我正在尝试编写一个仅在需要时返回自定义承诺的函数。代码如下所示：
$name = $sp->find('h3', 1)->find('a', 1)->innertext;
我知道我可以将整个函数包装在login(sp: ServerProfile): Promise<any> {
return this.logout(sp) // first logout
.then(_ => {
if (this.isAuthEnabled(sp)) {
return this._login(sp) // if yes, re-login
.then(succ => { this.utils.debug(`Logged in with: ${succ}`); this._isLoggedIn = true; })
}
else {
this._isLoggedIn = true;
return new Promise ( (resolve, reject ) => {resolve(true)}) //-> problem
}
})
}
中，但我不想在返回承诺时不必要地包裹new Promise (resolve, reject)。
如果我在this._login部分添加new Promise，我会收到此错误：
[ts]类型的参数＆＃39;（_：any）=＆gt;承诺|无极＆LT; {}＆GT;＆＃39;不是 可分配给＆＃39;（value：any）=＆gt;类型的参数无效| PromiseLike＆＃39;
答案 0 :(得分：0)
啊，解决方案似乎是在手工制作的承诺中指定componentDidMount() {
this.props.data.subscribeToMore({
document: OrderSubscription,
variables: {
range: [0, 25]
},
updateQuery: (prev, { subscriptionData, }) => {
// If no subscription data is passed, just return the previous
// result from the initial `orders` query
if (!subscriptionData.data) return prev
// get the data for the updated order from the subscription
const updatedOrder = subscriptionData.data.orderChanged
// find the index of the updated order from within the existing
// array of orders from the `orders` query
const existingOrderIndex = prev.orders.findIndex(order => (order.id === updatedOrder.id))
// guard for missing data
if (existingOrderIndex) {
// replace the old order with the updated order
prev[existingOrderIndex] = updatedOrder
// return orders with new, updated data
return prev
}
return prev
},
})
}
<any>