diff --git a/tools/deploy/script.test.ts b/tools/deploy/script.test.ts
index bc605f3d..ba16dd85 100644
--- a/tools/deploy/script.test.ts
+++ b/tools/deploy/script.test.ts
@@ -27,3 +27,15 @@ test('run identity', () => {
     ]));
 });
 
+test('run delta', () => {
+    const aq = new script.ActionQueue();
+    const scr = new script.Script(` list(".").forEach(p => copy(p, {dir: "dest"}))`, 'expr');
+    script.run(scr, "testsrc", aq);
+    expect(aq.describe(".")).toEqual(expect.arrayContaining([
+        {src: 'testsrc/32.png', dst: "dest/32.png"},
+        {src: 'testsrc/192-g-vsmogon.png', dst: "dest/192-g-vsmogon.png"},
+    ]));
+});
+
+
+
diff --git a/tools/deploy/script.ts b/tools/deploy/script.ts
index 00276422..b97437ee 100644
--- a/tools/deploy/script.ts
+++ b/tools/deploy/script.ts
@@ -85,10 +85,15 @@ function makeEnv(srcDir : string, queue: ActionQueue) {
             return result;
         },
         
-        copy(src : pathlib.PathLike, dst : pathlib.PathLike) {
-            const srcp = pathlib.path(src);
-            const dstp = pathlib.path(dst);
-            queue.copy(pathlib.format(pathlib.join(srcDir, srcp)), pathlib.format(dstp));
+        copy(srcp : pathlib.PathLike, dstp : string | pathlib.Delta /* todo deltalike */) {
+            const src = pathlib.format(pathlib.path(srcp));
+            let dst : string;
+            if (typeof dstp === 'string') {
+                dst = dstp;
+            } else {
+                dst = pathlib.format(pathlib.path(srcp, dstp));
+            }
+            queue.copy(nodePath.join(srcDir, src), dst);
         }
     }
 }