Introduction
This is a i18next cache layer to be used in the browser. It will load and cache resources from localStorage and can be used in combination with the chained backend.
Getting started
Source can be loaded via npmor downloaded from this repo.
- If you don't use a module loader it will be added to window.i18nextLocalStorageBackend
# npm package
$ npm install i18next-localstorage-backend
Wiring up with the chained backend:
import i18next from 'i18next';
import Backend from 'i18next-chained-backend';
import LocalStorageBackend from 'i18next-localstorage-backend'; // primary use cache
import HttpApi from 'i18next-http-backend'; // fallback http load
i18next
.use(Backend)
.init({
backend: {
backends: [
LocalStorageBackend, // primary
HttpApi // fallback
],
backendOptions: [{
/* below options */
}, {
loadPath: '/locales/{{lng}}/{{ns}}.json' // xhr load path for my own fallback
}]
}
});
Cache Backend Options
{
// prefix for stored languages
prefix: 'i18next_res_',
// expiration
expirationTime: 7*24*60*60*1000,
// Version applied to all languages, can be overriden using the option `versions`
defaultVersion: '',
// language versions
versions: {},
// can be either window.localStorage or window.sessionStorage. Default: window.localStorage
store: window.localStorage
};
-
Contrary to cookies behavior, the cache will respect updates to
expirationTime
. If you set 7 days and later update to 10 days, the cache will persist for 10 days -
Passing in a
versions
object (ex.:versions: { en: 'v1.2', fr: 'v1.1' }
) will give you control over the cache based on translations version. This setting works alongexpirationTime
, so a cached translation will still expire even though the version did not change. You can still setexpirationTime
far into the future to avoid this -
Passing in a
defaultVersion
string (ex.:version: 'v1.2'
) will act as if you applied a version to all languages usingversions
option.
IMPORTANT ADVICE for the usage in combination with saveMissing/updateMissing
We suggest not to use a caching layer in combination with saveMissing or updateMissing, because it may happen, that the trigger for this is based on stale data.
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