Stage 6: export book as combined Markdown or ZIP bundle (title page, book.md, chapters/, manifest) with File menu + toolbar entries and export tests

package-lock.json

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+      }
+    },
+    "node_modules/lazystream/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "license": "MIT"
+    },
+    "node_modules/lazystream/node_modules/string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
     "node_modules/linkify-it": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/linkify-it/-/linkify-it-6.1.0.tgz",
@@ -1733,6 +2128,21 @@
         "node": ">=4"
       }
     },
+    "node_modules/minimatch": {
+      "version": "10.2.6",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-10.2.6.tgz",
+      "integrity": "sha512-vpLQEs+VLCr1nU0BXS07maYoFwlDAH0gngQuuttxIwutDFEMHq2blX+8vpgxDdK3J1PwjCJiep77OitTZ4Ll1A==",
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "brace-expansion": "^5.0.8"
+      },
+      "engines": {
+        "node": "18 || 20 || >=22"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/minimist": {
       "version": "1.2.8",
       "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
@@ -1750,6 +2160,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/normalize-path": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz",
+      "integrity": "sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/normalize-url": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/normalize-url/-/normalize-url-6.1.0.tgz",
@@ -1801,6 +2220,21 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/process": {
+      "version": "0.11.10",
+      "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
+      "integrity": "sha512-cdGef/drWFoydD1JsMzuFf8100nZl+GT+yacc2bEced5f9Rjk4z+WtFUTBu9PhOi9j/jfmBPu0mMEY4wIdAF8A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6.0"
+      }
+    },
+    "node_modules/process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==",
+      "license": "MIT"
+    },
     "node_modules/progress": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
@@ -1854,6 +2288,37 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/readable-stream": {
+      "version": "4.7.0",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-4.7.0.tgz",
+      "integrity": "sha512-oIGGmcpTLwPga8Bn6/Z75SVaH1z5dUut2ibSyAMVhmUggWpmDn2dapB0n7f8nwaSiRtepAsfJyfXIO5DCVAODg==",
+      "license": "MIT",
+      "dependencies": {
+        "abort-controller": "^3.0.0",
+        "buffer": "^6.0.3",
+        "events": "^3.3.0",
+        "process": "^0.11.10",
+        "string_decoder": "^1.3.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      }
+    },
+    "node_modules/readdir-glob": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/readdir-glob/-/readdir-glob-3.0.0.tgz",
+      "integrity": "sha512-AhNB2KgKeVJr16nK9LLZbJNWnYoT23ZrumNKFDebHBdkC8KHSqWo871JAUhoWC/RtjEVdqNMFpM6qrwRbaUqpw==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "minimatch": "^10.2.2"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/yqnn"
+      }
+    },
     "node_modules/require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -1913,6 +2378,26 @@
         "tslib": "^2.1.0"
       }
     },
+    "node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/semver": {
       "version": "6.3.1",
       "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
@@ -1969,6 +2454,26 @@
       "license": "BSD-3-Clause",
       "optional": true
     },
+    "node_modules/streamx": {
+      "version": "2.28.0",
+      "resolved": "https://registry.npmjs.org/streamx/-/streamx-2.28.0.tgz",
+      "integrity": "sha512-1Yowhzjf0ivGMrTIkY9hav5TxobO9qIVqUE41fiCGMGgc3CLlf4MY+9AHmZqBWgDTue0fY9zWjYFVyf6Diuobw==",
+      "license": "MIT",
+      "dependencies": {
+        "events-universal": "^1.0.0",
+        "fast-fifo": "^1.3.2",
+        "text-decoder": "^1.1.0"
+      }
+    },
+    "node_modules/string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
     "node_modules/string-width": {
       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
@@ -2026,6 +2531,36 @@
         "url": "https://github.com/chalk/supports-color?sponsor=1"
       }
     },
+    "node_modules/tar-stream": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-3.2.0.tgz",
+      "integrity": "sha512-ojzvCvVaNp6aOTFmG7jaRD0meowIAuPc3cMMhSgKiVWws1GyHbGd/xvnyuRKcKlMpt3qvxx6r0hreCNITP9hIg==",
+      "license": "MIT",
+      "dependencies": {
+        "b4a": "^1.6.4",
+        "bare-fs": "^4.5.5",
+        "fast-fifo": "^1.2.0",
+        "streamx": "^2.15.0"
+      }
+    },
+    "node_modules/teex": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/teex/-/teex-1.0.1.tgz",
+      "integrity": "sha512-eYE6iEI62Ni1H8oIa7KlDU6uQBtqr4Eajni3wX7rpfXD8ysFx8z0+dri+KWEPWpBsxXfxu58x/0jvTVT1ekOSg==",
+      "license": "MIT",
+      "dependencies": {
+        "streamx": "^2.12.5"
+      }
+    },
+    "node_modules/text-decoder": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/text-decoder/-/text-decoder-1.2.7.tgz",
+      "integrity": "sha512-vlLytXkeP4xvEq2otHeJfSQIRyWxo/oZGEbXrtEEF9Hnmrdly59sUbzZ/QgyWuLYHctCHxFF4tRQZNQ9k60ExQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "b4a": "^1.6.4"
+      }
+    },
     "node_modules/tree-kill": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/tree-kill/-/tree-kill-1.2.2.tgz",
@@ -2094,6 +2629,12 @@
         "node": ">= 4.0.0"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
     "node_modules/wait-on": {
       "version": "8.0.5",
       "resolved": "https://registry.npmjs.org/wait-on/-/wait-on-8.0.5.tgz",
@@ -2188,6 +2729,20 @@
         "buffer-crc32": "~0.2.3",
         "fd-slicer": "~1.1.0"
       }
+    },
+    "node_modules/zip-stream": {
+      "version": "7.0.5",
+      "resolved": "https://registry.npmjs.org/zip-stream/-/zip-stream-7.0.5.tgz",
+      "integrity": "sha512-dSvYKdvLsAHCDqPOhIwk/q5CvuWtTB3Dgpoe0uVEFjTzIOAmsQpprX25InCvrvJsirEbu1OHyy67n/kAj1Sw/w==",
+      "license": "MIT",
+      "dependencies": {
+        "compress-commons": "^7.0.0",
+        "normalize-path": "^3.0.0",
+        "readable-stream": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
     }
   }
 }

