From 621490a6a423f721f7341861186fa3171a8a3230 Mon Sep 17 00:00:00 2001
From: meixg <meixg@foxmail.com>
Date: Thu, 23 Dec 2021 12:30:56 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20css=20=E4=B8=8E=20less=20=E7=AD=89?=
 =?UTF-8?q?=E8=A7=84=E5=88=99=E6=B2=A1=E6=9C=89=E5=86=99=E5=9C=A8=E4=B8=80?=
 =?UTF-8?q?=E8=B5=B7=E6=97=B6=EF=BC=8C=E5=8F=AA=E4=BC=9A=E7=BB=99=20css=20?=
 =?UTF-8?q?=E8=A7=84=E5=88=99=E5=A2=9E=E5=8A=A0=20loader?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/plugin.ts | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/plugin.ts b/src/plugin.ts
index 6fecdee..7d83fad 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -176,10 +176,35 @@ function getLoaderByMatch(compiler: Compiler, matchExtension: string) {
  * @param compiler
  */
 function addStyleLoader(compiler: Compiler) {
+    const addedRules = new Set();
     const cssRule = getLoaderByMatch(compiler, 'css');
     addLoader(cssRule);
 
+    addToOptionalRule('less');
+    addToOptionalRule('stylus');
+    addToOptionalRule('styl');
+    addToOptionalRule('sass');
+    addToOptionalRule('scss');
+
+    function addToOptionalRule(rule: string) {
+        let optRule;
+        try {
+            optRule = getLoaderByMatch(compiler, rule);
+        }
+        catch {
+        }
+        if (optRule) {
+            addLoader(optRule);
+        }
+    }
+
     function addLoader(rule: RuleSetRule) {
+        // 防止多次添加
+        if (addedRules.has(rule)) {
+            return;
+        }
+        addedRules.add(rule);
+
         if (rule.oneOf) {
             rule.oneOf.forEach(item => addLoader(item));
             return;