diff --git a/apps/server/src/sandbox/archives.ts b/apps/server/src/sandbox/archives.ts
index c3763dd8..dae2cb10 100644
--- a/apps/server/src/sandbox/archives.ts
+++ b/apps/server/src/sandbox/archives.ts
@@ -1,10 +1,25 @@
 // 压缩包解压(沙箱内):zip 用 fflate,rar 用 node-unrar-js(WASM),7z 用 7z-wasm。
 // WASM 库要读自己包里的 .wasm 文件:prepareArchives() 在撤销权限前预热(载入内存),之后只在内存里解压。
-import SevenZip from "7z-wasm";
+import * as SevenZipModule from "7z-wasm";
 import { unzipSync } from "fflate";
 import { createExtractorFromData } from "node-unrar-js";
 
-type Seven = Awaited<ReturnType<typeof SevenZip>>;
+/** 用到的 7z-wasm 接口(Emscripten 实例:内存文件系统 + callMain) */
+interface Seven {
+  FS: {
+    writeFile(path: string, data: Uint8Array): void;
+    readFile(path: string): Uint8Array;
+    readdir(path: string): string[];
+    stat(path: string): { mode: number };
+    isDir(mode: number): boolean;
+  };
+  callMain(args: string[]): unknown;
+}
+// 7z-wasm 是 CJS 包:tsc 与 deno check 对默认导出的理解不同,运行时取 default 或模块本身
+const SevenZip = ((SevenZipModule as unknown as { default?: unknown }).default ?? SevenZipModule) as unknown as (opts: {
+  print: (s: string) => void;
+  printErr: (s: string) => void;
+}) => Promise<Seven>;
 let seven: Seven | null = null;
 let warmed = false;
 
@@ -54,13 +69,13 @@ export async function extractArchive(
   }
   const out: Record<string, Uint8Array> = {};
   const walk = (d: string, rel: string) => {
-    for (const n of z.FS.readdir(d) as string[]) {
+    for (const n of z.FS.readdir(d)) {
       if (n === "." || n === "..") continue;
       const p = `${d}/${n}`;
       const r = rel ? `${rel}/${n}` : n;
       if (z.FS.isDir(z.FS.stat(p).mode)) walk(p, r);
       else {
-        const data = z.FS.readFile(p) as Uint8Array;
+        const data = z.FS.readFile(p);
         if (accept(r, data.length)) out[r] = data;
       }
     }