Updating Article type definitions to match the documentation on the S…

…hopify Dev Portal. The largest change is the inclusion of a src and alt field on the image, which lets Shopify download an image on your behalf. The remaining fields of both create and update actions have been marked as optional too. The only required field listed in the documentation is the Article ID on updates.

types/index.d.ts

@@ -996,32 +996,32 @@ declare namespace Shopify {
  }
 
  interface ICreateArticle {
- author: string;
- body_html: string;
+ author?: string;
+ body_html?: string;
  handle?: string;
- image?: IBase64Image;
+ image?: ICreateArticleImage;
  metafields?: ICreateObjectMetafield[];
  published?: boolean;
  published_at?: string;
  summary_html?: string | null;
  tags?: string;
  template_suffix?: string | null;
- title: string;
+ title?: string;
  user_id?: number;
  }
 
  interface IUpdateArticle {
- author: string;
- body_html: string;
+ author?: string;
+ body_html?: string;
  handle?: string;
- image?: IBase64Image;
+ image?: ICreateArticleImage;
  metafields?: ICreateObjectMetafield[];
  published?: boolean;
  published_at?: string;
  summary_html?: string | null;
  tags?: string;
  template_suffix?: string | null;
- title: string;
+ title?: string;
  user_id?: number;
  }
 
@@ -1034,8 +1034,10 @@ declare namespace Shopify {
  alt: string | null;
  }
 
- interface IBase64Image {
- attachment: string;
+ interface ICreateArticleImage {
+ attachment?: string;
+ src?: string;
+ alt?: string;
  }
 
  interface IObjectMetafield {