fix: theme resolve

Author: antfu

packages/slidev/node/options.ts

@@ -1,4 +1,4 @@
-import { resolve, dirname } from 'path'
+import { resolve, dirname, join } from 'path'
 import Vue from '@vitejs/plugin-vue'
 import ViteIcons from 'vite-plugin-icons'
 import ViteComponents from 'vite-plugin-components'
@@ -117,7 +117,7 @@ export async function resolveOptions(
   const roots = uniq([clientRoot, ...themeRoots, userRoot])
 
   if (themeRoots.length) {
-    const themeMeta = await getThemeMeta(theme, themeRoots[0])
+    const themeMeta = await getThemeMeta(theme, join(themeRoots[0], 'package.json'))
     if (themeMeta)
       data.config = parser.resolveConfig(data.headmatter, themeMeta)
   }

packages/slidev/node/themes.ts

@@ -22,8 +22,9 @@ export function packageExists(name: string) {
   return false
 }
 
-export async function getThemeMeta(name: string, path?: string) {
-  path ||= resolveImportPath(`${name}/package.json`)
+export async function getThemeMeta(name: string, path: string) {
+  if (!fs.existsSync(path))
+    return {}
 
   if (path) {
     const { slidev = {}, engines = {} } = await fs.readJSON(path)