热重载在编译前先检查语法错误，若存在语法错误，输出后直接返回

template/scripts/watchServer.js

@@ -88,6 +88,7 @@ const restart = async () => {
         await shutdown();
     }
     // 清空lib以下目录的缓存
+    // 删除所有模块的缓存
     Object.keys(require.cache).forEach(function (key) {
         if (key.includes('lib')) {
             delete require.cache[key];
@@ -162,6 +163,7 @@ watcher.on('error', (error) => console.log(`Watcher error: ${error}`));
 let isProcessing = false;
 const onChangeDebounced = _.debounce(async (path, type) => {
     if (isProcessing) {
+        console.log('Processing, please wait...');
         return;
     }
     isProcessing = true;
@@ -175,6 +177,28 @@ const onChangeDebounced = _.debounce(async (path, type) => {
             projectReferences,
         });
         const sourceFile = program.getSourceFile(path);
+        // 是否有语法错误
+        const diagnostics = ts.getPreEmitDiagnostics(program, sourceFile);
+        if (diagnostics.length) {
+            const syntaxErrors = diagnostics.filter(
+                (diagnostic) => diagnostic.category === ts.DiagnosticCategory.Error
+            );
+        
+            if (syntaxErrors.length) {
+                console.error(`Error in ${path}`);
+                syntaxErrors.forEach((diagnostic) => {
+                    console.error(
+                        `${ts.flattenDiagnosticMessageText(
+                            diagnostic.messageText,
+                            '\n'
+                        )}`
+                    );
+                });
+                console.error(`文件存在语法错误，请检查修复后重试！`);
+                isProcessing = false;
+                return;
+            }
+        }
         // 只输出单个文件
         const emitResult = program.emit(sourceFile);
         // 是否成功