refactor: remove @volar/pug-language-service to optionalDependencies

close #1092

Author: johnsoncodehk

packages/vue-typescript/package.json

@@ -17,12 +17,14 @@
 	},
 	"dependencies": {
 		"@volar/code-gen": "0.34.2",
-		"@volar/pug-language-service": "0.34.2",
 		"@volar/source-map": "0.34.2",
 		"@volar/vue-code-gen": "0.34.2",
 		"@vue/compiler-sfc": "^3.2.31",
 		"@vue/reactivity": "^3.2.31"
 	},
+	"optionalDependencies": {
+		"@volar/pug-language-service": "0.34.2"
+	},
 	"browser": {
 		"./out/plugins/pug.js": "./out/plugins/empty.js"
 	}

packages/vue-typescript/src/plugins/pug.ts

@@ -1,4 +1,3 @@
-import * as pug from '@volar/pug-language-service';
 import { VueLanguagePlugin } from '../typescriptRuntime';
 
 export default function (): VueLanguagePlugin {
@@ -9,7 +8,13 @@ export default function (): VueLanguagePlugin {
 
 			if (lang === 'pug') {
 
-				const pugDoc = pug.baseParse(template);
+				let pug: typeof import('@volar/pug-language-service') | undefined;
+
+				try {
+					pug = require('@volar/pug-language-service');
+				} catch { }
+
+				const pugDoc = pug?.baseParse(template);
 
 				if (pugDoc) {
 					return {