node/prefer-promises/fs

enforce require("fs").promises

Since Node.js v11.14.0, require("fs").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 :-1: incorrect code for this rule:

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

function readData(filePath) {
    fs.readFile(filePath, "utf8", (error, content) => {
        //...
    })
}

/*eslint node/prefer-promises/fs: [error]*/
import fs from "fs"

function readData(filePath) {
    fs.readFile(filePath, "utf8", (error, content) => {
        //...
    })
}

Examples of :+1: correct code for this rule:

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

async function readData(filePath) {
    const content = await fs.readFile(filePath, "utf8")
    //...
}

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

async function readData(filePath) {
    const content = await fs.readFile(filePath, "utf8")
    //...
}

🔎 Implementation

• Rule source
• Test source