react 报错Assign arrow function to a variable before exporting as module default

警告代码：

const defaultState = {mykey: 1
}export default (state=defaultState, action) => {let newState = JSON.parse(JSON.stringify(state))switch(action.type){case "addKeyFn":newState.mykey++;break;default:break;}return newState;
}

这样写会报警告：

修改为：

const reducerState = (state=defaultState, action) =>{let newState = JSON.parse(JSON.stringify(state))switch(action.type){case "addKeyFn":newState.mykey++;break;default:break;}return newState;
}export default reducerState

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react 报错Assign arrow function to a variable before exporting as module default

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