Javascript function to replace an object's symbol keys with equivalent string keys

SymbolKeysToStringTask.js

// Typescript version: https://gist.github.com/eliasfeijo/672c83ff971653b551e168b156bb3baf

// Symbol used to make "_perform" method pseudo-private
const _perform = Symbol('_perform');

class SymbolKeysToStringTask {
  constructor() {
    this.symbolCounter = 0;
  }

  [_perform](o) {
    const isArray = o.constructor === Array;
    const newObject = isArray ? o : {};
    Reflect.ownKeys(o).forEach(key => {
      // if (isArray === true && key is NaN) means that it is an internal property of array e.g., "length", we won't collect those
      if (isArray && isNaN(Number(key))) return;
      const value = isArray ? o[Number(key)] : o[key];
      let parsedKey = key;
      if (typeof key === 'symbol') {
        if (key.description) parsedKey = key.description;
        else {
          parsedKey = `_symbol${++this.symbolCounter}`;
        }
      }
      if (value !== null && typeof value === 'object') {
        newObject[parsedKey] = this[_perform](value);
        return;
      }
      newObject[parsedKey] = value;
    });
    return newObject;
  }

  static run(o) {
    const task = new SymbolKeysToStringTask();
    return task[_perform](o);
  }
}

// Usage:

const myObject = {
  // Accepts numeric keys
  1: 'some value',
  // Accepts string keys
  stringKey: 'another value',
  // Using Symbol.for(keyName)
  [Symbol.for('KEY_A')]: 'A',
  // Using Symbol(keyName)
  [Symbol('KEY_B')]: 'B',
  // Using Symbol()
  [Symbol()]: 1,
  [Symbol()]: 2,
  // Using Symbol() with nested objects and arrays
  [Symbol()]: {
    [Symbol()]: 'inside nested object',
    [Symbol()]: [{ [Symbol()]: 'inside nested array' }],
  },
};

const newObject = SymbolKeysToStringTask.run(myObject);

console.log(newObject);

/* Output
 * {
 *    "1": "some value",
 *    "stringKey": "another value",
 *    "KEY_A": "A",
 *    "KEY_B": "B",
 *    "_symbol1": 1,
 *    "_symbol2": 2,
 *    "_symbol3": {
 *      "_symbol4": "inside nested object",
 *      "_symbol5": [
 *        {
 *          "_symbol6": "inside nested array"
 *        }
 *      ]
 *    }
 * }
 */