t-i18n

T-i18n

Simple, standards-based localization. Just one T away.

Get started

Just wrap your user-facing strings in T. Don't worry about IDs.

// Import T as a singleton
import {T} from "t-i18n"

T("Hello world")

Extract the strings from your code:

extract-strings --outfile=messages.en.json ./src/**/*.ts

Translate the JSON files:

// messages.es.json
{
    "Hello-world": "Hola mundo"
}

Then load the translations, pass them to T and set the locale.

T.setup({
    locale: "es",
    messages: {
        en: englishJSON,
        es: spanishJSON
    }
})

And that's it. You're localized.

Dates, times, and numbers

Formatting is provided courtesy of the Intl API built into modern browsers.

// Get a localized, formatted date
T.date(Date.now(), "short")

// Or a number
T.number(5, "currency")

Formatters cache themselves automatically, so you don't have to.

Replacements

Basic values are easy to replace.

// "First name: Wendy"
T("First name: {userName}", { userName: "Wendy"})

Non-string values (like React components) can be interpolated using an XML syntax.

// ["There's a ", <button>button</button>, " in my sentence!"]
T.$(
    "There's a <myButton /> in my {text}!",
    {
        myButton: () => <button>button</button>,
        text: "sentence",
    }
)

If your components have string children, you can translate them inline.

// [
//     <a href={"/user/" + user.uuid}>Visit your <strong>profile</strong></a>,
//     " to change your profile picture."
// ]
T.$(
    "<link>Visit your <strong>profile</strong></link> to change your profile picture.",
    {
        link: (...children) => <a href={"/user/" + user.uuid}>{...children}</a>,
        strong: (...children) => <strong>{...children}</strong>,
    }
)

Pluralization and advanced ICU syntax

To get locale-aware pluralization, you should precompile your translations using an ICU-compliant tool. Then pass the compiled messages to T.setup instead of strings.

// Pluralization with ICU syntax
T("You have { plural, numCats, =0 {0 cats} other {# cats} }", {numCats: 4})