The no-unnecessary-polyfills rule complains about usage of promise.withresolvers package on Node.js 20 even though the native Promise.withResolvers is not available. According to MDN, it is only available since Node 22.0.0.

no-unnecessary-polyfills

Here's my rule config:

"unicorn/no-unnecessary-polyfills": [
    "error",
    { targets: "node 20.15.0" },
],

Here's the engines part on package.json:

    "engines": {
        "node": "^20.15.0",
        "pnpm": "^9.4.0"
    },

And there's a piece of code that triggers an error.

import withResolvers from "promise.withresolvers"; // Use built-in instead. eslint (unicorn/no-unnecessary-polyfills)