feat!: remove support for @vueuse/head. Use @unhead/vue instead.

Author: antfu

src/core/markdown.ts

@@ -182,9 +182,11 @@ export async function createMarkdown(options: ResolvedOptions) {
         scriptLines.push('defineExpose({ frontmatter })')
 
       if (!isVue2 && headEnabled && head) {
+        // @ts-expect-error legacy option
+        if (headEnabled === 'vueuse')
+          throw new Error('unplugin-vue-markdown no longer supports @vueuse/head. Change `headEnabled` to `true` and install `@unhead/vue` instead.')
         scriptLines.push(`const head = ${JSON.stringify(head)}`)
-        const importFrom = headEnabled === 'unhead' ? '@unhead/vue' : '@vueuse/head'
-        scriptLines.unshift(`import { useHead } from "${importFrom}"`)
+        scriptLines.unshift(`import { useHead } from "@unhead/vue"`)
         scriptLines.push('useHead(head)')
       }
 

src/core/options.ts

@@ -1,5 +1,5 @@
 import type { Options, ResolvedOptions } from '../types'
-import { getVueVersion, isUnheadVueInstalled } from './utils'
+import { getVueVersion } from './utils'
 
 export function resolveOptions(userOptions: Options): ResolvedOptions {
   const defaultOptions: ResolvedOptions = {
@@ -36,8 +36,5 @@ export function resolveOptions(userOptions: Options): ResolvedOptions {
     ...userOptions,
   }
 
-  if (options.headEnabled === true)
-    options.headEnabled = isUnheadVueInstalled() ? 'unhead' : 'vueuse'
-
   return options as ResolvedOptions
 }

src/core/utils.ts

@@ -15,13 +15,3 @@ export function getVueVersion(defaultVersion = '3.2.0') {
     return defaultVersion
   }
 }
-
-export function isUnheadVueInstalled() {
-  try {
-    _require('@unhead/vue')
-    return true
-  }
-  catch {
-    return false
-  }
-}

src/types.ts

@@ -51,12 +51,9 @@ export interface Options {
   /**
    * Enable head support, need to install @unhead/vue and register to App in main.js
    *
-   * When `true` is passed, @unhead/vue will be used if installed.
-   * If not, @vueuse/head will be used.
-   *
-   * @default false
+   * @default true
    */
-  headEnabled?: boolean | 'unhead' | 'vueuse'
+  headEnabled?: boolean
 
   /**
    * The head field in frontmatter used to be used for @unhead/vue
@@ -197,9 +194,7 @@ export interface Options {
   exclude?: FilterPattern
 }
 
-export interface ResolvedOptions extends Required<Options> {
-  headEnabled: 'unhead' | 'vueuse' | false
-}
+export interface ResolvedOptions extends Required<Options> {}
 
 export interface MarkdownEnv extends MarkdownItEnv {
   id: string