All files buffer-writable.js

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const { Writable } = require('node:stream');
 
class BufferWritable extends Writable {
  #buf;
 
  constructor(options) {
    super(options);
    this.#buf = [];
    this.buffer = null;
  }
 
  _write(chunk, encoding, callback) {
    this.#buf.push(chunk);
    callback();
  }
 
  _final(callback) {
    this.buffer = Buffer.concat(this.#buf);
    callback();
  }
}
 
module.exports = BufferWritable;