Adapts anything with a write(string) — a node:fs stream, a socket, an array-backed fake — into a Console. stderr defaults to stdout, so one stream collects the whole run.

import { streamConsole } from './console.ts';

const chunks: string[] = [];
streamConsole({ write: (text: string) => void chunks.push(text) }).error('# warning\n');
chunks; // ['# warning\n'] — with no stderr given, both channels land in the one stream