Xliff to Json (buildtime)

xliff-to-json.mjs

import {xliff12ToJs} from 'xliff';
import {readFileSync, writeFileSync} from 'fs';

export async function xliffToJson(translations) {
  const parserResult = await xliff12ToJs(translations, {
    captureSpacesBetweenElements: true,
  });
  const xliffContent = parserResult.resources["ng2.template"];

  return Object.keys(xliffContent).reduce((result, current) => {
    const translation = xliffContent[current].target;
    if (typeof translation === "string") {
      result[current] = translation.trim();
    } else if (Array.isArray(translation)) {
      result[current] = translation
        .map((entry) =>
          typeof entry === "string" ? entry.trim() : `{{${entry.Standalone.id}}}`,
        )
        .map((entry) => entry.replace("{{", "{$").replace("}}", "}").trim())
        .join(" ").trim();
    } else {
      throw new Error("Could not parse XLIFF: " + JSON.stringify(translation));
    }
    return result;
  }, {});
}

['da', 'fr', 'de', 'nb', 'sv'].forEach(async lang => {
  const xliffFile = `src/i18n/messages.${lang}.xlf`;
  const jsonFile = `src/i18n/messages.${lang}.json`;
  const xliff = readFileSync(xliffFile, 'utf8');  
  const js = await xliffToJson(xliff);
  writeFileSync(jsonFile, JSON.stringify(js));

});