package.json

@@ -18,6 +18,7 @@
     "test:e2e": "sh tests/run-e2e.sh"
   },
   "devDependencies": {
+    "@types/archiver": "^8.0.0",
     "@types/node": "^22.5.0",
     "concurrently": "^9.0.0",
     "electron": "^32.0.0",
@@ -26,6 +27,7 @@
     "wait-on": "^8.0.0"
   },
   "dependencies": {
+    "archiver": "^8.0.0",
     "markdown-it": "^15.0.0"
   }
 }

src/main/export.ts

@@ -0,0 +1,77 @@
+import { ZipArchive } from "archiver";
+import fs from "fs";
+import path from "path";
+import { loadBook } from "./project.js";
+import { listChaptersInOrder } from "./chapters.js";
+
+export function combineMarkdown(bookPath: string): string {
+  const meta = loadBook(bookPath);
+  const chapters = listChaptersInOrder(meta);
+  const parts: string[] = [];
+  parts.push(`# ${meta.title}`);
+  parts.push("");
+  parts.push("_A book compiled with Folio._");
+  for (const ch of chapters) {
+    let content = "";
+    try {
+      content = fs.readFileSync(path.join(bookPath, ch.file), "utf-8");
+    } catch {
+      content = "";
+    }
+    const body = content.replace(/\s+$/, "");
+    parts.push("");
+    parts.push("---");
+    parts.push("");
+    parts.push(`## ${ch.title}`);
+    parts.push("");
+    parts.push(body);
+  }
+  parts.push("");
+  return parts.join("\n");
+}
+
+export async function buildZip(bookPath: string): Promise<Buffer> {
+  const meta = loadBook(bookPath);
+  const chapters = listChaptersInOrder(meta);
+  const chunks: Buffer[] = [];
+  const archive = new ZipArchive({ zlib: { level: 9 } });
+
+  return new Promise<Buffer>((resolve, reject) => {
+    archive.on("error", reject);
+    archive.on("data", (c: Buffer) => chunks.push(c));
+    archive.on("end", () => resolve(Buffer.concat(chunks)));
+
+    archive.append(`# ${meta.title}\n\n_A book compiled with Folio._\n`, {
+      name: "title_page.md",
+    });
+
+    archive.append(combineMarkdown(bookPath), { name: "book.md" });
+
+    for (const ch of chapters) {
+      let content = "";
+      try {
+        content = fs.readFileSync(path.join(bookPath, ch.file), "utf-8");
+      } catch {
+        content = "";
+      }
+      const entryName = path.posix.join("chapters", path.basename(ch.file));
+      archive.append(content, { name: entryName });
+    }
+
+    const manifest = {
+      title: meta.title,
+      app: meta.app,
+      version: meta.version,
+      generatedAt: new Date().toISOString(),
+      chapterCount: chapters.length,
+      chapters: chapters.map((c) => ({
+        id: c.id,
+        title: c.title,
+        file: path.basename(c.file),
+      })),
+    };
+    archive.append(JSON.stringify(manifest, null, 2), { name: "manifest.json" });
+
+    void archive.finalize();
+  });
+}

