Homebrew auto-updates mongosh users to the latest Node.js version. Node.js 23 supports require() for ESM modules, but prints a warning about it.

https://github.com/mongodb-js/devtools-shared/blob/7aeaac8a2ce1fbfea381d93520544919fc4f59b9/packages/devtools-proxy-support/src/fetch.ts#L20

attempts to load node-fetch first via plain import(), which gets transpiled to require() (so that it works fine in webpack'ed applications), which failed in non-webpack'ed environments before Node.js 23 but now succeeds with the warning.