node.js - TypeScript 编译 node-postgres 的问题

Question

免责声明，我对 TypeScript 还很陌生，所以这可能是一个愚蠢的问题!

我正在尝试对我的 Express/Postgres 应用程序使用与 node-postgres docs 中所述相同的设置。 ，我有一个连接到 PostgreSQL 服务器的模块，并且包含在我需要访问它的任何地方，但是我在使用 TypeScript 的类型时遇到了一些问题。

对于这个例子，我将所有内容都简化为完全删除 Express。如果我这样做，一切正常，TypeScript 的编译器很高兴:

import { Pool } from 'pg';

const pool = new Pool({
    host: process.env.PG_HOST,
    port: parseInt(process.env.PG_PORT),
    user: process.env.PG_USER,
    password: process.env.PG_PASSWORD,
    database: process.env.PG_DATABASE,
});

(async function getRows() {
    const result = await pool.query('SELECT id, message, created FROM media');

    interface dbObject {
        id: number,
        message: string,
        created: Date
    }
    await result.rows.map((row: dbObject) => {
        console.log(row.id);
        console.log(row.message);
        console.log(row.created);
    })
})()

但是，如果我移动 pg db.ts 独立的函数模块:

import { Pool } from 'pg';

const pool = new Pool({
    host: process.env.PG_HOST,
    port: parseInt(process.env.PG_PORT),
    user: process.env.PG_USER,
    password: process.env.PG_PASSWORD,
    database: process.env.PG_DATABASE,
});

export = {
    query: (text, params) => pool.query(text, params),
}

并将其导入到主 app.ts文件:

import database from './db';

(async function getRows() {
    const result = await database.query('SELECT id, message, created FROM media', []);

    interface dbObject {
        id: number,
        message: string,
        created: Date
    }
    await result.rows.map((row: dbObject) => {
        console.log(row.id);
        console.log(row.message);
        console.log(row.created);
    })
})()

我收到几个投诉:

src/app.ts:11:27 - error TS2345: Argument of type '(row: dbObject) => void' is not assignable to parameter of type '(value: any[], index: number, array: any[][]) => void'.
  Types of parameters 'row' and 'value' are incompatible.
    Type 'any[]' is missing the following properties from type 'dbObject': id, message, created

11     await result.rows.map((row: dbObject) => {
                             ~~~~~~~~~~~~~~~~~~~~


Found 1 error.

我意识到这很可能是因为我没有将任何类型添加到 query我的 db.ts 中的函数文件，但我实际上也不知道如何正确添加它们以使这一切正常工作!

Answer 1

好吧，这似乎有效!我刚改了db.ts导出pool直接地:

import { Pool } from 'pg';

const pool = new Pool({
    host: process.env.PG_HOST,
    port: parseInt(process.env.PG_PORT),
    user: process.env.PG_USER,
    password: process.env.PG_PASSWORD,
    database: process.env.PG_DATABASE,
});

export = pool;