MobX i18n

Responsive Translation utility based on TypeScript & MobX

Features

• [x] Type hinting of Text keys
• [x] Lambda Expression values
• [x] Space utility for CJK & other characters
• [x] Responsive re-rendering
• [x] Async loading of Language packages
• [x] support HTTP protocol for Server-side rendering
• [x] support BOM/DOM language API for Client-side rendering
• [x] Speech Synthesis API for Text-to-Speech (TTS)

Versions

| SemVer | branch | status | ES decorator | MobX | | :-------: | :------: | :----------: | :----------: | :---------: | | >=0.5.0 | main | ✅developing | stage-3 | >=6.11 | | <0.5.0 | master | ❌deprecated | stage-2 | >=4 <6.11 |

Text internationalization (React/Next.js example)

Original from https://github.com/kaiyuanshe/kaiyuanshe.github.io

Installation

npm i mobx mobx-react mobx-i18n next-ssr-middleware

Configuration

tsconfig.json

{
    "compilerOptions": {
        "target": "ES6",
        "useDefineForClassFields": true,
        "experimentalDecorators": false
    }
}

Translation

translation/zh-CN.ts

import { textJoin } from 'mobx-i18n';

export default {
    open_source: '开源',
    project: '项目',
    love: ({ a, b }: Record<'a' | 'b', string>) => textJoin(a, '爱', b)
} as const;

translation/en-US.ts

import { textJoin } from 'mobx-i18n';

export default {
    open_source: 'Open Source',
    project: 'project',
    love: ({ a, b }: Record<'a' | 'b', string>) => textJoin(a, 'love', b)
} as const;

Initialization

model/Translation.ts

export const i18n = new TranslationModel({
    'zh-CN': zhCN,
    'en-US': () => import('../translation/en-US')
});

export const LanguageName: Record<(typeof i18n)['currentLanguage'], string> = {
    'zh-CN': '简体中文',
    'en-US': 'English'
};

pages/index.tsx

import { textJoin } from 'mobx-i18n';
import { compose, translator } from 'next-ssr-middleware';
import { Component } from 'react';

import { i18n, LanguageName } from '../model/Translation';

export const getServerSideProps = compose(translator(i18n));

@observer
export default class HomePage extends Component {
    render() {
        const { currentLanguage, t } = i18n;

        return (
            <>
                <select
                    value={currentLanguage}
                    onChange={({ currentTarget: { value } }) =>
                        i18n.changeLanguage(value as typeof currentLanguage)
                    }
                >
                    {Object.entries(LanguageName).map(([code, name]) => (
                        <option key={code} value={code}>
                            {name}
                        </option>
                    ))}
                </select>
                <p>
                    {t('love', {
                        a: '我',
                        b: textJoin(t('open_source'), t('project'))
                    })}
                </p>
            </>
        );
    }
}

Text to Speech (WebCell example)

pages/article.tsx

import { component, observer } from 'web-cell';
import { SpeechSynthesisModel, SpeechSynthesisState } from 'mobx-i18n';

@component({ tagName: 'article-page' })
@observer
export class ArticlePage extends HTMLElement {
    storeTTS = new SpeechSynthesisModel();

    toggleSpeaking = () => {
        const { storeTTS } = this;

        if (storeTTS.state !== SpeechSynthesisState.Clear)
            return storeTTS.toggle();

        const text = SpeechSynthesisModel.getReadableText(
            this.querySelector('article')
        );
        storeTTS.speak(text);
    };

    render() {
        const speaking = this.storeTTS.state === SpeechSynthesisState.Speaking;

        return (
            <>
                <button
                    style={{ background: speaking ? 'red' : 'blue' }}
                    onClick={this.toggleSpeaking}
                >
                    {speaking ? '🔇' : '📢'}
                </button>
                <article>
                    <h1>The Four Freedoms</h1>
                    <ol>
                        <li>Freedom of speech and expression</li>
                        <li>Freedom of worship</li>
                        <li>Freedom from want</li>
                        <li>Freedom from fear</li>
                    </ol>
                </article>
            </>
        );
    }
}

Inspired by

1. https://github.com/infinum/react-mobx-translatable
2. https://github.com/jverhoelen/react-mobx-i18n
3. https://github.com/QuiiBz/next-international