function codeownersMapping(data) {
    return data
        .toString()
        .split('\n')
        .filter(x => x && !x.startsWith('#'))
        .map(x => x.split("#")[0])
        .map(x => {
            const line = x.trim();
            const [path, ...owners] = line.split(/\s+/);
            return {path, owners};
        });
}

function resolveCodeowners(mapping, file) {
    let match = mapping
        .slice()