i18next.js

var Backend = require('i18next-node-fs-backend');
//var Backend = require('i18next-sync-fs-backend');
var i18next = require('i18next');

var assert = require('power-assert');

var config = {
  debug: true,
  lng: 'en',
  resources: {
    en: {
      translation: {
        "key": "hello world",
        "a.b.c": "Resolvable"
      }
    },
    ja: {
      translation: {
        "key": "こんにちは",
        "onlyJa": "日本語だけ",
        "a.b.c": "解決可能"
      }
    }
  },
  nsSeparator: ':',
  keySeparator: '.',
  fallbackLng: "dev"
}
console.log(i18next);

console.log("---------------------------------------");

i18next.init(config);

console.log(i18next);

assert.equal(i18next.t('key'), "hello world");
assert.equal(i18next.t('not_found'), "not_found");
assert.equal(i18next.t('Key is not found.'), "Key is not found.");
assert.equal(i18next.t('onlyJa'), 'onlyJa');
assert.equal(i18next.t('a.b.c'), 'a.b.c');

console.log("---------------------------------------");

i18next.init(Object.assign({}, config, {
  nsSeparator: false,
  keySeparator: false
}));

console.log(i18next);

assert.equal(i18next.t('key'), "hello world");
assert.equal(i18next.t('not_found'), "not_found");
assert.equal(i18next.t('Key is not found.'), "Key is not found.");
assert.equal(i18next.t('onlyJa'), 'onlyJa');
assert.equal(i18next.t('a.b.c'), 'Resolvable');

console.log("---------------------------------------");

i18next.init(Object.assign({}, config, {
  fallbackLng: "ja",
}));

console.log(i18next);

assert.equal(i18next.t('key'), "hello world");
assert.equal(i18next.t('not_found'), "not_found");
assert.equal(i18next.t('Key is not found.'), "Key is not found.");
assert.equal(i18next.t('onlyJa'), '日本語だけ');
assert.equal(i18next.t('a.b.c'), 'a.b.c');

console.log("---------------------------------------");

i18next.init(Object.assign({}, config, {
  resources: {
    en: {
      translation: {
        "key": "hello world",
        "a.b.c": "Resolvable",
        "array": ["aaa", "bbb", 111, 222],
        "using_array_params": "hello world {{0}} {{1}} {{2}}",
        "using_object_params": "hello world {{a}} {{b}} {{c}}",
        "using_other_message": '>>$t(key)<<',
        "using_other_message_with_params": "==$t(using_object_params, {\"a\": \"hoge\", \"b\": {{b+2}}, \"c\": \"CCC\")==",
      }
    },
    ja: {
      translation: {
        "key": "こんにちは",
        "onlyJa": "日本語だけ",
        "a.b.c": "解決可能"
      }
    }
  },
  joinArrays: "\n" // これを定義すると配列をjoinした文字列を返してくれる。複数行のメッセージに良いかも
}));

console.log(i18next);

assert.equal(i18next.t('key'), "hello world");
assert.equal(i18next.t('not_found'), "not_found");
assert.equal(i18next.t('Key is not found.'), "Key is not found.");
assert.equal(i18next.t('onlyJa'), 'onlyJa');
assert.equal(i18next.t('a.b.c'), 'a.b.c');
assert.equal(i18next.t('array'), "aaa\nbbb\n111\n222");
assert.equal(i18next.t('using_array_params', ['and', 'good-bye', 'world']), 'hello world and good-bye world');
assert.equal(i18next.t('using_object_params', {a: 'and', b: 'good-bye', c: 'world'}), 'hello world and good-bye world');
assert.equal(i18next.t('using_object_params', {a: 'and', c: 'world'}), 'hello world and  world');
assert.equal(i18next.t('using_other_message'), ">>hello world<<");
assert.equal(i18next.t('using_other_message_with_params', {a: "AAA", b: "BBB"}), "==hello world AAA BBB =="); // 複雑なことはしない方が良さそう

return

console.log("---------------------------------------");

// electronに組み込むとロードできるのに、なぜかここではbackendがスルーされてる
i18next
  .use(Backend)
  .init(Object.assign({}, config, {
    resources: {},
    fallbackLng: "ja",
    backend: {
      loadPath: "/____src/locales/{{lng}}/{{ns}}.json"
    }
  }), function(err, t) {
      console.log("Initialized i18n", err, t);
      console.log(i18next.t('key'));
      console.log(i18next.t('keyEscaped'));
  });
console.log('i18next is initialized????');
console.log(i18next.t("key"))

// TODO なぜロードエラーにならない!!!!!!
return;

console.log("---------------------------------------");

i18next.use(Backend).init(Object.assign({}, config, {
    //debug: (process.env.NODE_ENV === 'development'),
    resources: {},
    debug: true,
    lng: "en",
    fallbackLng: "en",
    backend: {
        loadPath: __dirname + "/locales/{{lng}}/{{ns}}.json"
    }
}), (err) => {
    console.log('i18next is initialized:', err);
    console.log(i18next.t("key"));
    assert.equal(i18next.t("key"), "hello world");
});
console.log('i18next is initialized????');
console.log(i18next.t("key"))
assert.equal(i18next.t("key"), "hello world");

console.log("------------------------------------------");