Flatten a deep object into a one level object with it’s dot separated path as key

flatten.js

const flatten = object => {
  const result = {};
  const go = (curr, parents) => {
    Object.entries(curr).forEach(([key, value]) => {
      const path = [...parents, key];
      if (value !== null && typeof value === 'object') {
        go(value, path);
      } else {
        result[path.join('.')] = value;
      }
    });
  };
  go(object, []);
  return result;
};