如何使用useState声明一个字符串数组，然后在使用Typescript时更新？

Question

I have the following

interface ISTx {
    tx: Array<string>,
    setTx: any
}

const [tx, setTx]  = useState<ISTx>([]) //Argument of type 'never[]' is not assignable to parameter of type 'ISTx

setTx(oldArr  => [...oldArr , txHash]) //Argument of type '(oldArr: ISTx) => any[]' is not assignable to parameter of type 'SetStateAction<ISTx>

But im receiving the errors that are commented in the blockcode above.

Im basically trying to create a state that is an array of strings, and push new strings into it.

Answer 1

const [tx, setTx] = useState<string[]>([]);

You declare the type of your state between the angled brackets (<>). React will provide the necessary types for tx and setTx .