n/prefer-promises/dns

📝 Enforce require("dns").promises.

Since Node.js v11.14.0, require("dns").promises API has been stable. Promise API and async/await syntax will make code more readable than callback API.

📖 Rule Details

This rule disallows callback API in favor of promise API.

Examples of 👎 incorrect code for this rule:

/*eslint n/prefer-promises/dns: [error]*/
const dns = require("dns")

function lookup(hostname) {
    dns.lookup(hostname, (error, address, family) => {
        //...
    })
}

/*eslint n/prefer-promises/dns: [error]*/
import dns from "dns"

function lookup(hostname) {
    dns.lookup(hostname, (error, address, family) => {
        //...
    })
}

Examples of 👍 correct code for this rule:

/*eslint n/prefer-promises/dns: [error]*/
const { promises: dns } = require("dns")

async function lookup(hostname) {
    const { address, family } = await dns.lookup(hostname)
    //...
}

/*eslint n/prefer-promises/dns: [error]*/
import { promises as dns } from "dns"

async function lookup(hostname) {
    const { address, family } = await dns.lookup(hostname)
    //...
}

🔎 Implementation

• Rule source
• Test source