diff --git a/jsr.json b/jsr.json
new file mode 100644
index 0000000..2318b49
--- /dev/null
+++ b/jsr.json
@@ -0,0 +1,5 @@
+{
+  "name": "@bowencool/async-utilities",
+  "version": "2.5.5",
+  "exports": "./packages/index.ts"
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index 9ea1ce9..1c3a7e2 100644
--- a/package.json
+++ b/package.json
@@ -116,7 +116,7 @@
   "description": "async utilities",
   "author": "bowencool",
   "name": "@bowencool/async-utilities",
-  "version": "2.5.4",
+  "version": "2.5.5",
   "gitHooks": {
     "pre-commit": "lint-staged && jest --onlyChanged --coverage",
     "post-merge": "jest --changedFilesWithAncestor --coverage",
diff --git a/packages/abortableAsync/index.ts b/packages/abortableAsync/index.ts
index a7a6cb0..c271681 100644
--- a/packages/abortableAsync/index.ts
+++ b/packages/abortableAsync/index.ts
@@ -10,7 +10,10 @@ export type AbortableOption = {
   // alwaysPendingWhenTimeout?: boolean;
 };
 
-export function abortableAsync<T, P extends any[], R>(fn: (this: T, ...p: P) => Promise<R>, opt: AbortableOption = {}) {
+export function abortableAsync<T, P extends any[], R>(
+  fn: (this: T, ...p: P) => Promise<R>,
+  opt: AbortableOption = {},
+): (this: T, ...p: P) => Promise<R> {
   return function abortabledAsync(this: T, ...args: P): Promise<R> {
     return new Promise((resolve, reject) => {
       let timer: ReturnType<typeof setTimeout> | undefined;
diff --git a/packages/concurrentAsync/index.ts b/packages/concurrentAsync/index.ts
index e5bec1a..2586b7c 100644
--- a/packages/concurrentAsync/index.ts
+++ b/packages/concurrentAsync/index.ts
@@ -1,4 +1,7 @@
-export function concurrentAsync<T, P extends any[], R>(fn: (this: T, ...p: P) => Promise<R>, maxCount = 3) {
+export function concurrentAsync<T, P extends any[], R>(
+  fn: (this: T, ...p: P) => Promise<R>,
+  maxCount = 3,
+): (this: T, ...p: P) => Promise<R> {
   let that: T;
 
   type Resolve = (arg: R) => void;
diff --git a/packages/debounceAsync/index.ts b/packages/debounceAsync/index.ts
index ca1201e..5a880ab 100644
--- a/packages/debounceAsync/index.ts
+++ b/packages/debounceAsync/index.ts
@@ -1,4 +1,7 @@
-export function debounceAsync<T, P extends any[], R>(fn: (this: T, ...p: P) => Promise<R>, ms: number = 300) {
+export function debounceAsync<T, P extends any[], R>(
+  fn: (this: T, ...p: P) => Promise<R>,
+  ms: number = 300,
+): (this: T, ...p: P) => Promise<R> {
   let timeoutId: ReturnType<typeof setTimeout>;
   return function debouncedFiltered(this: T, ...args: P): Promise<R> {
     return new Promise((resolve, reject) => {
diff --git a/packages/debounceAsyncResult/index.ts b/packages/debounceAsyncResult/index.ts
index fa05aec..2121a10 100644
--- a/packages/debounceAsyncResult/index.ts
+++ b/packages/debounceAsyncResult/index.ts
@@ -1,4 +1,6 @@
-export function debounceAsyncResult<T, P extends any[], R>(fn: (this: T, ...p: P) => Promise<R>) {
+export function debounceAsyncResult<T, P extends any[], R>(
+  fn: (this: T, ...p: P) => Promise<R>,
+): (this: T, ...p: P) => Promise<R> {
   let lastFetchId = 0;
   return function asyncDebounced(this: T, ...args: P): Promise<R> {
     const fetchId = ++lastFetchId;
diff --git a/packages/throttleAsyncResult/index.ts b/packages/throttleAsyncResult/index.ts
index 5885d25..eb53f6d 100644
--- a/packages/throttleAsyncResult/index.ts
+++ b/packages/throttleAsyncResult/index.ts
@@ -1,7 +1,7 @@
 export function throttleAsyncResult<T, P extends any[], R>(
   fn: (this: T, ...p: P) => Promise<R>,
   { useSamePromise = false } = {},
-) {
+): (this: T, ...p: P) => Promise<R> {
   let isPending = false;
   let theLastPromise: null | Promise<R> = null;
   return function asyncThrottled(this: T, ...args: P): Promise<R> {
diff --git a/packages/withRetryAsync/index.ts b/packages/withRetryAsync/index.ts
index 25f97b6..7623843 100644
--- a/packages/withRetryAsync/index.ts
+++ b/packages/withRetryAsync/index.ts
@@ -14,7 +14,7 @@ export function withRetryAsync<T, P extends any[], R>(
      */
     onFailed = (i: number, lastFailedReason: unknown[]) => {},
   } = {},
-) {
+): (this: T, ...p: P) => Promise<R> {
   return function withRetryedAsync(this: T, ...args: P): Promise<R> {
     return new Promise((resolve, reject) => {
       let retriedCount = 0;
diff --git a/readme.md b/readme.md
index a8233c6..35de477 100644
--- a/readme.md
+++ b/readme.md
@@ -40,3 +40,7 @@ import { throttleAsyncResult } from '@bowencool/async-utilities';
 
 - ~~cacheAsync~~ see [memoizee](https://github.com/medikoo/memoizee#memoizing-asynchronous-functions) or [lru-pcache](https://github.com/jmendiara/lru-pcache)
 - [ ] abort fetch & xhr
+
+## License
+
+MIT
diff --git a/tsconfig.json b/tsconfig.json
index 524bf7f..542a9c8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,6 +6,7 @@
     "skipLibCheck": true,
     "noImplicitThis": true,
     "noImplicitAny": true,
+    "noImplicitReturns": true,
     "jsx": "preserve",
     "importHelpers": true,
     "moduleResolution": "node",