React children to flat array

reactChildrenToFlatArray.js

import { Children } from 'react';

const getChildrenType = node => {
  if (node === null) return 'null';
  if (Array.isArray(node)) return 'array';
  if (typeof node === 'object') return 'object';
  return 'string';
}

const getElemType = elem => {
  if (typeof elem === 'string') return 'string';
  if (elem.props.children === undefined) return 'void';
  return 'normal';
}

const reactChildrenToFlatArray = children => {
  const result = Children.toArray(children).map(child => {
    switch (getElemType(child)) { // Check node type
      case 'void':  // e.g. <br /> <img />
      case 'string': // normal text
        return child;  
      case 'normal': // any other html tag or component
        switch (getChildrenType(child.props.children)) { // Check node content
          case 'null': // e.g. <Elem>null</Elem>
          case 'string': // e.g <Elem>foo</Elem>
          case 'object': // e.g. <Elem><Foo /></Elem>
            return child;
          case 'array': // multiple children
            reactChildrenToFlatArray(child.props.children);
            break;
          default: return child;
        } break;
      default: return child;
    }
    return child;
  })
  return result;
}

export default reactChildrenToFlatArray;