feat: expose createMarkdownRenderer

Author: yyx990803

src/node/index.ts

@@ -2,5 +2,6 @@ export * from './server'
 export * from './build/build'
 export * from './serve/serve'
 export * from './config'
+export * from './markdown/markdown'
 
 export type { SiteData, HeadConfig, LocaleConfig } from '../../types/shared'

src/node/markdown/markdown.ts

@@ -44,6 +44,8 @@ export interface MarkdownRenderer {
   render: (src: string, env?: any) => { html: string; data: any }
 }
 
+export type { Header }
+
 export const createMarkdownRenderer = (
   srcDir: string,
   options: MarkdownOptions = {}