blitzkit/packages/scripts/src/pruneStrings.ts

import {
  DEFAULT_LOCALE,
  SUPPORTED_LOCALES,
  TranslationTree,
} from '@blitzkit/i18n';
import { writeFile } from 'fs/promises';

const ROOT = '@blitzkit/i18n/strings';
const WORKING_ROOT = '../../packages/i18n/strings';

const defaultStrings = await import(`${ROOT}/${DEFAULT_LOCALE}.json`);
const nonDefaultLocales = SUPPORTED_LOCALES.filter(
  (locale) => locale !== DEFAULT_LOCALE,
);

function prune(defaultStrings: TranslationTree, strings: TranslationTree) {
  for (const key in strings) {
    if (key in defaultStrings) {
      if (typeof defaultStrings[key] === typeof strings[key]) {
        if (typeof strings[key] === 'string') {
          if (
            // are equivalent regardless of %s flavor
            (defaultStrings[key] as string).replaceAll(/%s\d/g, '%s') ===
              (strings[key] as string).replaceAll(/%s\d/g, '%s') ||
            // string is empty
            strings[key] === '' ||
            // string has old flavor of %s
            strings[key].match(/%s([^\d]|$)/g) !== null
          ) {
            delete strings[key];
          }
        } else {
          prune(defaultStrings[key] as TranslationTree, strings[key]);
        }
      } else {
        delete strings[key];
      }
    } else {
      delete strings[key];
    }
  }

  return strings;
}

for (const locale of nonDefaultLocales) {
  console.log(`Pruning ${locale}...`);

  const strings = await import(`${ROOT}/${locale}.json`);
  const pruned = prune(defaultStrings, strings);

  writeFile(`${WORKING_ROOT}/${locale}.json`, JSON.stringify(pruned, null, 2));
}