@thumbmarkjs/thumbmarkjs/src/components/locales/index.ts

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import { componentInterface } from '../../factory'

export default function getLocales(): Promise<componentInterface> {
  return new Promise((resolve) => {
    resolve(
      {
        'languages': getUserLanguage(),
        'timezone': getUserTimezone()
      });
  });
}

function getUserLanguage(): string {
  return navigator.language;
}

function getUserTimezone(): string {
  return Intl.DateTimeFormat().resolvedOptions().timeZone;
}