react-native-use-stored-state
v0.2.7
Published
State hook for react-native and react-native-web that allows easy usage of state that is persisted. It is a wrapper of async-storage which simplifies its usage for objects and loading states.
Downloads
15
Readme
react-native-use-stored-state
State hook for react-native and react-native-web that allows easy usage of state that is persisted. It is a wrapper of @react-native-async-storage/async-storage
which makes it easier to deal with objects and loading states.
Installation:
yarn add react-native-use-stored-state
Usage:
const reducer = (prevState, action) => {
switch (action.type) {
case 'age':
return {...prevState, active: action.payload.age };
}
}
const MyComponent = () => {
const [myName, setMyName, myNameIsLoaded, unsetName] = useStoredState('NAME_KEY_FOR_ASYNC_STORAGE');
const [myState, dispatch, myStateIsLoaded, unsetMyState] = useStoredReducer('MY_STATE_KEY_FOR_ASYNC_STORAGE', reducer, {
active: false,
});
if (!myNameIsLoaded || !myStateIsLoaded) {
return <Loading />;
}
const onNameChange = (name) => {
setMyName(name);
};
const onStateChange = (key, value) => {
dispatch({
type: 'abc',
payload: {
[key]: value,
}
});
};
const onClear = () => {
unsetName();
unsetMyState();
};
return (
<Container>
<Input value={myName} onChange={onNameChange} />
<Checkbox value={myState.active} onChange={(value) => onStateChange('active', value)} />
<Input value={myState.age} onChange={(value) => onStateChange('age', value)} />
<Input value={myState.year} onChange={(value) => onStateChange('year', value)} />
<Button onPress={onClear}>Clear</Button>
</Container>
);
}
this in typescript would be:
interface MyState {
active: boolean;
age?: number;
}
const ReducerAction = 'age' | 'year';
const reducer = (prevState: MyState, action: ReducerAction): MyState => {
switch (action.type) {
case 'age':
return {...prevState, active: action.payload.age };
}
}
const MyComponent = (): ReactElement => {
const [myName, setMyName, myNameIsLoaded] = useStoredState<string>('NAME_KEY_FOR_ASYNC_STORAGE');
const [myState, setMyState, myStateIsLoaded] = useStoredReducer<MyState, ReducerAction>('MY_STATE_KEY_FOR_ASYNC_STORAGE', reducer, {
active: false,
});
if (!myNameIsLoaded || !myStateIsLoaded) {
return <Loading />;
}
const onNameChange = (name: string) => {
setMyName(name);
};
const onStateChange = <K extends keyof MyState>(key: K, value: MyState[K]) => {
dispatch({
type: 'abc',
payload: {
[key]: value,
}
});
};
const onClear = () => {
unsetName();
unsetMyState();
};
return (
<Container>
<Input value={myName} onChange={onNameChange} />
<Checkbox value={myState.active} onChange={(value) => onStateChange('active', value)} />
<Input value={myState.age} onChange={(value) => onStateChange('age', value)} />
<Input value={myState.year} onChange={(value) => onStateChange('year', value)} />
<Button onPress={onClear}>Clear</Button>
</Container>
);
};