diff --git a/README.md b/README.md
index 472f2b70..eb9a0472 100644
--- a/README.md
+++ b/README.md
@@ -81,12 +81,10 @@
     <br/>
 - [**State**](./docs/State.md)
   - [`createMemo`](./docs/createMemo.md) &mdash; factory of memoized hooks.
-  - [`useAdopt`](./docs/useAdopt.md) &mdash; extract value from multiple render-prop (or FaCC) components.
   - [`useCallbag`](./docs/useCallbag.md) &mdash; tracks latest value of a callbag.
   - [`useGetSet`](./docs/useGetSet.md) &mdash; returns state getter `get()` instead of raw state.
   - [`useGetSetState`](./docs/useGetSetState.md) &mdash; as if [`useGetSet`](./docs/useGetSet.md) and [`useSetState`](./docs/useSetState.md) had a baby.
   - [`useObservable`](./docs/useObservable.md) &mdash; tracks latest value of an `Observable`.
-  - [`useRenderProp`](./docs/useRenderProp.md) &mdash; extracts value from a render-prop or a FaCC.
   - [`useSetState`](./docs/useSetState.md) &mdash; creates `setState` method which works like `this.setState`. [![][img-demo]](https://codesandbox.io/s/n75zqn1xp0)
   - [`useToggle` and `useBoolean`](./docs/useToggle.md) &mdash; tracks state of a boolean.
   - [`useCounter` and `useNumber`](./docs/useCounter.md) &mdash; tracks state of a number.
diff --git a/docs/useAdopt.md b/docs/useAdopt.md
deleted file mode 100644
index fb95095a..00000000
--- a/docs/useAdopt.md
+++ /dev/null
@@ -1,37 +0,0 @@
-> __WARNING:__ Don't use this, works only for functional components.
-
-# `useAdopt`
-
-Extracts a values from multiple render-prop or FaCC components.
-This hook is similar to [`useRenderProp`](./useRenderProp.md), but
-it allows to specify a named map of multiple render-prop elements
-from which to extract values.
-
-
-## Usage
-
-```jsx
-import {useAdopt} from 'react-use';
-
-const FaCC = ({children}) => {
-  return children('VALUE-FaCC');
-};
-const RenderProp = ({render}) => {
-  return render('VALUE-RenderProp');
-};
-
-const Demo = () => {
-  const [fragment, result] = useAdopt({
-    facc: <FaCC/>,
-    renderProp: <RenderProp/>,
-  });
-
-  return (
-    <>
-      {fragment}
-      <div>FaCC: {result.facc[0]}</div>
-      <div>Render prop: {result.renderProp[0]}</div>
-    </>
-  );
-};
-```
diff --git a/docs/useRenderProp.md b/docs/useRenderProp.md
deleted file mode 100644
index 1d943ccb..00000000
--- a/docs/useRenderProp.md
+++ /dev/null
@@ -1,33 +0,0 @@
-> __WARNING:__ Don't use this, works only for functional components.
-
-# `useRenderProp`
-
-Extracts a value from render-prop or FaCC component.
-
-
-## Usage
-
-```jsx
-import {useRenderProp} from 'react-use';
-
-const FaCC = ({children}) => {
-  return children('VALUE-FaCC');
-};
-const RenderProp = ({render}) => {
-  return render('VALUE-RenderProp');
-};
-
-const Demo = () => {
-  const [fragment1, [value1]] = useRenderProp(<FaCC />);
-  const [fragment2, [value2]] = useRenderProp(<RenderProp />);
-
-  return (
-    <>
-      {fragment1}
-      {fragment2}
-      <div>FaCC: {value1}</div>
-      <div>Render prop: {value2}</div>
-    </>
-  );
-};
-```
diff --git a/src/__stories__/useAdopt.story.tsx b/src/__stories__/useAdopt.story.tsx
deleted file mode 100644
index 629cb220..00000000
--- a/src/__stories__/useAdopt.story.tsx
+++ /dev/null
@@ -1,105 +0,0 @@
-import {storiesOf} from '@storybook/react';
-import * as React from 'react';
-import {useAdopt} from '..';
-import {useState} from 'react';
-import ShowDocs from '../util/ShowDocs';
-import {Spring} from 'react-spring';
-
-const FaCC = ({children}) => {
-  return children('VALUE-FaCC');
-};
-const RenderProp = ({render}) => {
-  return render('VALUE-RenderProp');
-};
-
-let values = [];
-let cnt = 0;
-const Spring2 = (props) => {
-  if (cnt < 100) {
-    props.children(...values);
-    cnt++;
-  }
-  return <Spring {...props}>{(...res) => {
-    values = res as any;
-    return null;
-  }}</Spring>
-};
-
-let cnt2 = 0;
-
-const Spring3 = (props) => {
-  const [state, set] = useState<any[]>([]);
-
-  return (
-    <Spring {...props}>{(...data) => {
-      setTimeout(() => {
-        set(data);
-        props.children(...data);
-      }, 1);
-      return null;
-    }}</Spring>
-  );
-};
-
-const Demo = () => {
-  const [fragment, result] = useAdopt({
-    facc: <FaCC/>,
-    renderProp: <RenderProp/>,
-  });
-
-  return (
-    <>
-      {fragment}
-      <div>FaCC: {result.facc[0]}</div>
-      <div>Render prop: {result.renderProp[0]}</div>
-    </>
-  );
-};
-
-const AnimationSpring = () => {
-  const style = {
-    width: 200,
-    height: 200,
-    borderRadius: '100px',
-    left: 50,
-    position: 'fixed',
-    background: 'red',
-  };
-
-  return (
-    <Spring3 from={{top: 0}} to={{top: 200}}>{(data) =>
-      <div style={{...style, ...data} as any} />
-    }</Spring3>
-  );
-};
-
-const Animation = () => {
-  const [fragments, res] = useAdopt({animation: <Spring3 from={{top: 0}} to={{top: 200}}/>});
-  const style = {
-    width: 200,
-    height: 200,
-    borderRadius: '100px',
-    left: 50,
-    position: 'fixed',
-    background: 'red',
-  };
-
-  return (
-    <>
-      {fragments}
-      <div style={{...style, ...res.animation[0]} as any} />
-    </>
-  );
-};
-
-storiesOf('State/useAdopt', module)
-  .add('Docs', () => <ShowDocs md={require('../../docs/useAdopt.md')} />)
-  .add('Demo', () =>
-    <Demo/>
-  )
-  .add('AnimationSpring', () =>
-    <AnimationSpring/>
-  )
-  .add('Animation', () =>
-    <Animation/>
-  )
diff --git a/src/__stories__/useAsync.story.tsx b/src/__stories__/useAsync.story.tsx
index b517ad5f..0c3fc6ae 100644
--- a/src/__stories__/useAsync.story.tsx
+++ b/src/__stories__/useAsync.story.tsx
@@ -3,14 +3,14 @@ import {storiesOf} from '@storybook/react';
 import {useAsync} from '..';
 import ShowDocs from '../util/ShowDocs';
 
