@nuxtjs/i18n/dist/runtime/server/utils/cache.js

Internationalization for Nuxt

import { useStorage } from "nitropack/runtime";
import { prefixStorage } from "unstorage";
const storage = prefixStorage(useStorage(), "i18n");
export function cachedFunctionI18n(fn, opts) {
  opts = { maxAge: 1, ...opts };
  const pending = {};
  async function get(key, resolver) {
    const isPending = pending[key];
    if (!isPending) {
      pending[key] = Promise.resolve(resolver());
    }
    try {
      return await pending[key];
    } finally {
      delete pending[key];
    }
  }
  return async (...args) => {
    const key = [opts.name, opts.getKey(...args)].join(":").replace(/:\/$/, ":index");
    const maxAge = opts.maxAge ?? 1;
    const isCacheable = !opts.shouldBypassCache(...args) && maxAge >= 0;
    const cache = isCacheable && await storage.getItemRaw(key);
    if (!cache || cache.ttl < Date.now()) {
      pending[key] = Promise.resolve(fn(...args));
      const value = await get(key, () => fn(...args));
      if (isCacheable) {
        await storage.setItemRaw(key, { ttl: Date.now() + maxAge * 1e3, value, mtime: Date.now() });
      }
      return value;
    }
    return cache.value;
  };
}