type Title = boolean;
type CodeBlock = {
  lang: string;
  filename?: string;
  indent: number;
  start: boolean;
  end: boolean;
};
type TableBlock = {
  title: string;
  cells: string[];
  indent: number;
  start: boolean;
  end: boolean;
};
type Helpfeel = {
  prefix: "?";
  entry: string;
};
type Cli = {
  prefix: "$" | "%";
  command: string;
};
type UnitBase = {
  content: string;
  whole: string;
};
type PlainText = string;
type Blank = {
  type: "blank";
  unit: UnitBase;
  children: PlainText;
};
type Video = {
  type: "video";
  unit: UnitBase;
  fileId: string | undefined;
  children: PlainText;
};
type Vimeo = {
  type: "vimeo";
  unit: UnitBase & {
    videoId: string;
  };
  children: PlainText;
};
type Decoration = {
  type : "deco";
  unit: UnitBase & {
    deco: string;
    strong: number;
    italic: boolean;
    strike: boolean;
    underline: boolean;
  };
  children: Node;
}
type Link = {
  type: "link";
  unit: UnitBase & ({
    page: string;
  } | {
    project: string;
    page: string;
  } | {
    project: string;
  });
  children: Node;
};
type Quote = {
  type: "quote";
  unit: UnitBase & {
    tag: string;
  };
  children: Node;
};
type Code = {
  type: "code";
  unit: UnitBase;
  children: PlainText;
};
type Indent = {
  type: "indent";
  unit: UnitBase & {
    tag: string;
  };
  children: Node;
};
type Audio = {
  type: "audio";
  unit: UnitBase;
  fileId: string | undefined;
  children: PlainText;
};
type AudioLink = {
  type: "audioLink";
  unit: UnitBase & {
    link: string;
    title: string;
  };
  fileId: string | undefined;
  children: PlainText;
};
type Image = ImageBase & { type: "image"; };
type StrongImage = ImageBase & { type: "strongImage"; };
type ImageBase = {
  unit: UnitBase;
  fileId: string | undefined;
  children: PlainText;
};
type Gyazo = GyazoBase & { type: "gyazo"; };
type StrongGyazo = GyazoBase & { type: "strongGyazo"; };
type GyazoBase = {
  unit: UnitBase;
  children: PlainText;
};
type ImageLink = ImageLinkBase & { type: "imageLink"; };
type StrongImageLink = ImageLinkBase & { type: "strongImageLink"; };
type ImageLinkBase = {
  unit: UnitBase & {
    image: string;
    link: string;
  };
  children: PlainText;
};
type GyazoLink = GyazoLinkBase & { type: "gyazoLink"; };
type StrongGyazoLink = GyazoLinkBase & { type: "strongGyazoLink"; };
type GyazoLinkBase = {
  unit: UnitBase & {
    gyazo: string;
    link: string;
  };
  children: PlainText;
};
type Icon = IconBase & { type: "icon" };
type StrongIcon = IconBase & { type: "strong-icon" };
type IconBase = {
  unit: UnitBase & {
    project?: string;
    page: string;
    size: number;
  };
  children: PlainText;
};
type Formula = {
  type: "deco-formula";
  unit: UnitBase & {
    formula: string;
  };
  children: PlainText; 
}
type Formula = {
  type: "strong";
  unit: UnitBase;
  children: Node; 
}
type Url = {
  type: "url";
  unit: UnitBase;
  fileId: string | undefined;
  children: PlainText;
};
type UrlLink = {
  type: "urlLink";
  unit: UnitBase & {
    link: string;
    title?: string;
  };
  fileId: string | undefined;
  children: PlainText;
};
type Youtube = {
  type: "youtube";
  unit: UnitBase & {
    params: Record<string, string> & { t?: number; };
  } & ({
    videoId?: string;
  } | {
    listId?: string;
  });
  children: PlainText;
};
type Location = {
  type: "location";
  unit: UnitBase & {
    latitude: number;
    longitude: number;
    zoom: number;
    title?: string;
  };
  children: PlainText;
};