Fluent.js is a JavaScript implementation of Project Fluent, a localization framework designed to unleash the expressive power of the natural language.

Project Fluent keeps simple things simple and makes complex things possible. The syntax used for describing translations is easy to read and understand. At the same time it allows, when necessary, to represent complex concepts from natural languages like gender, plurals, conjugations, and others.

Fluent.js consists of a set of packages which have different use-cases and can be installed independently of each other.

• fluent
• fluent-syntax
• fluent-intl-polyfill
• fluent-langneg
• fluent-react

You can install each of the above packages via npm, e.g. npm install fluent-react. See the end of this README for instructions on how to build fluent.js locally.

FTL is a localization file format used for describing translation resources. FTL stands for Fluent Translation List.

FTL is designed to be simple to read, but at the same time allows to represent complex concepts from natural languages like gender, plurals, conjugations, and others.

hello-user = Hello, { $username }!

Read the Fluent Syntax Guide in order to learn more about the syntax. If you're a tool author you may be interested in the formal EBNF grammar.

We'd love to hear your thoughts on Project Fluent! Whether you're a localizer looking for a better way to express yourself in your language, or a developer trying to make your app localizable and multilingual, or a hacker looking for a project to contribute to, please do get in touch on the mailing list and the IRC channel.

• mailing list: https://lists.mozilla.org/listinfo/tools-l10n
• IRC channel: irc://irc.mozilla.org/l20n

Fluent.js is open-source, licensed under the Apache License, Version 2.0. We encourage everyone to take a look at our code and we'll listen to your feedback.

Hacking on fluent.js is easy! To quickly get started clone the repo:

$ git clone https://github.com/projectfluent/fluent.js.git
$ cd fluent.js

You'll need node.js 8 LTS (v8.9.0 and up). Older 8.x versions and 7.x versions have been reported to work as well. node.js 6.x is not supported.

Install the build tools used by all packages (Babel, Rollup, Mocha etc.):

$ npm install

Install dependencies of individual fluent.js packages which are required for passing tests:

$ make deps

Build all packages at once:

$ make

…which is equivalent to:

$ make lint
$ make test
$ make build

You can also cd into a package's directory and issue the above make commands from there. Only this one package will be affected.