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# y18n
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[](https://conventionalcommits.org)
The bare-bones internationalization library used by yargs.
Inspired by [i18n](https://www.npmjs.com/package/i18n).
## Examples
_simple string translation:_
```js
var __ = require('y18n').__
console.log(__('my awesome string %s', 'foo'))
```
output:
`my awesome string foo`
_using tagged template literals_
```js
var __ = require('y18n').__
var str = 'foo'
console.log(__`my awesome string ${str}`)
```
output:
`my awesome string foo`
_pluralization support:_
```js
var __n = require('y18n').__n
console.log(__n('one fish %s', '%d fishes %s', 2, 'foo'))
```
output:
`2 fishes foo`
## JSON Language Files
The JSON language files should be stored in a `./locales` folder.
File names correspond to locales, e.g., `en.json`, `pirate.json`.
When strings are observed for the first time they will be
added to the JSON file corresponding to the current locale.
## Methods
### require('y18n')(config)
Create an instance of y18n with the config provided, options include:
* `directory`: the locale directory, default `./locales`.
* `updateFiles`: should newly observed strings be updated in file, default `true`.
* `locale`: what locale should be used.
* `fallbackToLanguage`: should fallback to a language-only file (e.g. `en.json`)
be allowed if a file matching the locale does not exist (e.g. `en_US.json`),
default `true`.
### y18n.\_\_(str, arg, arg, arg)
Print a localized string, `%s` will be replaced with `arg`s.
This function can also be used as a tag for a template literal. You can use it
like this: <code>__`hello ${'world'}`</code>. This will be equivalent to
`__('hello %s', 'world')`.
### y18n.\_\_n(singularString, pluralString, count, arg, arg, arg)
Print a localized string with appropriate pluralization. If `%d` is provided
in the string, the `count` will replace this placeholder.
### y18n.setLocale(str)
Set the current locale being used.
### y18n.getLocale()
What locale is currently being used?
### y18n.updateLocale(obj)
Update the current locale with the key value pairs in `obj`.
## License
ISC
[travis-url]: https://travis-ci.org/yargs/y18n
[travis-image]: https://img.shields.io/travis/yargs/y18n.svg
[coveralls-url]: https://coveralls.io/github/yargs/y18n
[coveralls-image]: https://img.shields.io/coveralls/yargs/y18n.svg
[npm-url]: https://npmjs.org/package/y18n
[npm-image]: https://img.shields.io/npm/v/y18n.svg
[standard-image]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg
[standard-url]: https://github.com/feross/standard