pramp--Flatten-Dictionary.js

// Make new flatDict and return it
function flattenDictionary(dict) {
  const go = (dict, initialKey, flatDict) => {
    for (const key of Object.keys(dict)) {
      const value = dict[key];
      const flatKey = initialKey ? `${initialKey}.${key}` : key;

      // When the value is a primitive
      if (typeof value !== 'object') flatDict[flatKey] = value;

      // When value is a object, flatten it
      else go(value, flatKey, flatDict);
    }

    return flatDict;
  }

  return go(dict, null, {});
}