[英]Type 'Promise<void>' is missing the following properties from type
[英]Type 'Promise<ConnectionPool> & void' is missing the following properties from type 'ConnectionPool'
我正在嘗試建立連接並使用 mssql package 返回池。
const sqlConfig = {
user: process.env.DB_USER,
password: process.env.DB_PASS,
database: process.env.DB_CATALOG,
server: process.env.SERVER_HOST
}
export async function connect(){
try{
const pool = await sql.connect(sqlConfig)
return pool
}catch(err){
throw err
}
}
但是,當返回池時,我收到以下 lint 錯誤: Type 'Promise<ConnectionPool> & void' is missing the following properties from type 'ConnectionPool': connected, connecting, healthy, driver, and 26 more.
我應該如何重寫代碼以將池作為 ConnectionPool 而不是 Promise<ConnectionPool> & void 返回?
作為參考,這里是完整的代碼:
import sql, { ConnectionPool } from "mssql"
require('dotenv').config()
const sqlConfig = {
user: process.env.DB_USER,
password: process.env.DB_PASS,
database: process.env.DB_CATALOG,
server: process.env.SERVER_HOST
}
export async function connect():Promise<ConnectionPool>{
try{
const pool = await sql.connect(sqlConfig)
return pool
}catch(err){
throw err
}
}
我嘗試將變量轉換為 ConnectionPool 並顯式寫入預期的返回值,如下所示:
export async function connect():Promise<ConnectionPool>{
try{
const pool = await sql.connect(sqlConfig)
return pool as ConnectionPool
}catch(err){
throw err
}
}
我還嘗試向來自https://github.com/tediousjs/node-mssql/issues/1063的 @types/mssql package 添加重載,盡管這是一篇較舊的帖子。
您正在等待 promise 將返回值視為 ConnectionPool object 而不是 promise。
如果您希望連接返回連接池,請將返回類型更改為 ConnectionPool,如果您仍希望它返回 promise,請刪除 await,如下所示,並使用 await 調用您的連接 function
export async function connect():Promise<ConnectionPool>{
return sql.connect(sqlConfig);
}catch(err){
throw err
}
}
然后用await connect()
或調用它
connect().then( (pool ) => {
// Do something with pool here
}
我會建議 the.then 而不是 await
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