feat: make vue as optional peer dependency

docs/TROUBLESHOOTING.md

@@ -110,3 +110,7 @@ module.exports = {
     plugins: [require('@serverless-guru/prettier-plugin-import-order')],
 };
 ```
+
+#### Q. Why are my .vue sfc files not being formatted?
+
+Be sure that you have `@vue/compiler-sfc` installed in your project, (run `npm ls @vue/compiler-sfc` to double-check).  If it's not there, install it and try formatting again.

package.json

@@ -37,8 +37,7 @@
         "@babel/types": "~7.19.4",
         "javascript-natural-sort": "0.7.1",
         "lodash.clone": "~4.5.0",
-        "lodash.isequal": "~4.5.0",
-        "@vue/compiler-sfc": "3.2.40"
+        "lodash.isequal": "~4.5.0"
     },
     "devDependencies": {
         "@babel/preset-typescript": "7.18.6",
@@ -51,11 +50,18 @@
         "jest": "29.2.1",
         "prettier": "2.7.1",
         "ts-jest": "29.0.3",
-        "typescript": "4.8.4"
+        "typescript": "4.8.4",
+        "@vue/compiler-sfc": "3.2.40"
     },
     "peerDependencies": {
+        "@vue/compiler-sfc": ">=3.0.0",
         "prettier": "2.x"
     },
+    "peerDependenciesMeta": {
+        "@vue/compiler-sfc": {
+            "optional": true
+        }
+    },
     "publishConfig": {
         "access": "public"
     }

src/preprocessors/vue-preprocessor.ts

@@ -1,11 +1,20 @@
-import { parse } from '@vue/compiler-sfc';
+import type { PrettierOptions } from '../types';
 
-import { PrettierOptions } from '../types';
 import { preprocessor } from './preprocessor';
 
 export function vuePreprocessor(code: string, options: PrettierOptions) {
-    const { descriptor } = parse(code);
-    const content = (descriptor.script ?? descriptor.scriptSetup)?.content ?? code;
+    try {
+        const { parse } = require('@vue/compiler-sfc');
+        const { descriptor } = parse(code);
+        const content = (descriptor.script ?? descriptor.scriptSetup)?.content ?? code;
 
-    return code.replace(content, `\n${preprocessor(content, options)}\n`);
+        return code.replace(content, `\n${preprocessor(content, options)}\n`);
+    } catch (err) {
+        if ((err as NodeJS.ErrnoException).code === 'MODULE_NOT_FOUND') {
+            console.warn(
+                '[@serverless-guru/prettier-plugin-import-order]: Could not process .vue file.  Please be sure that "@vue/compiler-sfc" is installed in your project.',
+            );
+            throw err;
+        }
+    }
 }