feat: allow markdownItSetup to be async

src/index.ts

@@ -16,11 +16,11 @@ function VitePluginMarkdown(userOptions: Options = {}): Plugin {
   return {
     name: 'vite-plugin-vue-markdown',
     enforce: 'pre',
-    transform(raw, id) {
+    async transform(raw, id) {
       if (!filter(id))
         return
       try {
-        return markdownToVue(id, raw)
+        return (await markdownToVue)(id, raw)
       }
       catch (e: any) {
         this.error(e)
@@ -32,7 +32,7 @@ function VitePluginMarkdown(userOptions: Options = {}): Plugin {
 
       const defaultRead = ctx.read
       ctx.read = async function () {
-        return markdownToVue(ctx.file, await defaultRead()).code
+        return (await markdownToVue)(ctx.file, await defaultRead()).code
       }
     },
   }

src/markdown.ts

@@ -61,7 +61,7 @@ function extractCustomBlock(html: string, options: ResolvedOptions) {
   return { html, blocks }
 }
 
-export function createMarkdown(options: ResolvedOptions) {
+export async function createMarkdown(options: ResolvedOptions) {
   const isVue2 = options.vueVersion.startsWith('2.')
 
   const markdown = new MarkdownIt({
@@ -91,7 +91,7 @@ export function createMarkdown(options: ResolvedOptions) {
     markdown.use(plugin, options)
   })
 
-  options.markdownItSetup(markdown)
+  await options.markdownItSetup(markdown)
 
   return (id: string, raw: string): TransformResult => {
     const {

src/types.ts

@@ -165,7 +165,7 @@ export interface Options {
    * A function providing the Markdown It instance gets the ability to apply custom
    * settings/plugins
    */
-  markdownItSetup?: (MarkdownIt: MarkdownIt) => void
+  markdownItSetup?: (MarkdownIt: MarkdownIt) => void | Promise<void>
 
   /**
    * Class names for wrapper div

test/excerpt.test.ts

@@ -3,7 +3,7 @@ import { createMarkdown } from '../src/markdown'
 import { resolveOptions } from '../src/options'
 
 describe('excerpt', () => {
-  it('rendered excerpt', () => {
+  it('rendered excerpt', async () => {
     const options = resolveOptions({
       excerpt: true,
       frontmatterOptions: {
@@ -13,7 +13,7 @@ describe('excerpt', () => {
         },
       },
     })
-    const markdownToVue = createMarkdown(options)
+    const markdownToVue = await createMarkdown(options)
     const md = `---
 title: Hey
 ---
@@ -30,7 +30,7 @@ This is an excerpt which has been rendered to **HTML**.
     expect(markdownToVue('', md).code).toMatchSnapshot()
   })
 
-  it('raw excerpt', () => {
+  it('raw excerpt', async () => {
     const options = resolveOptions({
       excerpt: true,
       frontmatterOptions: {
@@ -41,7 +41,7 @@ This is an excerpt which has been rendered to **HTML**.
         },
       },
     })
-    const markdownToVue = createMarkdown(options)
+    const markdownToVue = await createMarkdown(options)
     const md = `---
 title: Hey
 ---

test/frontmatterPreprocessor.test.ts

@@ -27,7 +27,7 @@ const frontmatterPreprocess: ResolvedOptions['frontmatterPreprocess'] = (fm) =>
 
 describe('provide bespoke frontmatter processor', () => {
   it('inline markdown is used over default properties', async () => {
-    const parser = createMarkdown(resolveOptions({ frontmatterPreprocess }))
+    const parser = await createMarkdown(resolveOptions({ frontmatterPreprocess }))
     const md = parser('', await readFile('test/fixtures/simple.md', 'utf-8')).code
     // Positive tests
     expect(

test/transform.test.ts

@@ -2,9 +2,9 @@ import { describe, expect, it } from 'vitest'
 import { createMarkdown } from '../src/markdown'
 import { resolveOptions } from '../src/options'
 
-describe('transform', () => {
+describe('transform', async () => {
   const options = resolveOptions({})
-  const markdownToVue = createMarkdown(options)
+  const markdownToVue = await createMarkdown(options)
 
   it('basic', () => {
     const md = `---