fix: 修复预览与 PDF 渲染边界问题

packages/renderer/src/render-markdown.ts

@@ -13,6 +13,15 @@ import sanitizeHtml from "sanitize-html";
 
 export const RENDERER_VERSION = 1;
 
+export class MarkdownDocumentParseError extends Error {
+  readonly code = "INVALID_FRONT_MATTER";
+
+  constructor(message: string, options?: ErrorOptions) {
+    super(message, options);
+    this.name = "MarkdownDocumentParseError";
+  }
+}
+
 export interface MarkdownDocumentMetadata {
   title: string;
   author: string;
@@ -198,9 +207,10 @@ function parseFrontMatter(source: string) {
     return matter(source);
   } catch (error) {
     const message = error instanceof Error ? error.message : "未知错误";
-    throw new Error(`无法解析 Markdown Front Matter：${message}`, {
-      cause: error
-    });
+    throw new MarkdownDocumentParseError(
+      `无法解析 Markdown Front Matter：${message}`,
+      { cause: error }
+    );
   }
 }
 

packages/renderer/tests/render-markdown.test.ts

@@ -1,5 +1,8 @@
 import { describe, expect, it } from "vitest";
-import { renderMarkdown } from "../src/render-markdown.js";
+import {
+  MarkdownDocumentParseError,
+  renderMarkdown
+} from "../src/render-markdown.js";
 
 describe("renderMarkdown", () => {
   it("渲染常用 Markdown 扩展并识别能力", () => {
@@ -71,6 +74,17 @@ lang: zh-CN
     });
   });
 
+  it("使用稳定错误类型报告无效 Front Matter", () => {
+    expect(() =>
+      renderMarkdown(`---
+title: [未闭合
+---
+
+# 文档
+`)
+    ).toThrow(MarkdownDocumentParseError);
+  });
+
   it("服务端渲染公式并保留 Mermaid 安全占位", () => {
     const result = renderMarkdown(`
 内联公式 $E=mc^2$。