1. export function serveStaticMiddleware(
    2.   dir: string,
    3.   config: ResolvedConfig
    4. ): Connect.NextHandleFunction {
    5.   const serve = sirv(dir, sirvOptions)
    7.   return (req, res, next) => {
    8.     const url = req.url!
    10.     // only serve the file if it's not an html request
    11.     // so that html requests can fallthrough to our html middleware for
    12.     // special processing
    13.     if (path.extname(cleanUrl(url)) === '.html') {
    14.       return next()
    15.     }
    17.     // apply aliases to static requests as well
    18.     let redirected: string | undefined
    19.     for (const { find, replacement } of config.resolve.alias) {
    20.       const matches =
    21.         typeof find === 'string' ? url.startsWith(find) : find.test(url)
    22.       if (matches) {
    23.         redirected = url.replace(find, replacement)
    24.         break
    25.       }
    26.     }
    27.     if (redirected) {
    28.       // dir is pre-normalized to posix style
    29.       if (redirected.startsWith(dir)) {
    30.         redirected = redirected.slice(dir.length)
    31.       }
    32.       req.url = redirected
    33.     }
    35.     serve(req, res, next)
    36.   }
    37. }