astro/dist/i18n/fallback.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

import { getPathByLocale } from "./index.js";
function computeFallbackRoute(options) {
  const { pathname, responseStatus, fallback, fallbackType, locales, defaultLocale, strategy } = options;
  if (responseStatus !== 404) {
    return { type: "none" };
  }
  if (!fallback || Object.keys(fallback).length === 0) {
    return { type: "none" };
  }
  const segments = pathname.split("/");
  const urlLocale = segments.find((segment) => {
    for (const locale of locales) {
      if (typeof locale === "string") {
        if (locale === segment) {
          return true;
        }
      } else if (locale.path === segment) {
        return true;
      }
    }
    return false;
  });
  if (!urlLocale) {
    return { type: "none" };
  }
  const fallbackKeys = Object.keys(fallback);
  if (!fallbackKeys.includes(urlLocale)) {
    return { type: "none" };
  }
  const fallbackLocale = fallback[urlLocale];
  const pathFallbackLocale = getPathByLocale(fallbackLocale, locales);
  const localeIndex = segments.indexOf(urlLocale);
  let newPathname;
  if (pathFallbackLocale === defaultLocale && strategy === "pathname-prefix-other-locales") {
    segments.splice(localeIndex, 1);
    newPathname = segments.join("/") || "/";
  } else {
    segments[localeIndex] = pathFallbackLocale;
    newPathname = segments.join("/");
  }
  return {
    type: fallbackType,
    pathname: newPathname
  };
}
export {
  computeFallbackRoute
};