How to use the react-static.pathJoin function in react-static

const template = nodePath.resolve(page)
          // Make sure the path is relative to the location root
          let path = nodePath.relative(location, template)
          // Cutoff the extension
          path = nodePath.join(
            nodePath.dirname(path),
            nodePath.basename(path, nodePath.extname(path))
          )
          // Ensure paths are unix
          path = path.split(nodePath.sep).join(nodePath.posix.sep)
          // Make sure it starts with a slash
          path = path[0] === '/' ? path : `/${path}`
          // Turn `/index` paths into roots`
          path = path.replace(/\/index$/, '/')
          // Add the path prefix
          path = pathPrefix ? pathJoin(pathPrefix, path) : path
          // Return the route
          return createRoute({
            path,
            template,
            originalPath,
          })
        })
      )

export function getPermaLink(path, prefixPath) {
  const permalink = `${prefixPath}${pathJoin(path)}`
  return `${permalink}/`.replace(REGEX_TO_GET_LAST_SLASH, '/')
}