diff --git a/um_wasm_loader/package.json b/um_wasm_loader/package.json
index c607569..f180579 100644
--- a/um_wasm_loader/package.json
+++ b/um_wasm_loader/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unlock-music/crypto",
-  "version": "0.0.0-alpha.14",
+  "version": "0.0.0-alpha.15",
   "description": "Project Unlock Music: 加解密支持库",
   "scripts": {
     "build": "node build.js",
diff --git a/um_wasm_loader/src/loader.d.ts b/um_wasm_loader/src/loader.d.ts
index d529846..b888ef4 100644
--- a/um_wasm_loader/src/loader.d.ts
+++ b/um_wasm_loader/src/loader.d.ts
@@ -1,2 +1,9 @@
 export * from '../pkg/um_wasm';
+
+/**
+ * Get package version.
+ * @returns {string}
+ */
+export function getUmcVersion(): string;
+
 export const ready: Promise<void>;
diff --git a/um_wasm_loader/src/loader.mjs b/um_wasm_loader/src/loader.mjs
index 9697cf6..38ab160 100644
--- a/um_wasm_loader/src/loader.mjs
+++ b/um_wasm_loader/src/loader.mjs
@@ -21,10 +21,6 @@ function loader() {
   }
 }
 
-/**
- * Get package version.
- * @returns {string}
- */
 export function getUmcVersion() {
   return process.env.UMC_VERSION;
 }