message: Update source-map.d.ts with the latest commonmark types.
diff: @@ -352,15 +352,17 @@ declare module "commonmark" {
  // Leonard Thieu <https://github.com/leonard-thieu>
  // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
  + export type NodeType = 'text' | 'softbreak' | 'linebreak' | 'emph' | 'strong' | 'html_inline' | 'link' | 'image' | 'code' | 'document' | 'paragraph' |
  + 'block_quote' | 'item' | 'list' | 'heading' | 'code_block' | 'html_block' | 'thematic_break' | 'custom_inline' | 'custom_block';
  +
  export class Node {
  - constructor(nodeType: string, sourcepos?: Position);
  + constructor(nodeType: NodeType, sourcepos?: Position);
  /**
  * (read-only): a String, one of text, softbreak, linebreak, emph, strong, html_inline, link, image, code, document, paragraph,
  * block_quote, item, list, heading, code_block, html_block, thematic_break.
  */
  - readonly type: 'text' | 'softbreak' | 'linebreak' | 'emph' | 'strong' | 'html_inline' | 'link' | 'image' | 'code' | 'document' | 'paragraph' |
  - 'block_quote' | 'item' | 'list' | 'heading' | 'code_block' | 'html_block' | 'thematic_break' | 'custom_inline' | 'custom_block';
  + readonly type: NodeType;
  /**
  * (read-only): a Node or null.
  */
  