code: function validatePage(page, path) {
    let errors = [];
  
    // Check for required properties
    errors = [...errors, ...assertProperties(page, path, requiredProperties[page.type])];
  
    if (page.children) {
      // Check that children is an array
      if (!Array.isArray(page.children)) {
        errors = [...errors, { path, error: 'Children must be an array' }];
  
        return errors;
      }
  
      page.children.forEach((node, index) => {
        errors = [...errors, ...validateNode(node, [...path, 'children', index], [page])];
      });
    }
  
    return errors;
  }
docs: Validate a page, checking that the required properties are in place