FBT initializing util

fbt.ts

import { init } from 'fbt';
import intl from '../../assets/translatedFbts.json';

const DEFAULT_LOCALE = 'en';

export const viewerContext = {
  locale: DEFAULT_LOCALE,
};

export const initFbt = (): void => {
  if (navigator) {
    viewerContext.locale = navigator.language.substr(0, 2);
  }

  init({
    translations: intl as FBT.Translations,
    hooks: {
      getViewerContext: (): { locale: string } => viewerContext,
    },
  });
};

export const LOCALES = Object.freeze({
  ko: Object.freeze({
    bcp47: 'ko',
    rtl: false,
  }),
  en: Object.freeze({
    bcp47: 'en',
    rtl: false,
  }),
});

export enum Locale {
  KO = 'ko',
  EN = 'en',
}

export const changeLocale = (locale: Locale): void => {
  viewerContext.locale = locale;

  const html = document.getElementsByTagName('html')[0];

  if (html != null) {
    html.lang = LOCALES[locale].bcp47;
  }

  document.body.className = LOCALES[locale].rtl ? 'rtl' : 'ltr';
};

"scripts": {
  "start": "webpack serve --config webpack.config.js",
  "tsc": "tsc",
  "test": "jest",
  "production": "NODE_ENV=production webpack -p --config webpack.config.prod.js",
  "lint": "eslint src --ext .ts,.tsx,.js,.jsx",
  "manifest": "babel-node node_modules/.bin/fbt-manifest --src src",
  "collect-fbts": "babel-node node_modules/.bin/fbt-collect --pretty --manifest < .src_manifest.json > .source_strings.json",
  "test-collect-fbts": "babel-node node_modules/.bin/fbt-collect --plugins @babel/plugin-syntax-flow --pretty --manifest < .src_manifest.json > .test_source_strings.json",
  "translate-fbts": "babel-node node_modules/.bin/fbt-translate --translations assets/translations/*.json --jenkins > assets/translatedFbts.json",
  "translate-fbts-single-file": "babel-node node_modules/.bin/fbt-translate --jenkins --stdin < translation_input.json > assets/translatedFbts.json",
  "test-translate-fbts-into-output-dir": "babel-node node_modules/.bin/fbt-translate --translations assets/translations/*.json --jenkins --output-dir assets/translatedFbts",
  "clean-fbts": "rm .enum_manifest.json .src_manifest.json .source_strings.json assets/translatedFbts.json 2&> /dev/null || exit 0",
  "fbt-all": "yarn manifest && yarn collect-fbts && yarn translate-fbts"
},