Function checkPublicFile

packages/vite/src/node/publicDir.ts:36–64

(
  url: string,
  config: ResolvedConfig,
)

}

export function checkPublicFile(
  url: string,
  config: ResolvedConfig,
): string | undefined {
  // note if the file is in /public, the resolver would have returned it
  // as-is so it's not going to be a fully resolved path.
  const { publicDir } = config
  if (!publicDir || url[0] !== '/') {
    return
  }

  const fileName = cleanUrl(url)

  // short-circuit if we have an in-memory publicFiles cache
  const publicFiles = getPublicFiles(config)
  if (publicFiles) {
    return publicFiles.has(fileName)
      ? normalizePath(path.join(publicDir, fileName))
      : undefined
  }

  const publicFile = normalizePath(path.join(publicDir, fileName))
  if (!publicFile.startsWith(withTrailingSlash(publicDir))) {
    // can happen if URL starts with '../'
    return
  }

  return tryStatSync(publicFile)?.isFile() ? publicFile : undefined
}