/**
  Extract the first H1 from a Markdown string

  @param mdContent - some Markdown content
  @returns page H1 `string` if it exists, otherwise `null`
  @example
  ```ts
  const mdContent = "# My Page Title";
  const pageTitle = extractMarkdownH1(mdContent);
  console.log(pageTitle); // "My Page Title"

  const noTitleMdContent = "content without a h1";
  const noTitle = extractMarkdownH1(noTitleMdContent);
  console.log(noTitle); // null
  ```
 */
export declare function extractMarkdownH1(mdContent: string): string | undefined;
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