src/main/index.ts

@@ -1,5 +1,5 @@
 import { app, BrowserWindow, dialog, ipcMain, shell } from "electron";
-import type { OpenDialogOptions } from "electron";
+import type { OpenDialogOptions, SaveDialogOptions } from "electron";
 import fs from "fs";
 import path from "path";
 import {
@@ -22,6 +22,7 @@ import {
   listChaptersInOrder,
   setChapterContent,
 } from "./chapters.js";
+import { combineMarkdown, buildZip } from "./export.js";
 
 let mainWindow: BrowserWindow | null = null;
 let bookPath: string | null = null;
@@ -35,6 +36,11 @@ function showOpenDialog(options: OpenDialogOptions) {
   return win ? dialog.showOpenDialog(win, options) : dialog.showOpenDialog(options);
 }
 
+function showSaveDialog(options: SaveDialogOptions) {
+  const win = getWindow();
+  return win ? dialog.showSaveDialog(win, options) : dialog.showSaveDialog(options);
+}
+
 function getState() {
   return { bookPath };
 }
@@ -251,6 +257,39 @@ ipcMain.handle("folio:getChapterList", () => {
   }
 });
 
+function currentBookTitle(): string {
+  try {
+    return loadBook(requireBook()).title;
+  } catch {
+    return "book";
+  }
+}
+
+ipcMain.handle("folio:exportMarkdown", async () => {
+  const bp = requireBook();
+  const { canceled, filePath } = await showSaveDialog({
+    title: "Export combined Markdown",
+    defaultPath: `${currentBookTitle()}.md`,
+    filters: [{ name: "Markdown", extensions: ["md"] }],
+  });
+  if (canceled || !filePath) return { canceled: true } as const;
+  fs.writeFileSync(filePath, combineMarkdown(bp), "utf-8");
+  return { ok: true, filePath };
+});
+
+ipcMain.handle("folio:exportZip", async () => {
+  const bp = requireBook();
+  const { canceled, filePath } = await showSaveDialog({
+    title: "Export book bundle (ZIP)",
+    defaultPath: `${currentBookTitle()}.zip`,
+    filters: [{ name: "ZIP Archive", extensions: ["zip"] }],
+  });
+  if (canceled || !filePath) return { canceled: true } as const;
+  const buf = await buildZip(bp);
+  fs.writeFileSync(filePath, buf);
+  return { ok: true, filePath };
+});
+
 ipcMain.handle("folio:saveChapter", (_e, id: string, content: string) => {
   try {
     setChapterContent(requireBook(), id, content);

src/main/menu.ts

@@ -42,6 +42,18 @@ export function buildMenu(
         },
       },
       { type: "separator" },
+      {
+        label: "Export Markdown…",
+        accelerator: "CmdOrCtrl+Shift+E",
+        enabled: !!getState().bookPath,
+        click: () => getWindow()?.webContents.send("folio:export-markdown-requested"),
+      },
+      {
+        label: "Export Bundle (ZIP)…",
+        enabled: !!getState().bookPath,
+        click: () => getWindow()?.webContents.send("folio:export-zip-requested"),
+      },
+      { type: "separator" },
       {
         label: "Close",
         accelerator: isMac ? "Cmd+W" : "Ctrl+W",

src/main/preload.ts

@@ -25,6 +25,8 @@ contextBridge.exposeInMainWorld("folio", {
     ipcRenderer.invoke("folio:reorderChapters", newOrder),
   saveChapter: (id: string, content: string) =>
     ipcRenderer.invoke("folio:saveChapter", id, content),
+  exportMarkdown: () => ipcRenderer.invoke("folio:exportMarkdown"),
+  exportZip: () => ipcRenderer.invoke("folio:exportZip"),
 
