46 lines
1.2 KiB
TypeScript
46 lines
1.2 KiB
TypeScript
import React from "react";
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const CTXString = React.createContext("lol");
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type StateBinding<T> = [get:T, set:React.StateUpdater<T>];
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const CTXState = React.createContext(null) as React.Context<StateBinding<number>|null>;
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const Outer =(props:{children:Preact.VNode})=>
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{
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const binding = React.useState(11);
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return <CTXState.Provider value={binding}>
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{props.children}
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</CTXState.Provider>
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};
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const Inner =()=>
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{
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const [stateGet, stateSet] = React.useContext(CTXState) || ["default", ()=>{}];
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return <button onClick={e=>stateSet((old)=>old+1)}>count: {stateGet} :)</button>
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};
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type Store = {name:string, age:number}
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const reducer =(inState:Store, inAction:number)=>
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{
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return {...inState, age:inState.age+inAction};
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}
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export default ()=>
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{
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const [Store, Dispatch] = React.useReducer(reducer, {name:"seth", age:24} as Store)
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return <CTXString.Provider value="intradestink">
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<div>
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<h1>Title!</h1>
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<h2>subtitle!</h2>
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<p>
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<button onClick={e=>Dispatch(1)}>{Store.name}|{Store.age}?</button>
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</p>
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</div>
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<Outer>
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<Inner/>
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</Outer>
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<Outer>
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<Inner/>
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</Outer>
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</CTXString.Provider>
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} |