Dispose Pattern (ARCH3082)

Key typescript.performance.dispose-pattern · Severity warning · Category performance

If a class holds closeable/disposable fields but does not implement the cleanup contract, the resources it owns are never released.

Incorrect

class Logger {
  private stream = fs.createWriteStream("log.txt");

  write(msg: string): void {
    this.stream.write(msg);
  }
  // no dispose - stream leaks
}

Correct

class Logger implements Disposable {
  private stream = fs.createWriteStream("log.txt");

  write(msg: string): void {
    this.stream.write(msg);
  }

  [Symbol.dispose](): void {
    this.stream.close();
  }
}

Fix

Implement the cleanup contract (Disposable) on classes holding closeable fields and release the owned resources.