It's always bugged me how difficult translations in applications ends up being, so this is an attempt on making that task as simple as possible. It's based on some really nice projects e.g. node-polyglot.

The only thing I would have like to do better, is the flexibility of extraction - currently you are required to use import Trans from 'wilster-trans' syntax - due to my poor regex skills.. nevertheless, it works :)

npm i --save wilster-trans and for CLI command npm i -g wilster-trans

1. Import the repo (import Trans from 'wilster-trans')
2. Run the Trans.init({config: {...}, locales: {...}) (see example)
3. Start using it (Trans.t("foo")'). NB: Trans is the mandatory name for the extractor to work.
4. Run wilster-trans run -s PATH_TO_SRC -o PATH_TO_OUTPUT_DIR -l COMMA_SEPARATED_LOCALES. This will extract all the translation keys and put them into your translation directory.

NB: If you want to run the extractor from the local scope, just call ./node_modules/wilster-trans/bin/wilster-trans.js run instead.

./src/application.js

import React, { Component } from 'react'
import Trans from 'wilster-trans'

// Init's the translator
Trans.init({
  config: {
    defaultLocale: "en"
  },
  locales: {
    en: require("path/to/translations/en.json"),
    da: require("path/to/translations/da.json")
  }
})

export default App extends Component {
  render() {
    return (
	    <div>
        <h1>{Trans.t("welcome.heading")}</h1>
	      <p>{Trans.t("welcome.greetings", {name: "John Doe"})}</p>
	    </div>
    )
  }
}

Then run wilster-trans run -s ./src -o ./src/translations -l en,da

./src/translations/en.json

{
  "welcome.heading": "Hello world",
  "welcome.greetings": "Hi there %name% - nice to see you!"
}

wilster-trans run -s PATH_TO_SRC -o PATH_TO_OUTPUT_DIR -l COMMA_SEPARATED_LOCALES Runs the extractor.

-o || --output is the output directory.

-s || --source is the code source directory (where we'll look for "Trans.t" matches)

-l || --locales is the locales that will be created.

• Trans.t(translationKey: String, params: Object) If you want to use placeholders, you should use the following syntax Hi there %name%! in the translation string, and reference it using in the params object e.g. Trans.t("...", {name: "John Doe"})

• Trans.setLocale('LOCALE_KEY') Run this method if you want to change from the current language. Then re-render your UI and it'll use the newly set locale.