no-unsupported-features/node-builtins does not check for fs/promises

[jordanbtucker]

The original way to import the fs Promises API was via one of these options:

const fsp = require('fs').promises
const {readdir} = require('fs').promises
const {promises: fsp} = require('fs')
const {promises: {readdir}} = require('fs')
import {promises as fsp} from 'fs'
// No way to import `readdir` directly via ES modules.

In Node.js v14, they added the ability to import the fs Promises API via fs/promises so you can do things like:

const fsp = require('fs/promises')
const {readdir} = require('fs/promises')
import fsp from 'fs/promises'
import {readdir} from 'fs/promises'

eslint-plugin-node doesn't seem to check to make sure that fs/promises is available in the supported versions of Node.js listed in package.json.

[thernstig]

'fs/promises' is also actually the first method list since Node.js 15 and forward, so it should get larger adoption as time goes, see https://nodejs.org/api/fs.html#fs_promises_api

https://github.com/mysticatea/eslint-plugin-node#readme should then probably get an update for node/prefer-promises/fs to also say `enforce require("fs/promises"). Or is that also not supported and should be a separate issue?

[jordanbtucker]

@thernstig, that is a good idea, and it should probably be a separate issue. 👍

[thernstig]

@thernstig, that is a good idea, and it should probably be a separate issue. 👍

Done: #260

[sosukesuzuki]

Maybe this is fixed in #261