camelcase-keys-safe/lib/index.js

Safely convert object keys to camelCase recursively with circular reference protection, deep traversal, and robust error handling.

/* eslint-disable no-param-reassign */
'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});

var _slicedToArray = (function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i['return']) _i['return'](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError('Invalid attempt to destructure non-iterable instance'); } }; })();

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var _mapObj = require('map-obj');

var _mapObj2 = _interopRequireDefault(_mapObj);

var isObject = function isObject(v) {
  return typeof v === 'object';
};

var camelCase = function camelCase(str) {
  return str.replace(/[ _.-](\w|$)/g, function (_, x) {
    return x.toUpperCase();
  });
};

var objectValues = function objectValues(obj) {
  return Object.keys(obj).map(function (key) {
    return obj[key];
  });
};

function camelCaseRecursive(obj, cache) {
  if (!cache) {
    cache = new WeakMap();
  }

  // Handle undefined and null cases
  if (obj === undefined || obj === null) {
    return obj;
  }

  var res = undefined;
  if (isObject(obj)) {
    if (cache.has(obj)) {
      return cache.get(obj);
    }
    if (Array.isArray(obj)) {
      res = [];
    } else {
      res = {};
    }
    cache.set(obj, res);
  }

  var transform = (0, _mapObj2['default'])(obj, function (key, val) {
    var newArray = [];

    if (Array.isArray(val)) {
      val.forEach(function (value) {
        if (isObject(value) && !Array.isArray(value)) {
          newArray.push(camelCaseRecursive(value, cache));
        } else {
          newArray.push(value);
        }
      });

      return [camelCase(key), newArray];
    } else if (!val) {
      return [camelCase(key), val];
    } else if (val instanceof Date) {
      return [camelCase(key), val];
    } else if (isObject(val)) {
      return [camelCase(key), camelCaseRecursive(val, cache)];
    }

    return [camelCase(key), val];
  });

  if (obj !== null && isObject(obj)) {
    // mutate the entry in the cache so that self-references still line up
    if (Array.isArray(obj)) {
      objectValues(transform).forEach(function (entry) {
        return res.push(entry);
      });
    } else {
      Object.entries(transform).forEach(function (_ref) {
        var _ref2 = _slicedToArray(_ref, 2);

        var k = _ref2[0];
        var v = _ref2[1];
        return res[k] = v;
      });
    }

    return res;
  }

  return transform;
}

exports['default'] = camelCaseRecursive;
module.exports = exports['default'];
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