   // events
   onBookOpened: (cb: (data: { path: string; title: string }) => void) =>
@@ -41,4 +43,8 @@ contextBridge.exposeInMainWorld("folio", {
     ipcRenderer.on("folio:open-recent", (_e, p) => cb(p)),
   onRevealRequested: (cb: (p: string) => void) =>
     ipcRenderer.on("folio:reveal-requested", (_e, p) => cb(p)),
+  onExportMarkdownRequested: (cb: () => void) =>
+    ipcRenderer.on("folio:export-markdown-requested", () => cb()),
+  onExportZipRequested: (cb: () => void) =>
+    ipcRenderer.on("folio:export-zip-requested", () => cb()),
 });

src/renderer/book.ts

@@ -17,6 +17,8 @@ export type FolioAPI = {
   duplicateChapter: (id: string, title?: string) => Promise<any>;
   reorderChapters: (newOrder: string[]) => Promise<any>;
   saveChapter: (id: string, content: string) => Promise<any>;
+  exportMarkdown: () => Promise<any>;
+  exportZip: () => Promise<any>;
   onBookOpened: (cb: (data: { path: string; title: string }) => void) => void;
   onBookClosed: (cb: () => void) => void;
   onChaptersChanged: (cb: () => void) => void;
@@ -24,6 +26,8 @@ export type FolioAPI = {
   onOpenBookRequested: (cb: () => void) => void;
   onOpenRecent: (cb: (p: string) => void) => void;
   onRevealRequested: (cb: (p: string) => void) => void;
+  onExportMarkdownRequested: (cb: () => void) => void;
+  onExportZipRequested: (cb: () => void) => void;
 };
 
 const $ = (id: string) => document.getElementById(id) as HTMLElement;
@@ -68,6 +72,8 @@ export function initBook(api: FolioAPI) {
   const findPrevBtn = $("findPrev") as HTMLButtonElement;
   const findNextBtn = $("findNext") as HTMLButtonElement;
   const findCloseBtn = $("findClose") as HTMLButtonElement;
+  const exportBtn = $("exportBtn") as HTMLButtonElement;
+  const exportZipBtn = $("exportZipBtn") as HTMLButtonElement;
   const addChapterBtn = $("addChapterBtn") as HTMLButtonElement;
   const projectBar = $("projectBar");
 
@@ -282,6 +288,35 @@ export function initBook(api: FolioAPI) {
     sourceArea.focus();
   }
 
+  function status(text: string, ms = 3000) {
+    saveStateEl.textContent = text;
+    saveStateEl.classList.add("unsaved");
+    setTimeout(() => {
+      saveStateEl.textContent = dirty ? "Unsaved" : "Saved";
+      saveStateEl.classList.toggle("unsaved", dirty);
+    }, ms);
+  }
+
+  async function exportMarkdown() {
+    if (!currentBook) return;
+    const res = await api.exportMarkdown();
+    if (res && "error" in res) alert((res as { error: string }).error);
+    else if (res && "filePath" in res) status(`Exported to ${basename(res.filePath)}`);
+    else if (res && "canceled" in res) status("Export canceled");
+  }
+
+  async function exportZip() {
+    if (!currentBook) return;
+    const res = await api.exportZip();
+    if (res && "error" in res) alert((res as { error: string }).error);
+    else if (res && "filePath" in res) status(`Bundle saved to ${basename(res.filePath)}`);
+    else if (res && "canceled" in res) status("Export canceled");
+  }
+
+  function basename(p: string): string {
+    return p.split(/[/\\]/).pop() || p;
+  }
+
   function countWords(text: string) {
     const trimmed = text.trim();
     if (!trimmed) return 0;
@@ -479,6 +514,8 @@ export function initBook(api: FolioAPI) {
   $("welcomeOpenBook").addEventListener("click", () => void startOpenBook());
   newChapterBtn.addEventListener("click", () => void create());
   addChapterBtn.addEventListener("click", () => void create());
+  exportBtn.addEventListener("click", () => void exportMarkdown());
+  exportZipBtn.addEventListener("click", () => void exportZip());
   $("revealBtn").addEventListener("click", () => {
     if (currentBook) void api.revealInFolder(currentBook.path);
   });
@@ -519,6 +556,8 @@ export function initBook(api: FolioAPI) {
   api.onOpenBookRequested(() => void startOpenBook());
   api.onOpenRecent((p) => void openPath(p));
   api.onRevealRequested((p) => void api.revealInFolder(p));
+  api.onExportMarkdownRequested(() => void exportMarkdown());
+  api.onExportZipRequested(() => void exportZip());
 
