Introduction


This is an i18next backend to be used in Node.js and Deno. It will load resources from the file system.

It's based on the deprecated i18next-node-fs-backend and can mostly be used as a drop-in replacement.

It will load resources from filesystem. Right now it supports following filetypes:

- .json
- .json5
- .jsonc
- .yml/.yaml
- .js (very limited, checks for exports or export default)

Getting started

``bash


npm package


$ npm install i18next-fs-backend
`

Wiring up:

`js
import i18next from 'i18next';
import Backend from 'i18next-fs-backend';

i18next.use(Backend).init(i18nextOptions);
`

for Deno:

`js
import i18next from 'https://deno.land/x/i18next/index.js'
import Backend from 'https://deno.land/x/i18next_fs_backend/index.js'

i18next.use(Backend).init(i18nextOptions);
`

- As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.

Backend Options

`js
{
// path where resources get loaded from, or a function
// returning a path:
// function(lngs, namespaces) { return customPath; }
// the returned path will interpolate lng, ns if provided like giving a static path
loadPath: '/locales/{{lng}}/{{ns}}.json',

// path to post missing resources
addPath: '/locales/{{lng}}/{{ns}}.missing.json',

// if you use i18next-fs-backend as caching layer in combination with i18next-chained-backend, you can optionally set an expiration time
// an example on how to use it as cache layer can be found here: https://github.com/i18next/i18next-fs-backend/blob/master/example/caching/app.js
// expirationTime: 60 60 1000
}
`

Options can be passed in:

preferred - by setting options.backend in i18next.init:

`js
import i18next from 'i18next';
import Backend from 'i18next-fs-backend';

i18next.use(Backend).init({
backend: options,
});
`

on construction:

`js
import Backend from 'i18next-fs-backend';
const Backend = new Backend(null, options);
`

via calling init:

`js
import Backend from 'i18next-fs-backend';
const Backend = new Backend();
Backend.init(null, options);
`

TypeScript

To properly type the backend options, you can import the FsBackendOptions interface and use it as a generic type parameter to the i18next's init method, e.g.:

`ts
import i18n from 'i18next'
import FsBackend, { FsBackendOptions } from 'i18next-fs-backend'

i18n
.use(FsBackend)
.init({
backend: {
// fs backend options
},

// other i18next options
})
`

If set i18next initAsync option to false it will load the files synchronously

`js
// i18n.js
const { join } = require('path')
const { readdirSync, lstatSync } = require('fs')
const i18next = require('i18next')
const Backend = require('i18next-fs-backend')
i18next
.use(Backend)
.init({
// debug: true,
initAsync: false,
fallbackLng: 'en',
lng: 'en',
preload: readdirSync(join(__dirname, '../locales')).filter((fileName) => {
const joinedPath = join(join(__dirname, '../locales'), fileName)
const isDirectory = lstatSync(joinedPath).isDirectory()
return isDirectory
}),
ns: 'backend-app',
defaultNS: 'backend-app',
backend: {
loadPath: join(__dirname, '../locales/{{lng}}/{{ns}}.json')
}
})
``

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