export function _common(paths: string[], sep: string): string { const [first = "", ...remaining] = paths; const parts = first.split(sep);
let endOfPrefix = parts.length; let append = ""; for (const path of remaining) { const compare = path.split(sep); if (compare.length <= endOfPrefix) { endOfPrefix = compare.length; append = ""; }
for (let i = 0; i < endOfPrefix; i++) { if (compare[i] !== parts[i]) { endOfPrefix = i; append = i === 0 ? "" : sep; break; } } } return parts.slice(0, endOfPrefix).join(sep) + append;}