   void renderRecents();
 }

src/renderer/index.html

@@ -44,6 +44,8 @@
             <div class="editor-actions">
               <span class="save-state" id="saveState">Saved</span>
               <span class="word-count" id="wordCount">words: 0</span>
+              <button class="icon-button" id="exportBtn" title="Export book (Markdown)">⬇</button>
+              <button class="icon-button" id="exportZipBtn" title="Export bundle (ZIP)">📦</button>
               <button class="icon-button" id="findBtn" title="Find (Ctrl+F)">⌕</button>
             </div>
           </header>

tests/run-chapters-test.mjs

@@ -119,6 +119,41 @@ ok(JSON.stringify(moveInOrder(["a", "b", "c", "d"], 0, 2)) === JSON.stringify(["
 ok(JSON.stringify(moveInOrder(["a", "b", "c", "d"], 3, 0)) === JSON.stringify(["d", "a", "b", "c"]), "move last to top");
 ok(JSON.stringify(moveInOrder(["a", "b", "c", "d"], 1, 1)) === JSON.stringify(["a", "b", "c", "d"]), "no-op on same index");
 
+// ---- export (combineMarkdown + buildZip) ----
+const exportOut = path.join(os.tmpdir(), `folio-export-${process.pid}.cjs`);
+await esbuild.build({
+  entryPoints: [path.resolve("src/main/export.ts")],
+  bundle: true,
+  platform: "node",
+  format: "cjs",
+  outfile: exportOut,
+  write: true,
+  logLevel: "silent",
+});
+const exportMod = (await import(url.pathToFileURL(exportOut).href)).default;
+const { combineMarkdown, buildZip } = exportMod;
+
+const b1 = createChapter(dir, "Intro");
+setChapterContent(dir, b1.id, "# Intro\n\nHello world\n\n- a\n- b");
+const b2 = createChapter(dir, "Scene");
+setChapterContent(dir, b2.id, "## Scene one\n\nIt was a night.");
+const combined = combineMarkdown(dir);
+ok(combined.includes("# Test Book"), "combined markdown starts with book title");
+ok(combined.includes("## Intro"), "combined markdown has chapter heading (Intro)");
+ok(combined.includes("## Scene"), "combined markdown has chapter heading (Scene)");
+ok(combined.includes("- a") && combined.includes("It was a night"), "combined markdown includes chapter content in order");
+ok(combined.startsWith("# Test Book"), "combined markdown first line is book title");
+
+const zip = await buildZip(dir);
+ok(Buffer.isBuffer(zip), "buildZip returns a Buffer");
+ok(zip.length > 0, "zip buffer is non-empty");
+ok(zip.includes("book.md"), "zip contains book.md");
+ok(zip.includes("title_page.md"), "zip contains title_page.md");
+ok(zip.includes("manifest.json"), "zip contains manifest.json");
+ok(zip.includes("chapters"), "zip contains a chapters/ folder");
+ok(zip.slice(0, 2).toString("ascii") === "PK", "zip starts with PK signature");
+fs.rmSync(exportOut, { force: true });
+
 fs.rmSync(projOut, { force: true });
 fs.rmSync(chapOut, { force: true });
 fs.rmSync(dir, { recursive: true, force: true });