-const fn = () => new Promise((resolve) => {
+const fn = () => new Promise<string>((resolve) => {
   setTimeout(() => {
     resolve('RESOLVED');
   }, 1000);
 });
 
 const Demo = () => {
-  const {loading, value} = useAsync(fn);
+  const {loading, value} = useAsync<string>(fn);
 
   return (
     <div>
diff --git a/src/__stories__/useRenderProp.story.tsx b/src/__stories__/useRenderProp.story.tsx
deleted file mode 100644
index fd566be7..00000000
--- a/src/__stories__/useRenderProp.story.tsx
+++ /dev/null
@@ -1,31 +0,0 @@
-import {storiesOf} from '@storybook/react';
-import * as React from 'react';
-import {useRenderProp} from '..';
-import ShowDocs from '../util/ShowDocs';
-
-const FaCC = ({children}) => {
-  return children('VALUE-FaCC');
-};
-const RenderProp = ({render}) => {
-  return render('VALUE-RenderProp');
-};
-
-const Demo = () => {
-  const [fragment1, [value1]] = useRenderProp(<FaCC />);
-  const [fragment2, [value2]] = useRenderProp(<RenderProp />);
-
-  return (
-    <>
-      {fragment1}
-      {fragment2}
-      <div>FaCC: {value1}</div>
-      <div>Render prop: {value2}</div>
-    </>
-  );
-};
-
-storiesOf('State/useRenderProp', module)
-  .add('Docs', () => <ShowDocs md={require('../../docs/useRenderProp.md')} />)
-  .add('Demo', () =>
-    <Demo/>
-  )
diff --git a/src/index.ts b/src/index.ts
index ae6ecc03..781f36da 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,4 @@
 import createMemo from './createMemo';
-import useAdopt from './useAdopt';
 import useAsync from './useAsync';
 import useAudio from './useAudio';
 import useBattery from './useBattery';
@@ -31,7 +30,6 @@ import useOrientation from './useOrientation';
 import useOutsideClick from './useOutsideClick';
 import useRaf from './useRaf';
 import useRefMounted from './useRefMounted';
-import useRenderProp from './useRenderProp';
 import useSessionStorage from './useSessionStorage';
 import useSetState from './useSetState';
 import useSize from './useSize';
@@ -49,7 +47,6 @@ import useWait from './useWait';
 
