Notion's block type

Notion.ts

// https://www.notion.so/blog/data-model-behind-notion

enum BlockType {
  Heading,
  Callout,
  Toggle,
  Text, 
  Image, 
  OrderedList,
  TodoList,
  TodoItem,
  Page,
  Database,
  DatabaseRow
}

type Block = {
  id: string;
  type: BlockType;
  // How can properties and content be type checked depending on `type`?
  properties: object;
  content: string[];
  parent: string;
}