diff --git a/.changeset/fix-scan-dest-occupancy-dry.md b/.changeset/fix-scan-dest-occupancy-dry.md
new file mode 100644
index 0000000..2753592
--- /dev/null
+++ b/.changeset/fix-scan-dest-occupancy-dry.md
@@ -0,0 +1,5 @@
+---
+"@sfmc-bds/bds-tools": patch
+---
+
+修复 #80 合入冲突残留：`scanDestOccupancy` 恢复走 `readPackDirOccupancy`（DRY），消除未声明标识符导致的 tsc7 构建失败。
diff --git a/bds-tools/src/world-packs.ts b/bds-tools/src/world-packs.ts
index 2659b4b..9201999 100644
--- a/bds-tools/src/world-packs.ts
+++ b/bds-tools/src/world-packs.ts
@@ -566,7 +566,7 @@ export type PackInstallPlan =
 
 /**
  * 读单目录占用事实（info 优先，否则 header）。
- * 解析失败返回 null；不抛 BOM（readJsonFile 已剥离）。
+ * 解析失败返回 null；BOM 已由 readJsonFile 剥离，不再抛 Utf8BomError。
  */
 export function readPackDirOccupancy(dir: string): {
   uuid: string;
@@ -590,17 +590,11 @@ export function readPackDirOccupancy(dir: string): {
   return null;
 }
 
-/** 扫描 destParent 下含 manifest 的目录占用（单一事实源：readPackDirOccupancy） */
+/** 扫描 destParent 下含 manifest 的目录占用（占用事实唯一入口：readPackDirOccupancy） */
 export function scanDestOccupancy(destParent: string): DestOccupancy[] {
   const out: DestOccupancy[] = [];
   for (const dir of listPackDirsIn(destParent)) {
-    let facts: ReturnType<typeof readPackDirOccupancy> = null;
-    try {
-      // DRY：与 readPackDirOccupancy 共用 info→header 回退，禁止内联双读
-      facts = readPackDirOccupancy(dir);
-    } catch {
-      /* manifest 不可读则占位 uuid 为空 */
-    }
+    const facts = readPackDirOccupancy(dir);
     out.push({
       folderName: path.basename(dir),
       dir,
diff --git a/bds-tools/world-packs.test.mjs b/bds-tools/world-packs.test.mjs
index 67caf3a..08e2377 100644
--- a/bds-tools/world-packs.test.mjs
+++ b/bds-tools/world-packs.test.mjs
@@ -550,6 +550,51 @@ describe("world-packs primitives", () => {
     assert.equal(readPackManifestInfo(existingB)?.name, "Slash Blade v2b");
   });
 
+  it("scanDestOccupancy 走 readPackDirOccupancy（完整 + 残缺 header）", async () => {
+    const { scanDestOccupancy, readPackDirOccupancy } = await import("./dist/world-packs.js");
+    const dest = path.join(tmp, "occupancy-dry");
+    const fullDir = path.join(dest, "[RP] Full");
+    writeManifest(fullDir, {
+      name: "Full Pack",
+      uuid: "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa",
+      version: [2, 1, 0],
+      type: "resources",
+    });
+    const partialDir = path.join(dest, "[RP] Partial");
+    fs.mkdirSync(partialDir, { recursive: true });
+    fs.writeFileSync(
+      path.join(partialDir, "manifest.json"),
+      JSON.stringify({
+        format_version: 2,
+        header: {
+          name: "Partial",
+          uuid: "bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb",
+          version: [3, 0, 0],
+        },
+        modules: [],
+      })
+    );
+
+    const fullFacts = readPackDirOccupancy(fullDir);
+    assert.equal(fullFacts?.uuid, "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa");
+    assert.deepEqual(fullFacts?.version, [2, 1, 0]);
+    assert.equal(fullFacts?.name, "Full Pack");
+    assert.equal(fullFacts?.kind, "resource");
+
+    const partialFacts = readPackDirOccupancy(partialDir);
+    assert.equal(partialFacts?.uuid, "bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb");
+    assert.deepEqual(partialFacts?.version, [3, 0, 0]);
+    assert.equal(partialFacts?.kind, undefined);
+
+    const occ = scanDestOccupancy(dest);
+    assert.equal(occ.length, 2);
+    const byUuid = new Map(occ.map((o) => [o.uuid, o]));
+    assert.equal(byUuid.get("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa")?.name, "Full Pack");
+    assert.equal(byUuid.get("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa")?.kind, "resource");
+    assert.equal(byUuid.get("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb")?.version?.[0], 3);
+    assert.equal(byUuid.get("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb")?.name, undefined);
+  });
+
   it("installPackDirectory：残缺 manifest 占用目录时换名而非覆盖", async () => {
     const { installPackDirectory, formatWorldPackFolderName } = await import("./dist/world-packs.js");
     const dest = path.join(tmp, "broken-parent");