// ./src/i18n/locales/en.ts

const en = {
  button: {
    submit: 'Submit',
    cancel: 'Go back',
  },
  user: {
    profile: 'Tom',
  },
};

export default en;
export type Locale = typeof en;

// ./src/i18n/locales/zh.ts

import { Locale } from './en';

const zh: Locale = {
  button: {
    submit: '提交',
    cancel: '返回',
  },
  user: {
    profile: '原罪',
  },
};

export default zh;

// ./src/i18n/index.ts

import { createI18n } from '@i18n-chain/*';
import en from './locales/en';

const i18n = createI18n({
  defaultLocale: {
    key: 'en',
    values: en,
  },
});

export default i18n;

import { createI18n } from '@i18n-chain/*';
import zh from './locales/zh';

const i18n = createI18n({
  defaultLocale: { ... },
});

i18n._.define('zh', zh);

export default i18n;

const i18n = createI18n({
  defaultLanguage: { ... },
  loader: (name) => import('./locales/' + name),
});

export default i18n;

i18n._.locale('zh');

const en = {
  property: ['{{property1}}template{{property2}}', { property1: value2, property2: value2 }],
};

const en = {
  user: {
    profile: [
      'My name is {{name}}, I born in {{country}}, I am {{age}} old now, my birthday is {{birthday}}',
      {
        country: undefined,
        name: 'Tom',
        age: (value: number = 20) => {
          if (value <= 1) {
            return `${value} year`;
          } else {
            return `${value} years`;
          }
        },
        birthday: (value: Date) => {
          return value.toString();
        },
      },
    ],
  },
};

////////////////////////////////////
// The above code equivalent to definition below: (automatically)
interface User {
  Profile {
    country: string | number;
    name?: string;
    age?: number;
    birthday: Date;
  }
}
/////////////////////////////////////

// Minium configuration
i18n.user.profile({
  age: 20,
  country: 'China',
});

// Append optional property `name`
i18n.user.profile({
  age: 30,
  country: 'Usa',
  name: 'Lucy',
});

const en = {
  template: ['Hello, {{world}}', { world: undefined }]
};