express-intlayer/dist/esm/index.mjs

Manage internationalization i18n in a simple way for express application.

import { createModuleAugmentation } from "@intlayer/chokidar";
import { getConfiguration } from "@intlayer/config";
import {
  getTranslation,
  localeDetector
} from "@intlayer/core";
import { createNamespace } from "cls-hooked";
const { middleware, internationalization } = getConfiguration({
  verbose: true
});
const { headerName, cookieName } = middleware;
const appNamespace = createNamespace("app");
createModuleAugmentation();
const translateFunction = (_req, res, _next) => (content, locale) => {
  const { locale: currentLocale, defaultLocale } = res.locals;
  const targetLocale = locale ?? currentLocale;
  if (typeof content === "undefined") {
    return "";
  }
  if (typeof content === "string") {
    return content;
  }
  if (typeof content?.[targetLocale] === "undefined") {
    if (typeof content?.[defaultLocale] === "undefined") {
      return content;
    } else {
      return getTranslation(content, defaultLocale);
    }
  }
  return getTranslation(content, targetLocale);
};
const intlayer = () => (req, res, next) => {
  const localeCookie = req.cookies?.[cookieName];
  const localeHeader = req.headers?.[headerName];
  const negotiatorHeaders = {};
  if (req && typeof req.headers === "object") {
    for (const key in req.headers) {
      if (typeof req.headers[key] === "string") {
        negotiatorHeaders[key] = req.headers[key];
      }
    }
  }
  const localeDetected = localeDetector(
    negotiatorHeaders,
    internationalization.locales,
    internationalization.defaultLocale
  );
  res.locals.locale_header = localeHeader;
  res.locals.locale_cookie = localeCookie;
  res.locals.locale_detected = localeDetected;
  res.locals.locale = localeCookie ?? localeHeader ?? localeDetected;
  res.locals.defaultLocale = internationalization.defaultLocale;
  const t2 = translateFunction(req, res, next);
  res.locals.t = t2;
  appNamespace.run(() => {
    appNamespace.set("t", t2);
    next();
  });
};
const t = (content, locale) => appNamespace.get("t")(content, locale);
export {
  intlayer,
  t,
  translateFunction
};
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