From 317a2a69051727a3df592821e447408501067dac Mon Sep 17 00:00:00 2001
From: Vlad Afonin <mytecor@ya.ru>
Date: Sun, 27 Jun 2021 22:41:15 +0300
Subject: [PATCH 1/5] Types fix + removing negation

---
 src/index.ts | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index ce26228..32bb77e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,19 +1,16 @@
 import {DependencyList, useEffect, useState} from 'react'
 
-export function useAsyncMemo<T>(factory: () => Promise<T> | undefined | null, deps: DependencyList, initial: T = undefined): T {
-  const [val, setVal] = useState<T>(initial)
+export function useAsyncMemo<T>(factory: (...args: any) => Promise<T>, deps?: DependencyList, initial?: T) {
+  let [val, setVal] = useState(initial)
+
   useEffect(() => {
-    let cancel = false
-    const promise = factory()
-    if (promise === undefined || promise === null) return
-    promise.then((val) => {
-      if (!cancel) {
-        setVal(val)
-      }
-    })
+		let pending = true
+    factory().then(res => pending && setVal(res))
+
     return () => {
-      cancel = true
+      pending = false
     }
   }, deps)
+
   return val
 }

From b9a1ccd92739973c9b3a8add3cc1980083289492 Mon Sep 17 00:00:00 2001
From: Vlad Afonin <mytecor@ya.ru>
Date: Sun, 27 Jun 2021 22:43:12 +0300
Subject: [PATCH 2/5] tabs

---
 src/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/index.ts b/src/index.ts
index 32bb77e..2cdf183 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,7 +4,7 @@ export function useAsyncMemo<T>(factory: (...args: any) => Promise<T>, deps?: De
   let [val, setVal] = useState(initial)
 
   useEffect(() => {
-		let pending = true
+    let pending = true
     factory().then(res => pending && setVal(res))
 
     return () => {

From 1734a8c39ebe49bf155d5834e08579efedf96f15 Mon Sep 17 00:00:00 2001
From: Vlad Afonin <mytecor@ya.ru>
Date: Tue, 29 Jun 2021 00:21:57 +0300
Subject: [PATCH 3/5] feat: useAsync hook for restoring current value

Minimum number of rerenders
---
 src/index.ts | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/index.ts b/src/index.ts
index 2cdf183..fae561a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-import {DependencyList, useEffect, useState} from 'react'
+import { DependencyList, useRef, useEffect, useState, useReducer, useMemo } from 'react'
 
 export function useAsyncMemo<T>(factory: (...args: any) => Promise<T>, deps?: DependencyList, initial?: T) {
   let [val, setVal] = useState(initial)
@@ -14,3 +14,24 @@ export function useAsyncMemo<T>(factory: (...args: any) => Promise<T>, deps?: De
 
   return val
 }
+
+export function useAsync<T>(factory: (...args: any) => Promise<T>, deps?: DependencyList, initial?: T) {
+  let forceUpdate = useReducer(x => !x, false)[1]
+  let val = useRef(initial)
+
+  useMemo(() => val.current = initial, deps)
+  useEffect(() => {
+    let pending = true
+    factory().then(res => {
+      if(pending) {
+        val.current = res
+        forceUpdate()
+      }
+    })
+    return () => {
+      pending = false
+    }
+  }, deps)
+
+  return val.current
+}

From 1aaf227d3f8a7a38cc11fda3ddf8e19dd2307579 Mon Sep 17 00:00:00 2001
From: Vlad Afonin <mytecor@ya.ru>
Date: Fri, 2 Jul 2021 11:17:48 +0300
Subject: [PATCH 4/5] chore: factory args

---
 src/index.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index fae561a..2273848 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,6 @@
 import { DependencyList, useRef, useEffect, useState, useReducer, useMemo } from 'react'
 
-export function useAsyncMemo<T>(factory: (...args: any) => Promise<T>, deps?: DependencyList, initial?: T) {
+export function useAsyncMemo<T>(factory: () => Promise<T>, deps?: DependencyList, initial?: T) {
   let [val, setVal] = useState(initial)
 
   useEffect(() => {
@@ -15,7 +15,7 @@ export function useAsyncMemo<T>(factory: (...args: any) => Promise<T>, deps?: De
   return val
 }
 
-export function useAsync<T>(factory: (...args: any) => Promise<T>, deps?: DependencyList, initial?: T) {
+export function useAsync<T>(factory: () => Promise<T>, deps?: DependencyList, initial?: T) {
   let forceUpdate = useReducer(x => !x, false)[1]
   let val = useRef(initial)
 

From d520683aab004f469c668bf63c846315e5f7a7d0 Mon Sep 17 00:00:00 2001
From: Vlad Afonin <mytecor@ya.ru>
Date: Thu, 8 Jul 2021 22:01:28 +0300
Subject: [PATCH 5/5] fix(useAsync): forceUpdate ignored in some cases

---
 src/index.ts | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index 2273848..418243a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -16,17 +16,15 @@ export function useAsyncMemo<T>(factory: () => Promise<T>, deps?: DependencyList
 }
 
 export function useAsync<T>(factory: () => Promise<T>, deps?: DependencyList, initial?: T) {
-  let forceUpdate = useReducer(x => !x, false)[1]
+  let forceUpdate = useState<T>()[1]
   let val = useRef(initial)
 
   useMemo(() => val.current = initial, deps)
   useEffect(() => {
     let pending = true
     factory().then(res => {
-      if(pending) {
-        val.current = res
-        forceUpdate()
-      }
+      if(pending)
+        forceUpdate(val.current = res)
     })
     return () => {
       pending = false