
if (!/^file:\/\//g.test(site)) {
    site = 'file:///' + site;
}

But I'm pretty sure that is not the way to go.