Module: core/createState
Functions
createState
▸ createState<S, A>(reducer): S
Description
It allows a class state to be defined with a reducer,
which is often used in situations where a class state is being migrated from the Redux boilerplate code to the Reactant.
And it's often used in conjunction with dispatch().
Example
const type = 'count_increase';
interface CountAction {
type: typeof type;
state: number;
}
@injectable()
class Counter {
@state
count = createState<CountAction['state'], CountAction>(
($state = 0, $action) => ($action.type === type ? $action.state : $state)
);
increase() {
dispatch<CountAction>(this, {
type,
state: this.count + 1,
});
}
}
const app = createApp({
modules: [],
main: Counter,
render: () => {},
});
app.instance.increase();
expect(app.instance.count).toBe(1);
Type parameters
| Name | Type |
|---|---|
S | any |
A | extends Action<any, A> = AnyAction |
Parameters
| Name | Type |
|---|---|
reducer | Reducer<S, A> |
Returns
S