 export {
   createMemo,
-  useAdopt,
   useAsync,
   useAudio,
   useBattery,
@@ -81,7 +78,6 @@ export {
   useOutsideClick,
   useRaf,
   useRefMounted,
-  useRenderProp,
   useSessionStorage,
   useSetState,
   useSize,
diff --git a/src/useAdopt.ts b/src/useAdopt.ts
deleted file mode 100644
index 175c8c5c..00000000
--- a/src/useAdopt.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import * as React from 'react';
-import useRenderProp from './useRenderProp';
-
-const useAdopt = <T extends {[key: string]: any[]}>(map: {[key in keyof T]: React.ReactElement<any>}): [React.ReactElement<any>, T] => {
-  const keys = Object.keys(map);
-  const fragments: React.ReactElement<any>[] = [];
-  const result: T = {} as T;
-
-  keys.sort();
-  for (const key of keys) {
-    const [fragment, value] = useRenderProp(map[key]);
-    fragments.push(React.cloneElement(fragment, {key}));
-    result[key] = value;
-  }
-
-  return [React.createElement(React.Fragment, null, ...fragments), result];
-};
-
-export default useAdopt;
diff --git a/src/useAsync.ts b/src/useAsync.ts
index aa0ecfe1..760bceca 100644
--- a/src/useAsync.ts
+++ b/src/useAsync.ts
@@ -3,10 +3,13 @@ import {useState, useEffect, useCallback} from 'react';
 export type AsyncState<T> =
 | {
   loading: true;
+  error?: undefined;
+  value?: undefined;
 }
 | {
   loading: false;
   error: Error;
+  value?: undefined;
 }
 | {
   loading: false;
diff --git a/src/useRenderProp.ts b/src/useRenderProp.ts
deleted file mode 100644
index e16c1168..00000000
--- a/src/useRenderProp.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-import * as React from 'react';
-import createMemo from './createMemo';
-
-const {useState, useCallback} = React;
-
-const useRenderProp = (element: React.ReactElement<any>): [React.ReactElement<any>, any[]] => {
-  if (process.env.NODE_ENV !== 'production') {
-    if (!React.isValidElement(element)) {
-      throw new TypeError(
-        'useRenderProp element to be a valid React element ' +
-        'such as <MyRenderProp />.'
-      );
-    }
-  }
-
-  const [state, setState] = useState<any[]>([]);
-  const useSetState = createMemo((...args) => setState(args));
-  const render = useCallback((...args) => {
-    useSetState(...args);
-    return null;
-  }, []);
-  const cloned = React.cloneElement(element, {
-    render,
-    children: render,
-  });
-
-  return [cloned, state];
-};
-
-export default useRenderProp;
diff --git a/yarn.lock b/yarn.lock
index bdab4b18..0096ce12 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9556,10 +9556,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@^3.1.3:
-  version "3.1.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.3.tgz#01b70247a6d3c2467f70c45795ef5ea18ce191d5"
-  integrity sha512-+81MUSyX+BaSo+u2RbozuQk/UWx6hfG0a5gHu4ANEM4sU96XbuIyAB+rWBW1u70c6a5QuZfuYICn3s2UjuHUpA==
+typescript@^3.2.2:
+  version "3.2.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.2.2.tgz#fe8101c46aa123f8353523ebdcf5730c2ae493e5"
+  integrity sha512-VCj5UiSyHBjwfYacmDuc/NOk4QQixbE+Wn7MFJuS0nRuPQbof132Pw4u53dm264O8LPc2MVsc7RJNml5szurkg==
 
 ua-parser-js@^0.7.18:
   version "0.7.19"