lang-tag/index.js

`lang-tag` is a robust solution for managing translations in JavaScript/TypeScript projects, especially those using component-based architectures. It simplifies i18n by allowing you to define translation keys directly within the components where they are

function transformTranslationsToFunctions(config, strategy, input, currentParentPath, currentRelativeParentPath) {
  const result = {};
  for (const [originalKey, originalValue] of Object.entries(input)) {
    const currentFullPath = `${currentParentPath}${originalKey}`;
    const currentRelativePath = currentRelativeParentPath ? `${currentRelativeParentPath}.${originalKey}` : originalKey;
    if (typeof originalValue === "object" && originalValue !== null) {
      result[originalKey] = transformTranslationsToFunctions(config, strategy, originalValue, `${currentFullPath}.`, currentRelativePath);
    } else if (typeof originalValue === "string") {
      const createTranslationFunction = (pathForFunc, unprefixedPathForFunc, keyForFunc, valueForFunc) => {
        return (params) => strategy.transform({
          config,
          parentPath: currentParentPath,
          path: pathForFunc,
          unprefixedPath: unprefixedPathForFunc,
          key: keyForFunc,
          value: valueForFunc,
          params
        });
      };
      if (strategy.processKey) {
        const keyProcessingContext = {
          config,
          parentPath: currentParentPath,
          path: currentFullPath,
          unprefixedPath: currentRelativePath,
          key: originalKey,
          value: originalValue
        };
        strategy.processKey(
          keyProcessingContext,
          (newKeyToAdd, valueForNewKey) => {
            const pathForNewKey = currentParentPath + newKeyToAdd;
            const unprefixedPathForNewKey = currentRelativeParentPath ? `${currentRelativeParentPath}.${newKeyToAdd}` : newKeyToAdd;
            result[newKeyToAdd] = createTranslationFunction(pathForNewKey, unprefixedPathForNewKey, newKeyToAdd, valueForNewKey);
          }
        );
        if (!result.hasOwnProperty(originalKey)) {
          result[originalKey] = createTranslationFunction(currentFullPath, currentRelativePath, originalKey, originalValue);
        }
      } else {
        result[originalKey] = createTranslationFunction(currentFullPath, currentRelativePath, originalKey, originalValue);
      }
    }
  }
  return result;
}
function createCallableTranslations(translations, config, strategy) {
  let basePath = config?.path || "";
  if (basePath && !basePath.endsWith(".")) basePath += ".";
  return transformTranslationsToFunctions(
    config,
    strategy,
    translations,
    basePath,
    ""
  );
}
function normalizeTranslations(translations) {
  const result = {};
  for (const key in translations) {
    if (Object.prototype.hasOwnProperty.call(translations, key)) {
      const value = translations[key];
      if (value === null || value === void 0) {
        continue;
      }
      if (typeof value === "object" && !Array.isArray(value) && !(value instanceof Function)) {
        result[key] = normalizeTranslations(value);
      } else if (typeof value === "string") {
        result[key] = (_params) => value;
      } else if (typeof value === "function") {
        result[key] = value;
      }
    }
  }
  return result;
}
function resolveTranslationFunction(translations, path) {
  let current = translations;
  for (const key of path) {
    if (current && typeof current === "object" && key in current) {
      current = current[key];
    } else {
      return null;
    }
  }
  return typeof current === "function" ? current : null;
}
function lookupTranslation(translations, dottedPath) {
  const pathSegments = dottedPath.split(".");
  return resolveTranslationFunction(translations, pathSegments);
}
function processPlaceholders(translation, params) {
  if (typeof translation !== "string") {
    return "";
  }
  return translation.replace(/{{(.*?)}}/g, (_, placeholder) => {
    const trimmedPlaceholder = placeholder.trim();
    return params?.[trimmedPlaceholder] !== void 0 ? String(params[trimmedPlaceholder]) : "";
  });
}
const defaultTranslationTransformer = ({ value, params }) => {
  return processPlaceholders(value, params);
};
export {
  createCallableTranslations,
  defaultTranslationTransformer,
  lookupTranslation,
  normalizeTranslations,
  processPlaceholders
};