$ npm install strip-bom-streamStrip UTF-8 byte order mark (BOM) from a stream
From Wikipedia:
The Unicode Standard permits the BOM in UTF-8, but does not require nor recommend its use. Byte order has no meaning in UTF-8.
$ npm install strip-bom-stream
import fs from 'node:fs';
import stripBomStream from 'strip-bom-stream';
fs.createReadStream('unicorn.txt')
.pipe(stripBomStream())
.pipe(fs.createWriteStream('unicorn.txt'));
It's a Transform stream.